BUILD YOUR LITERATURE

BUILD YOUR

LITERATUREFILE

See page 30

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IRC 442 PW7 7W,CO0 ft 10%

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TECHNIC!& Circuit Digest.

TELEVISION ELECTRONIC RADIO AUD:,.. SERt ICE

M. CLEMENTS Publisher

0. H. CALDWELL Editorial Consultant

ALBERT J. FORMAN Editor

SIDNEY C. SILVER Managing Editor

S. TANHAUSER Assistant Editor

J. L. STOUTENBURGH Contributing Editor

CHARLES F. DREYER Art Director

ELMER KETTERER Circuit -Digest Production

GEORGE FUGLICI Circuit Diagrams

BUSINESS DEPARTMENT

H. A. REED V.P. & General Sales Manager

BERNARD BLOCK District Manager

MARSHALL FAILLACE District Manager

P. J. CARNESE Sales Promotion Manager

N. McALLISTER Asst. Business Manager

W. TAYLOR Production Manager

A. H. POND Controller

W. W. SWIGERT Credit Manager

ELMER DALTON Circulation Manager

480 Lexington Ave., New York 17, N. Y.

Telephone PLaza 9.780

P. H. DEMPERS Distract Manager

201 N. Wells St., Chicago 6, III.

Telephone RAndolph 6-9225

CHRIS DUNKLE & ASSOCIATES

California Representative3257 W. 6th Street, Los Angeles 5, Calif.

Telephone DUnki k 7-6149

3077 Turk St., San Francisco 18, Calif.Telephone EXbro&c 2-0377

u, -

TECHNICIAN & CIRCUIT DIGESTS, Mor.1956, Vol. 63, No. 3, 5.50 a copy. Pub-

lished monthly by Cardwell -Clements, Inc.Publishers also of MART including Price -Fax.",Publication office, Emmett St., Bristol, Conn'.Editorial, advertising and executive offices,480 Lexington Avenue, New York 17. Title -phone PLaza 9-7880. M. Clements, PPesi-

dent; M. H. Newton, Assistant to President;John J. Borghi, Vice President and Treas-urer; M. B. Clements, Secretary/ '

Entered as second class matter at the PostOffice at Bristol, Conn., June 10, 1954.

Subscription rates: United States and Can-ada, 54.00 for one year; 56.00 for twoyears; 58.00 for three years. Pan-Americanand foreign countries: $7.00 for one year;510.00 for two years; $14.00 for three

years. Copyright 1956 by Caldwell -

Clements, Inc., New York. Title registeredin U. S. Patent Office. Reproduction or

reprinting prohibited except by writtenoJthorization of publisher. Printed in U.S A.by Hildreth Press, Inc., Bristol, Conn.

MARCH,

FRONT COVER Servicing aids and references printed oycorrespondence courses, contain valuable data to speed -er .

Lure items are described on pages 30-39, and may be obtc,little cr no charge simply by filling out the postage -free ing,your efficiency-build your literature file now!

FEATURES and ARTICLES

Servicing at Your Fingertips; Phony"Tuning in the Picture"Grounds that are Not GroundsTest Instruments for Color ServiceBuild Your Literature FileTwo -Way Radio Systems"Tough Dog" CornTape Recorder Case Bi..ok"Phantom" Antenna )r Blocked Reception . James A. McRoberts

Let's Look at CircuitsShop HintsLatest Test InstrumentsNew Antennas & AccessoriesNew Tubes & ComponentsColor TV in Mcss ProductionSolonium Rowe.. 4i "Goofometer"36 -Hr. Weelt Co; ieckniciansIdea:: !or Test Equipment

a ab...1 AIM. 'CM'

as cal'red. iitero-

'f_i;,,J re; tiers at

or prit.le 33. Improve

Products (Editorial! .3

A. R. Clc v3C n'

C MfciLlleic

4lack Darr

E Hollembr F. Bol:e, E. Townsend

James Grafton

DEPARTMENTS

Sidney C. Silv-r

LOMber L. Williams, E. Bell, W. Beasley

Lette's to the Editor 4 Association News

Editor's Memo 16 News of the Industry

Calendar cf Coin;,g events . 25 Reps & Distributors

New Products 46 Catalogs & Bulletins

New Books 65

CIRCUIT DIGESTS

ALIGNMENT ni'N't tura ...ne creart r2 Co7ncl s,...- I ,.. .klid,rtst and sopot dle ,-. ,

'" - Mnr:. . "" 0 6-45PIA: :::::=tr.z. @/7111"2e7 C....rorel oseillosens I , Kaiiii '-' It..,..L Admasi rresinulg Um , -.1LAT/... ......

seems*. thl, tt Is . . .4. Da ....

PARTS LIST 1, :71 t.'fi 6- -...

10

404i424314

45

4748

50

5255

58

66

59

2

63

133

75

IN THIS ISSUE:CBS -COLUMBIA: TV Chassis 31r', 3002,

3003, 3012, 3013, 3015CROSLEY: Clock Radio Chassi- R103MOTOROLA: TV Chassis 15-5;s4, TS -534YRCA -VICTOR: Clock TV Cho-i. wC5101,

KCSIO1ATRUETONE: TV Models 2 5

2D1636A, 2D2634AZENITH: AM -FM Receive. Y02

ONLY

:r"Lofton. .IS

PICTURE TUBES .

LCORONA INHIBITOR\NI

Uk

This Raytheon development insuresbrightness rain or shine. Ordinary

tubes lose up to 10% of their brightness on humid, damp days.Not so, Raytheon Picture Tubes. Tests prove no loss of brightnesseven under a water spray on the high voltage contact - thanksto Corona Inhibitor.

CROSS-CHECK CONTROLtilt, r WAG.,

j.rz

n. -.sit.. howl

Raytheon Picture Tubes are rightwhen you get them, thanks to

RAYTHEON'S CROSS-CHECK QUALITY CONTROL. Thiscomprehensive Raytheon quality control method includes dailytests made on tubes for pressure, base torque and outside coat-ing adhesion. Engineering controls check screen color andbrightness and tube life under both ideal and extremely adverseconditions. And, most important of all, a substantial percentageof every day's production is actually unpacked and retested forphysical appearance and electrical characteristics before qualitycontrol headquarters will permit release of a single tube forshipment.

The largest exhaust machine inthe world - shown in the back-ground - holds 120 24 inchtubes in its oven at one time.Each tube travels 280 feet in-side the oven.

Hal !Fig'

Goiwt Me test racks constantlycheck end vaatti the quality and

per Were acce of Raytheon

.4

Raytheon Picture Tubes are *carefully baked out, here, in thelargest oven of its kind evermade.

Circle numk-erc free Inquiry cord, p. 33, for more product data.

iiiiitry

eon Picture Tubes have the distill

Cathode Ray Tube Plant in Quincy, Mass.houses some of the world's largest equip-ment mid was designed and built solely forthe manufacture of today's large screenRaytheon Picture Tubes.

TECHNICIAN March, 1956

a

aa

a

. give you these major advantages

ALUMINIZEDwith

rt,rakt.c)LUMILAC -- a lacquer especially blendeciand used exclusively by Raytheon - is thesecret of the superiority of Raytheon Alumi-nized Picture Tubes. This amazing lacquerproduces an extra smooth, unbroken surfacefor the pure aluminum coating, yet leaves nogas -producing residues which could impaircathode emission and shorten tube life.

The result all the benefits of alumi-nized tubes, sharper picture, supe-

rior contrast, high light output--- plus excellent tube fife.

:12 am eMilomm we else meet

BIM iiiii MIMI MOlull lull

0 ,lt

C'4.° ,.,

116RAYTHEON MANUFACTURING COMPANY

Receiving and Cathode Ray Tube Operaions

Newton, Mass. Chicago Atlanta, Ga. Los Angeles, Calif.

Raytheon males Receiving and Picture Tubes, Reliable Subminiature and Miniature Tubes. Semicon -

all these ductor Diodes, Power Itectifiers and Transistors, Nucleonic tubes. Microwave Tubes

RAYTHEONH)

afireeilAnCe elecluvriels

TECHNICIAN March, 1936Circle numbers on free inquiry card, p. 33, Inr r pooduct data.

Complete SERVICE DATAat unbelievably

LOW COST!Rider Mo,luals-The only fully field-tested, factory -approved service data-is avail-

able to you art an incredible per -chassis cost of 8c . At a per -model cost of only

2 CI

TV 17 IS READY !LIMITED PRINTING-GET YOUR COPY NOW.

o Completely current with receiver production.o Complete 1958 lines of RCA, Philco, Admiral, etc.

All production runs and changes.o Over 35 manufacturers covered.o Coverage: August 1955 -December 1955.o Latest 21" Color TV. Really COMPLETE servicing information. ONLY $424.00

FACTORY SKILL and FACTORY KNOWLEDGE become yours whenyour service information source is Rider Manuals . . . Not only do youget most for your money - but you get information which covers allthe production runs that may cgme to your bench.

RIDER'S SPECIALIZED HOME 8.

PORTABLE RADIO MANUALS

The most accurate-and profitable!--sers ireinformation you ran buy: Fully approved andauthorised by the manufacturers. Data in-cludes: schematics. tube layouts, voltagecharts, alignment data, cabinet pictures, dialstringing, trimmer locations, chassis views,parts lists, etc. Soft Covers, 81,4 x 11".

#4001: Admiral, Allied, ArvinAutomatic. Bend's Only $1.65

#4002: Bogen, CRS -Columbia,Capehart-Farnsworth, Crosley. Only $1.65

#4003: DeWald. Emerson, Fads,Firestone Only $1.65

#4004: Gamble Skogmo, GE.Goodrich, HIllerafters, Jackson Only $1.65

#4005: Jewel, Magnavox, Meek.Mitchell. Montgomery Ward Only $1.65

#4006: Motorola, Olympic, Pack-ard Bell Only $1.65#4007: Phileo Only $2.40#4008: RCA Only $1.65

#4009: Radio Craftsman, Ray-theon, Sears Roebuck. Sen-tinel, Setchell. Carlson. Son-ora, Spartan Only $1.$$

424010: Spiegel. Stewart -Warner,Stromberg Carlson. Sylvania,Tele-King, Traveler Only $1.65#4011: Sells Gardner, WesternAuto. Westinghouse, Zenith Only $1.65

RIDER'S SPECIALIZED HI-FI AM -FM

TUNER MANUAL

An informative, factory -accurate manual coveringthe 20 MOO popular brands of AM or FM hi-fituners made between 1950 and 1955. Gives youcomparative specifications, characteristics, all in-formation on adjustments and servicing, etc. Soft(.over. 192 pp., 8% x 11", Wen. #7001....83.50

TV FIELD SERVICE MANUALS:

WITH TUBE LOCATIONS

edited by Harold AlsbergA practical Nerlo, of why location handbook.,plus discussion of trouble symptoms. adjust-ments, etc. Each volume has 7 years coverage,starting with 1947. Soft Cover, spiral binding.51,4 a 81/2" illus.Vol. 1: Covers sets by Admiral, Affiliated Re-

tailers (Artone), Aimee., (AMC), AirKing, Air Marshall, Allied Purchasing,Andrea. Arvin, Automatic.

#155 Only $2.10Vol. 2: Covers Bendia, Capehart, CBS-

1:olumbia, Croaky, Dumont.#155-2 Only 82.40Vol. 3: Covers Emerson, Facia.#155-3 Only $2.10Vol. 4: Covers GE, Hallierafters, Hoffman.#155.4 Only $2.40Vol. 5: Covers Motorola. Philee#155-5 Only $2.40

RIDER MANUALS

AND THE FAMOUS

LINE OF

ECONOMICAL RIDER

BOOKS ARE

AVAILABLE AT YOUR

PARTS ")BEER.

LOOK FOR THE

RIDER BOOKSELLER.

FREE CATALOG ON REQUEST

If your jobber does not seU Rider Manuals order them from us.

JOHN F. RIDER PUBLISHER, INC.480 Cana) Streets, New York 13, N. Y.

In Canada.Charles W. Po inton, ltd.

6 Aircio Ave., Toronto, Ontarioopproo. 5% higher.

LETTERSTo the Editor

Overpriced Testers?Editor, TECHNICIAN:

In entering your Test EquipmentContest, technician John Holland and Istated "no value" for CRT and flybacktesters. Here's why. CRT testers on themarket today are way overpriced. Afilament transformer, double -pole 4 -position switch, NE 51 indicator, socket,leads and a few resistors are all oneneeds. As to the flyback checker, if theshop is going to spend $50, it would bebetter to spend it on a good audio gen-erator with range to 200 kc. With suchan instrument and a scope or ac vtvm,any flyback can be checked. Most ofthem are designed to resonate between50 and 75 kc (with yoke connected,width coil disconnected; flyback aloneis 25 to 50 kc). If the resonant frequencyis higher, as seen on the scope, then theflyback has shorted turns. An ohmmeterwill check for opens.

H. M. LAYDENChief Technician

Judd -Bennett Co.New York, N. Y.

As we noted in our Feb. 1956 issue,p. 22, many technician contest entrantsdon't agree. CRT and flyback testershad high importance ratings. It's not aquestion of right or wrong. Rather itdepends on personal preference, in-genuity and shop techniques.-Ed.

Part Time SupportEditor, TECHNICIAN:

Let's see a bit of credit for the smallor part time operator who is trying todo an honest job. Many times it is hewho spends many hours to repairequipment which the big shops won'ttouch. We need the little beginner, thenight crawler and the independentdealer. Without them we will have noreplacements for men now working, andan insufficient number in case of emer-gency.

PAUL N. SMITHUrbana, Ill.

Pricing Repair JobsEditor, TECHNICIAN:

Our TV department would like tohave a list of prices for various repairjobs. For example, replacing picturetubes, checking tubes in set, etc. Canyou help?

WILLARD J. GRABENHutchinson, Kansa;

Coming up! We're just completing anindustry -wide survey on prices techscharge for various jobs. Report will bepublished in TECHNICIAN as soon asour statistical department finishes itswork.-Ed.

(Continued on page 20)4 c. -ete nu.nbws on free inqu.:y co.d p 33, for more product data.


The QUALITY! BEAUTY! PRECISION!

Clhompson Products

AuE.LEcT" Superoitsr

For accuracy, dependability, and ease of control, the new Elec-

tronic Automatic Superotor is years ahead of any other antenna

rotator on the market. Electronic VP' Tuning, completely silent oper-

ation, and smooth, even rotation combine to bring you instantly,

automatically, the finest TV picture you've ever enjoyed.° Vernier Precision

OTHER THOMPSON PRODUCTSELECTRONIC AFFILIATES

Bell Sound Systems Doge

Television RamoWooldridge Corp.Pacific Semi -Conductors, Inc.

INTERCHANGEABLE ROTATORS

Famous Superotor models "100"and "500" have both been designedfor cu'omatic operation.

ELECTRONICS DIVISIONclhompson Products, Inc. (#)

2196 CLARKWOOD ROAD CLEVELAND 3, OHi)Available in Canada thru Atlas Radio Corp., Lid., 50 Wingcld Ave., Toronto

TECHNICIAN March, 1956Circle numbers on free inquiry cord, p. 33, for n p oduct 5

Dealers by the thousands are

making the NINGto this great insulator idea!

when we say

we mean

business!

WA' -

NewNew indoor antenna has

gliding 6wicifc-ACop -right 1956, Channel Mostar Corp

Only CHANNEL MASTER' Millions already sold!Here's why:

insulators

have this revolutionary

2 in 1 designIt's a wood -screw insulator

... it's a machine -screw insulator

... and it's BETTER in both applications!

STANDOUT insulators and buckles are already outsellingall others - after only a few months on the market! Thisremarkable record provides positive proof of the solid ac-ceptance STANDOUTs have won among dealers all overthe country.

Why has the response to STANDOUTs been so enthusi-astic? BECAUSE they cut space and dollar investments inaccessories by more than 65% ... BECAUSE they increasespace and dollar turnover by more than 200% ... BECAUSEthey are easier to install, stronger, more durable.

"T-Ntt" bucklewith 8 threads.

More threads thanany other buckle (nuttype or extruded) -8 Lill machinedthre.zds1 Tighten as

hard as you want,you can't strip itf

Pointed Screw makespositive contact.

St ap won't slip whileyou're tightening.Won't twist or slip onmast after installation. Straps have con-v3nient "taper -tip."

Needle-sharp pointFiner thread, sharperpoint means easierstarting - even in

hardwood. Minimizespossibility of splitting.

Ordinary standoff point.

"4140 ....... 111,...4 /\14\1\1101'\'\1\1.1\111\'.

STANDOUT point.

All popular types and sizes available, including

full assortment of specialized hardware.

See your Channel Most,.r distributor

CHANNEL MASTER'S

new ale-o-MatiCINDOOR TV ANTENNA

The Glide-o-Matic's sensational low -loss gliding switchis different from all others! Provides highest electrical effi-

ciency ... AND - it's the most convenient to operate!

Glide-o-Matic also gives you:

Maximum performance on all cnannels- VHF and UHF.

Weighted tip -proof base - with "can't scratch" feltcovering.

Ready for COLOR TV.

Powerful retail merchandising support.

Available in

4popular colorharmonies:

ilb-ies.fte I OM 0..

Mahogany with brass l model no. 3700

Ebony with brass I model no. 3701

Ivory

Ebony

with brass I model no. 3702

with aluminum I model no. 3703

A performance hit

with men ...

A style hit withwomen!

Glide-o-Maticpractically sellsitself. Smartlystyled ... blendsinto any setting.Packed in colorful"tell and sell" car-ton with convenient'carry away" handle.

$9.95list

Also available:

CHANNEL MASTERS ALL -VUmode/ no. 381, 011 -VHF, all UHF.

CHANNEL MASTER'S PRE -VUmodel no. 380 all -channel VHF.

$815

1111

CHAN 111fpfN11#41111411

2:EWffele'S IAIIIIST NIANVIACTUIII 0/ TV ANTINNAS AND ACCISSOIITS

Consider OAIIV............................ ...... . . PERFECT

REPLACEMENT................................... .....

when original quality disappearsWhen the original goes, the substitute shouldbe a Perfect Replacement. Ordinarily there is onlyone perfect replacement-something that looks andworks as good as the original when new-or better.When the original picture tube goes, the perfectreplacement is a Du Mont Twin-Screen Hi-Lite°The set will sparkle with new picture life ... you'llhave "new set quality-or better. A Du MontTwin -Screen Hi-Lite picture tube replacesage with "like new" performance.*the ultimate in aluminized picture tubes.

DU MONT°

PicturIftLITE

e Tubes

.

CATHODE-RAY TUBE DIVISION, ALLEN B. DU MONT LABORATORIES, INC., CLIFTON, N. J.

8 Circle numbers on free inquiry card, p. 33, for more product data.TECHNICIAN March, 1956

New Motorola®

Yt16,a713a1(°°Wr?RE°vvCar Radio

Tinytransistorreplaces15 vital

car radioparts

WITH A "GOLDEN HEART

THAT WON'T WEAR OUT"

Most trouble -free car radio everbuilt-The amazing transistor heart won'tever wear out. And it replaces 15 parts thatdo wear out in conventional sets. (Including thevibrator and vacuum tubes.)Cuts battery drain 50%-Transistors use hardlyany power. Even with the engine off, this radio

can play for hours without running down the

battery.Fits most cars-Custom fits instrument panelsof most cars. Takes just a few minutes to put in.(Or, Motorola's Installation Depot can do it foryou, in most cities).

El MOTOROLAWorld's Largest Exclusive Electronics Manufacturer

Motorola Transistor- PoweredCar Radio. (Model ETAS -8,12 volt) $99.95. Other newmodels from $39.95.

Now's the time to get intothe plc's -profit car radio business

Every fourth car lacks a radio. Car radio sales areup 30% . . . and still rising. And now, here's thehottest car radio ever developed. Backed by adver-tising in Reader's Digest (reaching every thirdperson in America). Get the extra profit waitingfor you in the car radio business. Send us thiscoupon now. No obligation.

r Motorola, Inc., Dept. T-34545 W. Augusta Blvd.Chicago 51, IllinoisAttn: Car Radio DepartmentPlease give me all facts about the Motorola CarRadio business. Thank you.

NameFirmStreet City State

L

1

J

TECHNICIAN March, 1956Circle numbers on free Inquiry card, p. 33, for snore product data. 9

COLORS

100% response at3.58 mc colorburst!

MODEL 458$22995 .comptletecabie withandshieldedmanual

DUAL BANDWIDTH-NARROW OR WIDECompare the new Simpson Colorscope Model 458 with any oscilloscope

on the market. It is an advanced, seven-inch, high -gain, wide -band scopeespecially designed for color -TV service. ( Ideal for black and white, too.)A big feature of the Model 458 is its flat frequency response-within 1 dbto 4.5 mc! With its accessory probes, Model 458 can do more color -TVtesting jobs than any scope in its price range.

ADDITIONAL FEATURES Dual bandwidth providesextra

testing versatility. Properly compensated wide

band vertical amplifier stages. High sensitivity and very good

transient response. Compensated step attenuator. Vernier vertical attenuator for

continuous control of the signalvoltage.

CRT balanced deflection. Excellent square wave response. Very small loading of circuit

being checked.

"Tilt" and "Overshoot" care-fully checked and minimized.

Very stable sweep and syn-chronizing circuits.

ACCESSORY PROBESVoltage Doubler, No. 740. 110.95Low Capacitance (input imped-

ance of 10 megohms shunted byonly 14 mmf ), No. 741 . . $9.95

100:1 Voltage Divider, No742 $9.95

Direct -Resistive Dual Purpose,No. 743 $9.95

See Your Electronics Ports Distributor, or write

SIMPSON ELECTRIC COMPANYWORLD'S LARGEST MANUFACTURER OF ELECTRONIC TEST EQUIPMENT

5200 W. Kinzie St., Chicago 44, Illinois

Phone: EStebrook 9-1121In Canada: Bach -Simpson Ltd., London, Ontario

SPECIFICATIONSVERTICAL AMPLIFIER FREQUEN-CY RESPONSE-Wide band posi-tion: Flat within ± 1 db from 20

4.5 mc/sec; flat within ±2 db from 10 c/sec to 5.0 mc/sec.

Narrow band position: Flat with-in 1 db from 20 c/sec to 200kc/sec; flat within ± 2 db from 10c/sec to 300 kc/sec.RISE TIME-Less than 0.05 micro-second (wide band position).VERTICAL DEFLECTION SENSI-TIVITY-Wide band: 40 my R.M.S./inch minimum. Narrow band: 15 myR.M.S./inch minimum.

HORIZONTAL AMPLIFIER FRE-QUENCY RESPONSE-Flat within

1 db from 20 cycles/sec to 200kc/sec.

HORIZONTAL DEFLECTION SEN-SITIVITY-Horizontal input "Hi",115 millivolts R.M.S./inch minimum.Horizontal input "Low", 1.4 voltsR.M.S./inch minimum.VERTICAL INPUT IMPEDANCE-3.3 Megohms shunted by 20 mmf.HORIZONTAL INPUT IMPEDANCE1.1 Meg.LINEAR SWEEP OSCILLATOR-Saw tooth wave from 14 cycles/secto 250 kc/sec. Sixty -cycle sine wavealso provided.

INPUT CALIBRATION -18 VoltP -P test voltage available on panel.INTENSITY MODULATION - Pro-vision for internal, external and 60cycles.

10 Circle slumbers on free inquiry cord, p. 33, for more product data.TECHNICIAN March, 1956

Garry Mooresellsyourservicewhile he sellsCBS Tubes*

GYamauedk..13,1Lig

"NS 1.11.1.

*On the CBS Television Network.

"This portion of the Carry Moore Showis brought to you in behalf of radio andtelevision service -dealers who useand recommend CBS Tubes.

"That's the way you're introduced.Later, I focus right on you - like this:. . . television sets require trainedservice -dealers to keep them in goodcondition. And believe me, a qualifiedservice -dealer is a trained technician.He has spent a lot of time and effortstudying electronics, and a substantialamount of money for technical equirment.'

mill!1$1

ee See how CBS-HYTRON works side by sidewith you. The easy way for you to cash

in is to use and recommend CBS Tubes.

Because I keep reminding my listenersthere are no better tubes made thanCBS Tubes - and they have theGood Housekeeping Guaranty Seal.'

You'll build profitable customer confidence

and sales when you recommendCBS Tubes . . . the tubes with theGood Housekeeping Guaranty Seal.

r

GarryMoore

famous CBSTelevision Star

C15113-HVTRON, Danvers, Massachusetts . . . A DIVISION OF COLUMBIA BROADCASTING SYSTEM, INC.

TECHNICIAN March, 1956Circle numbers on free nquiry card, p. 33, for more product dote. 1,

-.11t. I

Completely AUTO-MATIC version ofthe TR-2 with allthe powerful fea-tures that made itfamous.

Pre -Sold to millions every week on TVThe Most Complete Line ... A Model for Every NeedSuperior Engineering ...they're Tried -Tested - Proven

Completely AUTO.MATIC rotor, pow-erful and depend-able. Modern de-sign cabinet. 4 wirecable.

Completely AUTO-MATIC rotor withthrust bearing.Handsome cabinet,4 wire cable.

CORNELL-DUBILIERSOUTH PLAINFIELD, N.J.

TR-2

Heavy-duty rotorwith plastic cabinet.'compass control"illuminated perfectpattern dial, 8 wirecable.

Heavy-duty rotor,modern cabinetwith METER con-trol dial, 4 wirecable.

Combination vilue.complete rotor

with thrust bearing.Modern cabinetwith meter controldial, uses 4 wirecable.

THE RADIARTcoRe.CLEVELAND 13, OHIO

TR-11

Ideal budget all-purpose rotor, newmodern cabinetfeaturing metercontrol dial, 4 wireCable.


SYLVAA IA

6SN7GTBELECTRONIC

TUBE

111

SUVA\ IA

6BQ6GTAELECTRONIC

TUBE

tr

"nor4111111

SYLVANIA

1B3GT

ELECTRONICTUBE

SYLVAA IA

6AU6ELECTRONIC

TUBE

'

ALVA\ IA

6CB6ELECTRONIC

TUBE

SYLVANIA

5U4GBELECTRONIC

TUBE

. .

IWV

so"r're

I -lo -vv- to getthe jump on call-backsin. 6 easy- movesHere are six tube types called for mostin your daily service work. Eliminate thecall-backs from these types and yourbiggest share of headaches is over. It'seasy to do just that, too, simply by gettinginto the habit of using only Sylvania tubes

... in the familiar yellow and black carton.

These 6 types alone incorporate over 14

design and production improvements toeliminate the most common causes for

"quick failures" and costly call-backs.It's no wonder more and more servicemenconsider the yellow and black cartontheir "calling card of top quality service."

r SYLVANIASYLVANIA ELECTRIC PRODUCTS INC.1740 Broadway, New York 19, N. Y.

In Canada: Sylvania Electric (Canada) Ltd.University Tower Building, Montreal

LIGHTING RADIO ELECTRONICS TELEVISION ATOMIC ENERGY

TECHNICIAN March, 1956Circle numbers on free inquiry card, p. 33, for mere product dol.

THIS IS THE GUN YOU ASKED FORBUILT TO SERVICE MAN'S SPECIFICATIONS

op/get, TO INCLUDE ALL THE BIG FEATURESEVERYBODY WANTS

HE tor( °u"MODEL288

LONGER REACH TIPS

LONGER LIFE TIPS

MORE RIGID TIPSLIGHTER WEIGHT -2s':, less than comparable products

SHATTER PROOF CASEYour No. I Gun-ideal for the kind of work you do-and itSHOULD be, because it was designed and built specifically tomeet the service man's requirements. Develops AMPLE heat-fast!Cools quickly too. Is so light, so beautifully balanced, the workgoes easier. And the long, narrow, rigid tips reach right into thosetight "inaccessible" places. Automatically spotlights its work.Fully guaranteed.

DEVELOPS OVER 200 WATTS HEAT

Quirk_Rot''

ELECTRONICSOLDERING

GUN

AT BETTER JOBBERS EVERYWHERE

WEN

INEdeeopta

JUST

$9,95t.,s,

PRODUCTS, INC.5808 NORTHWEST HIGHWAY CHICAGO 31, ILL.

Export so/es, Scheel Internaiional, Inc., Chicago


IA010.111011111110 102

gas., OSSINING NOVAS

Introducing the new champion . . .

RCA BATTERIES FOR TRANSISTORIZED RADIOS

Yes, the transistorized radio receiver is here to stay, and that means extra "transistor" battery business

for you. Folks like the new transistorized receivers because of their compact size, perfect portability and

economical use of battery power. They'll be taking these receivers everywhere. Be ready to fill "transistor"

battery needs. Only a few battery types to stock to fill virtually all of your requirements; very little

display space needed. In addition, RCA has a comprehensive line of batteries for all your portable needs.

And remember, the famous RCA name on a battery means a battery practically pre -sold.

RADIO BATTERIESRADIO CORPORATION OF AMERICA

TECHNICIAN March, 1956Circle numbers on free inquiry cord, p. 33, for more product data. 15

or)another

installation .

the beam .

with a iirrAIL IIE 111D

TRAPPERA job well done! You can guarantee the very best reception for

the customer, aid there'll be no costly call-backs or complaints,when you install one of the Taco family of Trapper antennas.

The Trappers will outperform and outlast all theother antennas i e neighborhood.

SUPERTRAPPER

Working elements-24 high bond and

7 low bard.Gain up to 12 DB on

high bond and9 DB on low bond.

TRAPPERROYAL

Working elements -IS iigh band and

5 low band.Gain up to 11 DB or,

nigh band and7t2 DE on low band.

TRAPPERWorking elements

-15 high band and5 low bond.

Gain up to 10 DB onhigh band and

7 DB on low band.

TRAPPER JR.Working element:

-7 high band and3 low band.

Gain up to 8 DB onhigh bond and

3 Ya DB on low band.

TECHNICAL APPLIANCE CORPORATION SHERBURNE, N. Y.In Conoco Hacibusrts Electronics. Toronto 4, Ont.

Editor's MemoUncle Sam's Federal Trade Commis-

sion has taken a swing against TV re-pair come-ons, listing them among thetop 10 worst buys, reports United Press.FTC advice to consumers is to be waryof something -for -nothing offers, anddeal with reputable firms whose claimscan be trusted.

The other nine gyps are among:Cure-all medicine.Earn -big -money -at-home deals.Hair restorers.Correspondence schools that promise

government jobs.Lotions that positively prevent sun-

burn.Grass seed for lawns that need no

mowing.Reconditioned articles advertised as

lures.Phony furs.Do-it-yourself eyeglass kits.

Generally speaking, the public hasconfidence in the TV tech. This wasproved in Elmo Roper's survey last year(see April 1955 TECHNICIAN, p. 611.But there are always a few who willsoak the sucker for whatever the trafficwill bear. A little story illustrating thispoint was brought to mind by the do-it-yourself eyeglass kit cited by the FTC.

An optician was teaching his son theeyeglass business. "But how do youknow how much to charge?" asked theson.

"That's easy," replied the shrewdfather. "When the customer asks youhow much the bill is, tell him $10. If hedoesn't start to argue, immediately add'for the frames.' Then say to him, 'theglasses will be an extra $10.' Nowyou've got to act fast. Watch the cus-tomer closely. If he doesn't flinch at theprice, quickly add on the word 'each.' "

Without excusing the sucker bait op-erator-I think he should be run out ofbusiness-people too often overlook thefact that a great many customers whoare cheated have themselves to blame.It's an axiom of the confidence gamethat the victim or "mark" must have atouch of larceny in him for the swindleto operate. By thinking he can getsomething for nothing, or trying to putone over on the legitimate shop bypatronizing an establishment thatcharges low, low prices, Mr. Consumeroften lals himself wide open for pad-ded billi.

The wisdom of a fair price for decentquality may be summed up in a state-ment attributed to British author andreformer, John Ruskin: "There ishardly anything in the world thatsomeone cannot make a little worseand sell a little cheaper-and the peo-ple who consider prlie alone are thisman's lawful prey."

a,e16 Circle numbers on free inquly cord, p. 33, for more product data.


NEW from Westinghouse ...

the 6BS8Here is the latest example of Westinghouse leadership in

TV receiving tube design . . . the new 6BS8 Rcliatron®Tube, a very high Gm twin triode amplifier.

owe maw -.AM* WORMS

IMPROVED PERFORMANCEWith higher gain, lower noise, the new 6BS8 gives

particularly superior performance in fringe areas, and

6E1-4 IU7

YOU CAN BE SURE...IF ITS

Westinghouse

also gives consistently letter performance in tuner sock-

ets in areas where Krenger signals prevail.

REDUCED INVENTORYThe new 6BS8 greatly simplifies stocking problems.Now, you no longer have to carry both the 6BQ7-A

and the 6BZ7 . . . the new Westinghouse 6BS8 is 100%

interchangeable with both tubes. The 4BS8 is available

for use in series -string circuits.

Be sure and ask your distributor for the new Westing-

house 6BS8 immediately. Due to tremendous demand,order now to insure your supply.

RELIATRON TUBESWESTINGHOUSE ELECTRIC CORPORATION, ELECTRONIC TUBE DIVISION, ELMIRA, N. Y.


200 lbs. on a 1 0 ft. television mast

1.

2.

3.

4.5.

Protection for your work and yourcustomers.

Freedom from damage due tostorms or corrosion severe enoughto destroy most other masts.Better reception from the sets youinstall.

Insurance for your reputation.Increased good -will and profitsfor you.

JelSTEEL

PERMA-

TUBEsupports

it safely!

What aboutother masts

either steel oraluminum

7

MAKE THIS TEST

YOURSELF

Place a 10 foot length of 11/4"x 16 gage (.065" wall) Perma-Tube between two tables sothat 6 inches rests on a tableat each end. Stand a 200 poundman at the center point.

What happens? Tests provethat Perma-Tube will supportthis 200 pound weight with aminimum of deflection and per-manent set.

And, Perma-Tube staysstrong because it is corrosion -proof (Perma-Tube is coatedwith a metallic vinyl -resin in-side and out).

Other steels and the strong-est grades of aluminum showserious degrees of permanentset. Why? Because they lackthe special strength of J&LSteel that is used to makePerma-Tube Television Masts.

domed df Laugh/etSTEEL CORPORATION - Pittsburgh

Versatile Magnetic ShieldA new low-cost sheet -rolled

shielding material, flexible enough topermit shaping and forming depend-ing on its application, can solve manyproblems involving the unwantedpickup of hum and other stray fields.

In its various forms, the materialcan provide protection against ac orde high -intensity or low -intensitymagnetic, electromagnetic or electro-static phenomena. In one form, high-saturation Netic, it provides highlevel attenuation. Another version,Co-Netic, is a high permeabilityform for low-level attenuation only.Other versions, including Ferneticand Netic Co-Netic, provide combi-nations of characteristics of attenua-tion.

This choice of materials will be aboon to many who encounter humand other stray pickup problems in awide variety of equipment, includingpower supplies and other deviceswhere transformers or coils are used,oscilloscopes and other devices usingcathode -ray -tubes, and many Hi-Fidevices, including low-level inputstages, recorders and turntables.

Sheets of these magnetic shieldingmaterials are available for as little as32 cents per sq. ft. Shields formed toaccommodate a wide variety of crttypes are available for as little as$7.80 in single quantities, with re-duced prices for quantity purchases.Shielded transformer cases are avail-able for prices ranging as low as 65cents each.

The material is manufactured andmarketed by Magnetic Shield Div.,Perfection Mica Co., 1322 North El-ston Ave., Chicago, Ill.

"Personal" 2 -Way RadioGE has come to the aid of ear-

weary 2 -way radio users by remov-ing the chatter of radio calls in-tended for others.

GE engineers have incorporatedsimple electronic tone -selectingequipment in standard 2 -way radios.The tones turn the mobile receiverson indiyidually, thus allowing a dis-patcher to communicate with anyradio -equipped car or truck withoutbothering the other vehicles in thenetwork.

Use of the inexpensive "PersonalChannel" system allows the sameradio range as with standard 2-waysystems. Complicit/4d circuits wereavoided by the use. of tones in thenormal voice range of an FM radiosystem. Thus, degradatiorriransmit-ter signal strength is no problem.

Complete tone dispatching equip-ment for the base station is housedin a small desk -top cabinet.

18 Circle numbers on free inquiry cord, p. 33, for more product data.TECHNICIAN March, 1936

RCA

SELENIU

-one co all replacement requirements!

RADIO CORPORATION Of AMERICAELECTRONIC COMPONENTS IMPRISON, N. J.

Now, RCA offers you a top -grade line of selenium recti-fiers for general replacementuse in TV, radio receivers,and phonographs. Advanceddesign, select raw materials,and superior workmanshipgive you a dependable line ofselenium rectifiers for virtu-ally all service jobs.

Advanced Design forDependable Performanceand Long Life

Note thewide-openplatespacing foreliminationof solidcenter "hotspot." De-sign utilizescorrugatedspacers for excellent heat dissi-pation and rigid construction forrugged service.

NEW-smaller size... for any givencurrent, they are smaller thanother types.NEW-quicker installation .. .integral mounting stud.

NEW-wide-open design ... insuresmaximum heat dissipation, cooleroperation ... no center "hot spots."

NEW-rigid construction . . . forrugged service.

RCA SELENIUM RECTIFIERS-a com-prehensive line-for consistentlygood performance, easier installa-tion, longer life and customer satis-faction. ORDER FROM YOURRCA DISTRIBUTOR TODAY!

WIDE SELECTION OF 12 TYPES

Max. Max. RCA

Output ma Input volts Type

6575

100150200250300350400500400*500*

130130130130130130130130130130130130

205G1200G1206G1201G1207G1208G1202G1209G1203G1204G1210G1211G1

Special thin types for use whereavailable space will not permitthe use of type 203G1 or 204G1.

TECHNICIAN March, 1950Circle numbors on Ire. iritiwory cord, p 33, for mare product data. 19

... anothersrrra

MALLORYservice -engineered

product

There's extra lifein this

MALLORYVibrator

Contact "bounce" and chatter areeliminated in this latest Mallory self -rectifying vibrator. New dual springdesign is the reason. This construc-tion gives clean make -and -break, andprovides dynamically balanced selfalignment.

COUNT ON THEM FOR LONGER LIFE,and freedom from occasional earlyfailure ... for extra service withoutextra cost.

COUNT ON MALLORY,leader in vibrator progress, for con-tinued improvements in performanceof all types of vibrators.

Your local Mallory distributor isstocked with the new vibrators, inboth shunt drive (shown here) andseparate drive models. Order from himnow . . . and make these your standardreplacement for all commercial jobsneeding self -rectifying units.

R.MALLORY&CO.Inc.

P. I. NIALLOes a co. Iwc., INDIANAPOLIS 6, INDIANA

Capacitors Vibrators Resistors

Controls Switches Rectifiers

Power Supplies Filters Mercury

LETTERSTo the Editors

(Continued from page 4)

Association Addresses

Editor, TECHNICIAN:We are very much interested in get-

ting the names and addresses of radio,TV and electronic associations through-out the nation.

B. JUDDTelevision Service Assoc. of MichiganDetroit, Mich.

Association addresses, along with allproducts, manufacturers, distributors,brand names, etc., are listed in the serv-ice industry's only Buyers Directory,published regularly as an annual featureof the May issue of TECHNICIAN.-Ed.

Number One ProblemEditor, TECHNICIAN:

I enjoy your magazine very much,and if it had not been for a travelingsalesman who stopped out here "in thecountry" I would not have known itexisted. I find the number one problemconfronting TV men today is the con-sumer practice of buying tubes whole-sale. This is just as true in the smallvillage, such as this one of 7000 people,as it is in the big cities. The problemof cut rate servicing usually does notexist in small villages as it does inmetropolitan areas. Let's try to lick thewholesale tube problem.

Mum COHENSuburban TV Service Co.Hudson Falls, N. Y.

Bargain Tube AdsEditor, TECHNICIAN:

I have followed with interest your ex-posing of radio and TV tube rackets.Foi years, advertisements in differentmagazines have listed prices consider-ably below that of my local distributor.I have shied away from them, but I didorder 25 'standard brands" once from asupposedly reputable source. Most ofthe tubes were OK, but 3 or 4 hadshosts and had to be thrown away. ThusI did not gain a thing . . . like buyingeggs at,half price and having to throwhalf onhem away.

I have noted that TECHNICIAN isnot filled up with these bargain adver-tisers. Could you recommend those fewtube distrfttors who do advertise inyour magazine as being purveyors offirst class merchandise?

C. CLAYTONMeridian, Miss.

Our policy regarding the acceptanceof bargain tube ads is very strict to pro-tect techs and legitimate companiesalike. To the best of our knowledgeyou're safe with TECHNICIAN tube ad-vertisers.-Ed.

Io'

0

20 Circle numbers on free Inquiry cord, p. 33, fo, ,d,, dTECHNICIAN March, 1956

Service to ReadersEditor, TECHNICIAN:

I would very much like to obtain a

copy of the article, "Eliminating Verti-cal Retrace Lines" from your Sept. 1953

issue. I will gladly pay all costs.D. S. MICHELL

Philadelphia, Pa.

We have a limited number of copiesof past articles you may have missed.As long as the supply lasts, we will sendreaders single copies without charge.Where the supply has been exhausted,we can provide photostats at 500 perpage.-Ed.

VHF -to -VHF Converters???Editor, TECHNICIAN:

Have you ever published any articleson TV converters which convert a highVHF channel to a lower one (9 to 6,7 to 4)? These converters are beingmade and used around here in fringeareas. Most of the fellows use a standardfront end tuner with a 42 me output,reworking the oscillator and i-f to hitchannel 4 or 6, using a small built-inpower pack.

L. D. HOWARDTunnelton, W. Va.

Sorry, we haven't published anythingon this. Can any readers help?-Ed.

Tube Storm Ablowin'Editor, TECHNICIAN:

Who in the world can keep up withthe storm of new tubes? My caddy hasthe appearance of a tube factory stockpile. Each month each manufacturerannounces at least 3 to 5 new tubes.Are they trying to outdo one another?Why do I have to keep five 12BE6's toone 12BA6? This is the first culprit Iyank on radio sets. Did the set engi-neers get the wrong tube characteristicdata? It looks like we're trying to keepup with the drug stores and all theirpills. Let's have fewer pills, and thosethat do the trick.

CLIFFORD D. isssIGMilford, N. J.

Tote That BargeEditor, TECHNICIAN: r

The current issue of our small-townnewspaper (pop. 1450) has aizdver-tisement whereby high schoo dentsof the Future Farmers of America willsteam clean farm buildings for $5 anhour if the farmer will transport thecleaner on his own truck. Aloe be untoany of us radio men if we charged likethat and made our customers haul ourequipment to boot! If unskilled laborcomes that high, tkan either the farmeris not so bad off as he says, or elsewe should be clizirging $10 an hour forour skilledjabffi. Maybe we poor "tink-erers" car/'get government subsidies orbe paid not to do so much work tokeep prices up.

Wyonii4,EUGENE L. WALKER

anothei

MALLORYservice-engineerec

product

Worriedaboutabout ripple?

. . . Use FPCAPACITORS

High ripple currents in TV sets,especially in color, make ripple ratinga major factor in choosing electrolyticcapacitors. For these applications,you can be sure of getting the per-formance you need in Mallory FPcapacitors.

Extensive life tests at ambient tem-peratures of 85° C prove that FP'scan withstand 50 to 100% more ripple

current than usual industry expecta-tion for a given capacity and voltagerating. This extra performance comes

from superior heat dissipating abil-ity, made possible by the fabricatedplate (FP) construction that putsmore anode area and more electro-

lyte into a smaller can.For the best in electrolytics, always

insist on Mallory FP . . . the originalfabricated plate, 85° C capacitor.Don't settle for substitutes!

Capacitors Controls V brators Switches

Resistors RectifiersPower Supplies Filtersh

Mercury Batteries

MALLORYP. R. MALLORY A CO. Inc., INDIANAPOLIS 6, INDIANA

111111111.10111111111111111111111

TECHNICIAN March, 1936Circht numbisrs on free inquiry cord, p. 33, for mons product data. 21

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TV -ELECTRONIC

TECHNICIANe. Circuit Digests

CALDWELL-CLEMENTS, INC., 480 LEXINGTON AVENUE, NEW YORK 17, N. Y.

The World of Servicing at Your FingertipsWouldn't it be wonderful if we could gather

together several hundred of the industry's TV -elec-tronic specialists, and have them write all about themany products and techniques which servicing em-braces? And wouldn't it be still more marvelous ifwe could illustrate and print this material to befunneled to service techs at little or no cost?

Well, that's exactly what we've done in this issue,thanks to the cooperation of a great many manu-facturers. TECHNICIAN editors have reviewed avast amount of material published by these com-panies-color code guides, data books, interchange-ability charts, slide rule selectors, information -packed catalogs and many other reference items-and have written a brief description of each. Allmanufacturers in the industry were invited to par-ticipate in this editorial project, and suitable litera-ture from firms that responded have been includedin this compilation. The capsule literature reviewsappear in this issue starting on page 30, and we arepleased to note that most of them are available toyou free.

You can obtain any of the literature you want

very easily. Just fill in the postage -free card onpage 33, and circle the numbers corresponding tothe code numbers on each literature review whichyou want to receive. If a charge is noted, enclose thecard in an envelope along with the proper paymentin cash, stamps or money order. TECHNICIAN willthen route your request to the manufacturers.

Also presented in this compilation of "must"literature is a listing of many of the most importantbool6 and home courses for service techs, all valu-able additions to your reference library.

There's an excellent reason for recognizing theimportance of reference literature. As the electronicart becomes increasingly complex, it becomes moreand more difficult to retain a significant portion ofproduct and technique information in your mind.Engineers have long recognized this situation, andhave striven to integrate their skills with datareadily obtained from their technical libraries.

You must do the same to secure maximum effi-ciency in your operations. Fill in the card on page33 to build your reference file. Keep the world ofservicing at your fingertips!

Watch Out for Phony ProductsWe've picked up some disturbing information

from the industry grapevine. It is alleged that amanufacturer in Japan is exporting electronicequipment carrying the brand label of a leadingU.S. producer. The bogus version is styled to looklike the real thing, but the quality is reportedly in-ferior.

This illegal copying of another's product, takingadvantage of the confidence buyers have in a longestablished, reputable name, is not a new story.Some time ago there were reports of a Europeanmanufacturer slipping counterfeit TV componentsinto the giant U.S. replacement market.

The best thing you can do to protect yourself isto make your purchases at reputable jobbers whoare the backbone of our industry's distributionsystem. Also, it is imperative that you remain alertto any standard name -brand product that appearsto have significantly inferior workmanship, or isselling at an extraordinarily low price.

Frankly, we do not know the extent of this racket.We need more concrete evidence to substantiate thereports received. You can do yourself and the in-dustry a first rate service by informing TECHNI-CIAN editors of any phony products you comeacross.

TECHNICIAN March, 1956 23

TV SET TANGLES WITH CADILLAC. The TV re-ceiver won. At MGM -TV in Hialeah, Fla., a CBS 21 -in.table model was sitting on a window bulkhead whenthe Caddy rammed into the store front. The impactknocked the set 20 feet into the store. The TV, whilebattered, operated perfectly. The car had to be towedaway.

MENTAL PERFORMANCE is not significantly re-duced under conditions of short-term, high intensitynoise stimulation, says the Air Force.

BOLD TV SERVICE GUARANTEE plan, called theGold Seal Program, has been initiated by Magnavox. Onall receivers selling at $249.50 and up, the company of-fers a three-month free service contract including laborand a one-year guarantee of tubes and parts. Under thisfree service policy, claimed by Magnavox Pres. FrankFreimann to be the first of its kind in TV history, serv-icing will be channeled either through regular serviceagencies or dealers, with Magnavox paying the cost.

HOW MANY TUBES GO BAD within a new TVset's 90 -day warranty period? One manufacturerestimates the average number at one per set. Forcolor TV, average shouldn't be over two per set be-cause of increased number of tubes used.

What happens to test instruments soaked in flood waters or buriedfor days under several feet of silt? Here's a case history of aDuMont scope soaked and impregnated with mud in E. K. Dayesne'sTV repair shop in Woonsocket, R. I. When the instrument was re-ceived by the manufacturer for reconditioning, Dumont's instrumentservice techs fired it up. It worked fine,

24

711 the

MAGNETIC TAPE is expanding into new fields. AU. S. firm is planning to produce a Swedish tape jukebox that has been selling for $1800. A 760 -ft. long35 mm tape at 5 ips is used instead of records. Thetape has 16 channels, and is divided into 12 sectionsalong its length to provide 192 different tunes. An-other report, basically rumor, says that a leadingMidwest TV maker may install 250,000 tape play-back units in the new models of a major automobilemanufacturer.

SMART ADVERTISING DOLLARS are being spent bysome TV schools to promote the qualities of their tech-nician graduates to the servicing industry. This canmean better jobs for the grads, and more students forthe schools.

MARCH 1956 NETWORKCOLOR TV SCHEDULE

MONDAYS through FRIDAYSMarch 1-2, 5-9,12-16, 19-23, 26-333:00-4:00 PM (EST) NBC "Matinee Theatre"

5:30-6:00 PM (EST) NBC "Howdy Doody" (Live)

MONDAY, March 58:00-9:30 PM (ESTI NBC "Caesar and Cleopatra"

(Producers' Showcase) (Live)SUNDAY, March 112:30-5:30 PM (EST)

TUESDAY, March 138.00-9:00 PM (EST)

SUNDAY, March 183:30-4:00 PM (EST)

NBC "Richard III" (Film)

NBC "Milton Berle" (Live)

NBC "Zoo Parade" IFilml

4:00-5:30 PM IESTI NBC "Taming of the Shrew"(Maurice Evans Presents) (Live)

SUNDAY, March 253:30-4:00 PM (ESTI NBC "Zoo Parade" (Film)

7.30-9:00 PM (EST) NBC-"Sunday Spectacular" (Live)

This is the schedule available at press time.


Pictu"NATIONAL TELEVISION SERVICEMEN'S WEEK"

falls on March 5 to 10 this year. This second annualevent, sponsored by RCA, incorporates an extensivemerchandising program which will be promoted in con-sumer magazines, TV, radio and newspapers across thecountry. It is all intended to improve technician busi-

a ness relations. Among the many sales promotion aidsavailable to techs celebrating this week are "Code ofEthics" plaque, identification card, window displays,giveaway consumer booklets and safety glass cleaningcloths, and many others. Participants also receive freesubscription to the RCA house organ "Radio & Tele-vision Service News." Details available at RCA dis-tributors.

TRILLION KILOWATT-HOURS of electrical powerwill be consumed annually by 1965, predicts Syl-vania Chairman Don Mitchell. This is more thandouble 1955's 480 billion figure. The West Coast willlead in growth. By 25 years from now, more thanhalf the plants being built at that time will be nuclearpowered. The 1956 electrical -electronic industry out-put should total $19 billion, an increase of $1.6 bil-lion over last year, and double in the next decade.

COOKING WITH MICROWAVES. Raytheon, which in-troduced the quick -cooking commercial "Radarange"using r -f power generated by a magnetron, has signedan agreement with Hotpoint to supply technical assist-ance and components for ovens to be made and mar-keted by Hotpoint for home use. Who will keep thisoven in repair? You guessed it, electronic techs . . .

another example of growing opportunities in electronicservicing.

OORMONTHS,OSWALD,THE -r v ' li

SERVICE '

SHOPOWNER, 02$ -477,

HAS BEEN')URGED TOJOIN THE

T \./TECHNICIANS'ASSOCIATION!

FURTHERMORE, THEASSO C I AT ON , ITHPROMOTIONAL.... CREDITAND PUBLIC RELATIONSPROGRAMS WILL HELP

YOUR BUSINESSGROW !

e'er

BALONEY!!THERE'S NO77/1THEY CAN TELLME ABOUT MYBUSINESS THATI DON'T KNOW

BETTER MYSELF

MOM

I

CALENDAR OF COMING EVENTSMar. 2-4: Third High Fidelity Music Show, Harrington Hotel,

Washington, D. C.Mar. 5-10: National Television Servicemen's Week.Mar. 12-16: National Electrical Manufacturers Assoc., Edgewater

Beach Hotel, Chicago, III.Mar. 19-22: 1956 IRE National Convention and Radio Engineering

Show, Waldorf-Astoria and Kingsbridge Armory, NewYork, N. Y.

Apr. 13-14: Tenth Annual Spring Television Conference, Engineer-ing Society of Cincinnati Bldg., 1349 E. McMillan St.,Cincinnati. Ohio.

Apr. 14-27: United States World Trade Fair, New York Coliseum,New York, N. Y.

Apr. 15-19: The 34th annual convention of the National Associationof Radio & Television Broadcasters, Conrad Hilton Hotel,Chicago, Ill.

May 21-24: 1956 Electronic Parts Distributors Show, Conrad HiltonHotel, Chicago, Ill.

May 22-23: RETMA Symposium on Reliable Applications of ElectronTubes, Irvine Auditorium, University of Pennsylvania,Philadelpiia, Pa.

June 27-30: Jobber -Rep -Mfrs. Conference, Breezy Point Lodge,

Brainerd, Minn.July 22-25: 1956 National Audio -Visual Convention and Trade

Show, Hotel Sherman, Chicago, Ill.

COMMUNITY TV VIEWERS in Tonopah, Nevada, re-ceive a satisfactory signal from KRON-TV, locatedsome 285 miles away in San Francisco.

OLD ALUMINUM PARTY GIMMICK has been re-vived by California TV dealer in selling his colorline. He asks an enthusiastic customer to invite somefriends to her home for coffee and cake-and to seecolor TV. She receives payment based on number ofcolor sets sold to her guests.

LISTENTOOSWALD'STUNE-.

`\\\WHEN 7,THEGOINGGETSROUGH

L

% /,

EVERY714416'S GOIN' HAYWIRE!!WHOLESALERS SELLING RETAIL TO THEPUBLIC ! CALL-BACKS BY THE CAR -LOAD!SLOW COLLECTIONS! POOR CREDIT! TINYPROFITS! THAT'S THE TROUBLE WITH THI5T N./ INDUSTRY! NO LEADERSHIP! NOPROGRAMS! NO COOPERATION! 140 NOTHING!

BLA-BLA-8LA-BLA!

-

in your problem fur illustration here' Ifaccepted you will rec Aye credit and the originalla -ge drawing for display.


Physical Grounds Are NotChanges in Lead Length, Lead Dress, and Point of Return on the

A. R. CLAWSON

Many headaches fall to the servicetechnician due to the very nature ofhis work, and not the least of theseare difficulties he gets into by someinadvertently committed oversightof his own. The case histories thatfollow will treat such errors thatfall into the category of improperlyplaced grounds. Included are in-stances of improper lead length toground. While leads in high -fre-quency amplifiers should generallybe as short and direct as possible,there are a few instances where"improper length" means that a leadis actually too short. Let's look atcases.

A technician -dealer recentlypulled a chassis on which the com-plaint was poor (nearly absent) pic-ture and weak sound with noise. Thereceiver was an intercarrier typewith the i-f in the 40-mc range.Routine testing easily revealed thatthe defect was in one of the i-fstages. The cause for failure was aburnt -up cathode resistor, whichwas plainly apparent. Furthermore,the associated bypass condensershowed signs of physical damagefrom the heat of the burning re-sistor. As a result, the resistor, thecondenser and the tube were all re-placed. Power was applied and thenthe trouble began.

On strong signals, all was in goodorder except for slight traces of re-generation which might pass inspec-tion by the average customer. On

medium and weaker stations thetrouble mounted, and ranged all theway from moderate regeneration toall-out oscillation. "Maybe I put intoo hot a tube," was the technician'sfirst reaction. So several tubes weretried with no significant change inresults. The possibility of misalign-ment was considered. There followeda fruitless attempt to realign the i-fsection. Since no hint of regenera-tion could be found in an appraisalof the customer's original com-plaint, something had apparentlyhappened during troubleshootingand repair.

"Stubs" & Long LeadsInspection of the technician's re-

placement job showed that the re-sistor and condenser had been sol-dered together as a single unit (Fig.IA). In removing the original re-sistor -condenser combination, twowire stubs, about a quarter inch inlength each, had been left when theoriginal components were clippedout of the circuit. The new combi-nation unit was inserted by being"tacked" to these stubs. (Fig. lB.)

To eliminate the new complaint,excess lead length was cut from thecombination replacement unit. Aboutan inch was cut from each wirecoming out of the condenser, andthe two stubs remaining from theprevious wiring were also removed.The total length of series wire re-moved came to about 21/2 in. Thislength had constituted a series in-ductance in the cathode. After

Fig. 1A-Resistor-condenser unit used for replacement. Unit asfirst wired into circuit. C-Final layout to stop regeneration.

SOLDER

C

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physical re -replacement as shown inFig. 1C, the set performed in satis-factory fashion.

This i-f stage had been designedat maximum gain for a tube typehaving certain specified values ofGm and grid -to -plate capacitance(C), when gain was not reducedby agc action. Additional couplingexists, as shown in Fig. 2. Shown inthe schematic of Fig. 2A are the"phantom" capacitances Cm, (grid-to -plate), Co (grid -to -cathode),and C, (suppressor -to -plate). Alsoshown is the normal inductance ofwiring in the cathode circuit (LI)and the inductance added by the ex-cess wiring (L2). The two mainpaths are simplified in Fig. 2B. Thefirst path, which includes C,shunts a second path made up ofCo, Lk, the cathode -to -suppressorconnection, and C. Haphazard re-wiring had changed these values andincreased the coupling. The resultwas that a resonant circuit had beenset up that encouraged oscillation atlow values of agc voltage.

Case of the Ground ShieldAnother case history parallels the

one just recounted. A cathode re-sistor had been replaced in a designusing, no bypass unit. Fig. 3A showsthe manner in which the technicianhad elected to return the resistor toground, to a convenient point on thenearby shield. Eventually, the ex-cess added lead length had to be re-moved and the resistor was returnedto the less convenient original point

Fig. 2A-"Phantom" coupling in the circuit, not shown on ordinaryschematic. 11-The two paths of "phantom" coupling, simplified.

26TECHNICIAN March, 1936

Always Electrical Grounds

Chassis Are Some Factors That May Alter Nature of the Circuit

Fig. 3A-Replacement cathode resistor ground-ed to shield. B-Correct chassis return point.

LANCE

A

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SCKENSUPPL

SCREEN,

Fig. 4A-Circuit oscillated with wrong con-denser rating, short leads. B-Fault corrected.

of connection, as designed (Fig. 3B).While this set had not begun to os-cillate, after repair, to the same ex-tent that had been the case with thefirst case discussed, too Rauch re-generation was present please thecustomer.

Consider the extra path length inthe ground return added by the firstattempt at repair. There was theadded path of the shield. There werethe two angle mounts that held theshield to the chassis (though onlyone is shown in the side view ofFig. 3, another one, which would fallbehind the one shown, was present).

There was added length along thechassis. There was also the extralead length from the resistor. Thenormal cathode inductance, deter-mined to be about 0.012 microhenry,had been more than doubled toabout 0.028 microhenry. This wasenough to cause the trouble.

This case illustrates the care thatmust be exercised in choosing thepoint to which a ground return ismade. Shields and portions of thechassis itself may possess appreci-able inductance, which becomes par-ticularly important at elevated fre-quencies in the vicinity of 40 mc.

A final case history illustratessome factors that did not enter intothe preceding examples. For onething, it demonstrates the impor-tance of using exact replacementsinsofar as possible, even for appar-ently minor components. It alsoshows that leads can sometimes bemade too short, rather than too long.

Too Many PrecautionsThe i-f strip of the set under con-

sideration was also in the 40-mcrange. It was an intercarrier receiverwith a leaky screen bypass conden-ser in one of the composite i-f stages.Naturally, screen voltage was lowand the stage gain was near zero,with the usual destructive effects onpicture and sound performance. Thetechnician who made the replace-ment was conscientious. To guardagainst future breakdown, he chosea replacement with a higher voltagerating. In so doing, he also switchedto a tubular type. He also made hisleads short, cutting away what ap-peared to be some unnecessary leadlength associated with the originalpart. (Also replaced was the drop-ping resistor shown in Fig. 4, butthis does not enter into the prob-lem.)

When the set was switched on, itturned out to be a "howling" suc-cess, literally. Oscillation was al-most as bad as in the first case dis-cussed. Fig. 4A shows the condenseras it was wired into the circuit onthe first attempt at repair. After an-other attempt at wiring (Fig. 4B)

the oscillation disappeared. For thesecond attempt, wiring of the origi-nal layout was followed as closely aspossible, with lead length and con-nections carefully duplicated. Also,the condenser used was the same asthe original in physical size, valueof capacitance and voltage rating.

Leads Are ComponentsIn original manufacture, the re-

ceiver in question had relied uponseries resonance in this stage's by-passing, with the stage working nearmaximum gain. The inductance ofthe leads, as wired in manufac-ture, was used to obtain appropriatebypass action. Shortening the leadsin the first attempt at replacementreduced this inductance and raisedthe resonant frequency. This wasoffset partially, but not completely,by the fact that the condenser withthe higher voltage rating had moreinductance than the original con-denser. To be safe, the final replace-ment was made with a unit of thesame type and rating as that speci-fied in the manufacturer's parts listand original layout and dress werefollowed.

If series resonance is suspected asplaying a part in bypass action, allcapacitances and inductances, in-cluding lead inductances, should beexact replacements. Different typesof condensers, such as postage -stampunits as compared to tubulars, notonly vary from each other with re-spect to their inductance, but theyalso vary in Q. Furthermore, thesefactors vary within a given type de-pending on capacitance value andvoltage rating. The Q of a condensermay also be important in a circuit,since a higher Q will result in anarrower resonant peak, and alower Q will result in a broaderband. The bandpass of a stage maythus depend on the condenserchosen.

While the three illustrative casesall involve i-f stages, the difficultiesdescribed would occur in r -f circuits,of course, and even, to a lesser ex-tent, in video -detector and video -amplifier circuits.


Test Instruments Used in

ROBERT G. MIDDLETON,SIMPSON ELECTRIC CO.

Color TV servicing proceduresoften require the use of demodulatoror detector probes in combinationwith oscilloscopes. For example, thedetector (usually crystal) probe isused to demodulate a video -fre-quency sweep voltage that has beeninjected into a video amplifier, be-fore this signal is applied to theoscilloscope. The procedure is fairlystraightforward, but there are somelimitations in probe response thatmust be recognized.

One of these limitations is the in-ability of the demodulator probe torectify and filter video -frequencyvoltages completely, when thesevoltages fall below approximately 75kc. Fig. 1, for example, shows theresponse of a Q demodulator in acolor TV receiver, in which a largeamount of "fuzz" appears at the low-frequency end (to the left). Thisfuzz consists of that portion of thevideo -frequency sweep signal whichfeeds through the probe, without be-ing adequately detected and filteredby the short time -constant of theprobe's filter network. The result isa semi-undemodulated display.

r\,Fig. 1-Demodulated response of a Q demod-ulator circuit, showing semi -detected fuzz.

Fig. 2-Undetected video -amplifier response.

Part Don't Be Misled

Of interest in this connection isthe wholly undemodulated swept re-sponse curve shown in Fig. 2. Thishas been applied to the scope froma video -frequency amplifier througha low -capacitance isolating probe,rather than through a demodulatorprobe. It shows both the negativeand positive (mirror -image) por-tions of the unrectified and un-filtered sweep signal, and illustratesthe utility of the demodulator probein developing the single -image waveenvelope of this signal for scope ob-servation, despite probe deficiencies.

Not only does the conventional de-tector probe fail to detect completelythose sweep signals below about 75kc, but it also attenuates them, giv-ing a false picture of the actual re-sponse. While various probes may

Fig. 3-Details of low -frequency response ofvarious demodulator praises, showing uncle-modulaled fuzz and attenuation for all types.

Fig. 4-Fuzz not too apparent in widebandcircuit, like the Y amplifier curve shown.

Fig. 5-Spurious beat -frequency markers.

differ somewhat in this characteris-tic according to their design-someare full -wave or half -wave rectifiertype,s, some use series or shunt de-tectors, some have long or shorttime -constant filters-none are muchuse below the stated frequency. Thisis illustrated in Fig. 3, where theresponse of various probes to a flatapplied sweep signal is shown. Ineach case, the dip in the response isan absorption marker at 50 kc, usedfor ideirfication of response at thatpoint. In each case, response is drop-ping off rapidly in this region.

When a wideband video -frequencycircuit is tivt, undemodulated fuzz,while present, is not nearly so evi-dent in the pattern, because it hasbeen compressed into a narrow re-gion at the low -frequency end of theresponse curve. Thus, the Y ampli-fier response shown in Fig. 4 doesnot show much undetected fuzz (atthe left), although the fuzz is actu-ally present. It could be made ap-parent by greatly increasing thehorizontal gain on the scope to show


Color Television Serviceby Confusing Scope Indications

Fig. 6-Absorption marker may be hard toIdentify where ringing marks response curve.

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fia1411

WO KEYINGTRANSIENT

Fig. 7-Keying transient on horiz. sync pulseleaves misleading mark similar to sync burst.

an expanded view of the low -fre-quency portion of this responsecurve. In any case, checking low -frequency response by other means,such as by square -wave testing, ispossible.

In Fig. 3, it will be noted, absorp-tion markers were used to identify aspecific frequency on the swept re-sponse curves, rather than the 'morefamiliar beat -frequency type ofmarker. In color TV service work,these absorption markers will oftenbe preferred. Since video -frequencysweeps often have a high percentageof harmonics, beat -frequency mark-ers will often produce misleadingspurious markers, as shown in Fig.5. The applied marker is shown atthe center of the curve; spuriousmarkers appear to the leit and rightof it.

When an absorption marker isused, much of this difficulty isavoided. Since an absorption markeris a passive rather than an active in-dicator, it has no harmonics as suchand does not give rise to significantspurious indications. However, an-other sort of difficulty is sometimesencountered. The delay line incor-porated in the Y amplifier of the

color TV receiver tends to causeringing, as may be seen in theY -amplifier response curve of Fig. 4.This ringing is often coupled to someextent into other portions of the re-ceiver, like the chrominance cir-cuits, that follow the Y amplifier.Fig. 6 shows the response curve of ared (video) amplifier, which ismarked by delay -line ringing aswell as by an absorption marker.Some confusion occurs when an at-tempt is made to determine whichundulation is being produced by themarker. However, if the techniciantouches his finger to the marker -coilterminal, the marker dip will moveon the curve while the other oscilla-tions remain stationary. This pro-vides the necessary identification.

Fig. 8-Color bar output on wideband scope.

Fig. 9-Color bar output on narrowband scope.

Occasionally when a color -bargenerator is used to check the chro-minance circuits, the technician mayfind it advisable at one point toswitch off the chroma signal. At thistime, expecting all evidence of thecolor -sync burst to disappear, hemay be surprised to and that theback porch of the sync pulse is notentirely cleared. The pulse which isstill present (Fig. 7) however, isactually a keying transient from the

gating circuit, which is not entirelysuppressed. There is no 3.58-mcvoltage present, despite appearances,and the disturbance, which has acertain resemblance to burst signal,will not energize the color circuits;it is basically a low -frequencytransient.

To check the output from a color -bar generator, a wideband scope isessential. The scope should have fullresponse at the color -burst fre-quency of 3.58 mc, since the patternwill otherwise be misleading. Fig. 8shows the display obtained when theoutput from a color -bar generator isapplied to the vertical -input termin-als of a wideband scope. The burstand the 3.58-mc component of thecolor bars are properly reproduced.

However, compare the display

(Continued on page 71)

Fig. 10-Vectorimeter patterns distorted bypoor transient response of scope amplifiers.


lid Your Literature Filecan do this in minutes

Your literature file and technicallibrary are valuable and necessaryelements in the operation of anefficient TV -electronic service shop.You can benefit from the manyprinted service aids prepared bymanufacturers for service techs.Most of them are available just forthe asking. Also, books and homecorrespondence courses are valuableways to learn and build your refer-nce files.The editors of TECHNICIAN have

gathered together the cream -of -the -crop literature for the servicingindustry. Each item is briefly des-cribed below, and assigned a codenumber corresponding to the numberprinted on the postage -free inquirycards on page 33. To obtain thedescribed material, all you need dois circle those numbers on the in-quiry card corresponding to numbersassigned to the literature descrip-tionsand address, and drop in the mail.TECHNICIAN will funnel all re-quests to the proper sources. That'sall there is to it! In a few weeks, theliterature you want will be flowinginto your mailbox.

Literature descriptions are dividedinto five sections.

1. FREE LITERATURE FROMMANUFACTURERS: Included inthis group are reference data, inter-changeability charts, inventoryguides, component cross-references,data -packed catalogs, and similarvaluable literature aids which willbe sent to you without charge.

2. LITERATURE FROM MANU-FACTURERS (AT NOMINALCHARGE): These publications aresimilar to the free literature notedabove. In most cases this material ismore comprehensive and morecostly for manufacturers to prepare,so a small fee is charged, the amountbeing noted in the description. Anyitem for which there is a charge iscoded with the letter "c" at the endof the inquiry number. The properamount in cash, stamps or moneyorder should be enclosed with thecard in an envelope when ordering.3. FREE INFORMATION ONBOOKS: This roundup of top-notch

technical and business books forservice techs describes valuable ad-ditions to the shop library.

4. FREE INFORMATION ONHOME CORRESPONDENCECOURSES: Write-ups of courses andtheir cost offered by various schoolsto improve your service techniques.

5. FREE INFORMATION ONPRODUCTS ADVERTISED INTHIS ISSUE: Data will be sentwithout charge (unless noted other-wise) on any product advertised inthis issue. Descriptions and codenumbers are given on page 39.Inquiry card on page 33 mayalso be used to write in numbers re-questing more material on newproducts and manufacturers' bul-letins presented elsewhere in thisissue.

r

FREE LITERATURE FROMMANUFACTURERS

Circle 101"Ultra -Linear" audio output transformers arcdiscussed in 16 -page booklet. Of special in-terest are 7 pages of amplifier circuits, with3 pages discussing operating details. Free.(Acro Products)

e

Circle 102Storage bins of all shapes and sizes, in metaland plastic, help keep a neat shop withhardware and components right at hand. 16 -pager shows many drawer and swing bintypes. Free. (Akro-Mils)

Circle 103Electric garage door openers, key lock andradio controlled, and TV antenna rotator. aredescribed on sheets ready for notebook in-sertion. How "Lift -A -Door" works Is brieflyexplained Free (Alliance Mfg.)

Circle 104Auto radio vibrators, including circuit dia-grams, interchangeability charts and specs.are presented in an 8 -page brochure. Free(American Television & Radio)

Circle 105Phonograph cartridge replacement chart pre-sents valuable information, including price,voltage output, frequency range, recordspeed and recommended needle, for manydifferent cartridges. In addition, the 8 datapacked pages list replacements for 12 differ-ent manufacturers. It's a real aid in phonoservicing. Free. (Asiatic)

Circle 106Electrolytic and paper capacitors are amongthe hundreds of types shown In this 16 -pagepocket -sized guide to this important replace-ment component. Ratings and prices of singleand multiple units listed. Free. (Astron)

Circle 107Tube tester and crt rejuvenator -tester areaccurately described, along with their useand profit -making benefits In several sheetsof descriptive literature. Free. (B&K Mfg.)


,-

..0

.All7

to Speed Servicingat little or no cost. Here's how

Circle 108Master TV system installation manual, con-sisting of 12 Information -packed pages, tellswhat these systems are, how they are con-nected, maintenance hints, charts, and howto calculate system requirements. In addi-tion, a handy little booklet called "TV for 2,or 3, or More gives the basic story aboutmulti -set systems. Free. (Blonder -Tongue)

Circle 109Boosting antenna signal level can be accom-plished with a special broadband amplifiermounted on the mast. Description of unit,with schematic and parts list, is providedin large 4 -page folder, along with installa-tion data. Free. (Blonder -Tongue)

Circle 110Complete battery manual is actually a 9 x 12in. book loaded with information. In addi-tion to showing a complete line of batterieswith technical specs, there is a cross-refer-ence guide for some 20 manufacturer anduser type numbers, radio replacement guideby set make, test instrument replacements.transistor requirements and lots more. Free.(Burgess)

Circle IllMiniature tube reference guide offers specsfor 329 electron tube types, including 79relatively new types, plus 135 basing dia-grams. In addition to this helpful 12 -pagereference, a second booklet on TV series -string tubes is available, complete withspecs and related tips useful to technicians.Free. (CBS-Hytron)

Circle 112TV picture tubes will not cause designationworries if you have these two publicationshandy. One Is a comprehensive listing ofb&w and color pix tubes, from 3 to 30 in.sizes, with technical specs and basing dia-grams. The other reference is a substitutionchart, which shows exactly which types canbe replaced with other pix tubes, andwhether the interchange is direct or re-quires modifications. Free. (CBS-Hytron)

Circle 113Component reference packs huge amount ofdata into this revised 16 -page edition. In-cluded are a great many volume controls,switches, capacitors, printed electronic cir-cuits, steatite insulators, and shafts. Ratings,cost and designations are all given. Free.(Centralab)

Circle 114TV antennas are closely examined In twotechnical brochures. In the 8 -page "Rain-bow" literature, a 4 -page article describesthe theory and design of an all -channelyagi. In the "K. 0." brochure, a . designachieving extremely high front -to -back ra-tios is discussed. Free. (Channel Master)

Circle 115UHF TV Installations often cause problemswhen techs arc not familiar with the uniquecharacteristics of those frequencies. "The 13Questions Most Often Asked about UHF In-stallations" provides many of the most im-portant answers. Free. (Channel Master)

Circle 116Test equipment catalog covers specs anddescriptions of laboratory quality voltageand resistance testers, current transformersand phase indicators in 20 pages. Free.(Davenport Mfg.)

Circle 117TV picture tube data on giant (32 x 24 in.)

chart ready for wall mounting. This muchsought after reference for technicians listsall important crt specs in large, bold type,along with bulb information and basing dia-grams. Dimensions, deflection, voltage, etc..for over 220 different pix tube types aregiven. Free. (DuMont)

Circle 118Test instruments, 12 pages of them in kitand wired forms, are pictured and describedin the new 1956 catalog. Included are meters,scope, generators, geiger counter, testers.probes and almost everything else neededfor TV troubleshooting. Free (Eico)

Circle 119CRT testers, what they are and how theywork, are presented in a 36 -page bookletcalled "Wher. Mr. TV Has a Headache," andtwo smaller brochures on the "Volta-Chek"and "Vitameter." Latter instrument, usefulon home calls, repairs TV pix tubes withoutremoval from cabinet. Free. (Electronic TestInstrument)

Circle 120Phonograph cartridge interchangeabilityguide, in the form of a double circular sliderule, provides direct replacement numbersfor 8 manufacturers, covering all popularcrystal and ceramic units. Spec table is alsogiven. Free. (Electro-Voice)

Circle 121High fidelity audio products, includingspeakers, microphones, cartridges, enclo-sures, amplifiers and tuners are describedin these two booklets, one a 16 -page cata-log, and the other a 20 -page brochure onchoosing speaker systems. Free. (ElectroVoice)

Circle 122Mikes, cartridges and sound powered tele-phones are briefly described in spec sheets.Free. (Elgin)

Circle 123Storage cabinets and shelving of many dif-ferent types are offered in this 16 -pagecatalog. Alsa, handy booklet, "How to SolveYour Storage Problems. ' Free. (Equipto)

Circle 124Antennas and transmission line are exam-ined in two handy booklets. The first dis-cusses gains, elements. radiation patternsand antenna design. The second offers de-sign curves, attenuation and other charac-teristics fot open lines, twin lead and coax.Free. (Fretco)

Circle 125TV picture tube replacement guides, one ahandy pocket-size 12 -page booklet listingspecs on all different types from 8 -in. metalround to 27 -in. glass rectangular, and theother a 4 -pager on aluminized pix tubes, in-cluding a replacement chart and explana-tion of aluminizing, provide basic referencefor all shops. Free. (General Electric)

Circle 126Receiving and pix tube information can al-ways be :n front of you thanks to twohighly useful wall charts. One lists the typesand prices of receiving tubes, diodes, tran-sistors and pix tubes (list prices for cus-tomers to see). The other chart is essen-tially the same as the comprehensive 12 -page pix tube replacement guide, exceptthat all data Is printed on one side of alarge sheet, ready for wall mounting. Free.(General Electric)

ITS EASY TO OBTAIN

THIS LITERATURE!

1. Read descriptions of literatureon pages 30-39.

2. Grcle code numbers of itemsyou wish to receive on postage -free self-addressed card onpage 33.

3. RII in your name and addresson card, detach card and r. ailimmediately.

4. When ordering literature forwhich a charge is made de-signated by "c" after codenumber), fold card and enclosein envelope with correct amountin cash, stamps or money order,in an envelope. TECHNIC:ANassumes no risk for cash sent byn ail.

Circle 127Promotional and service aids, 16 pages ofthen-. include business identifications, signs.direct mail advertising cards, sales pack-ages Job tickets, stickers, tube puller, shopgarments, and many other helpful Items.Free.. (General Electric)

Circie 128Trarsistors and rectifiers are presented withwith technical specs in this 8 -page bookletcovering Junction pop and npn and ger-manium stacks. Also, handy reminder cardlists several germanium diode types that areinterchangeable. Free. (General Electric)

Circle 129Transistor spec sheets, 4 of them, describemaximum ratings, average characteristicsand typical operation. Free. (General Tran-sistor)

Circle 130Hi-Fi furniture, including equipment cabi-nets and speaker enclosures, is attractivelyshown in this 1956 brochure containing 34pages. Free. (G&H Wood, Cabinart)

Circle 131Test equipment, nicely illustrated in ahandy 8 -page booklet, plus spec sheets. in-cludes a digital vtvm, a vacuum tube vom,osc lloscopes, bar -dot generator and otherhign quality instruments of considerable In-terest to TV -electronic service technicians.Free. (Hycon)

Circle 132Vibrator replacement and service guide for12 -volt auto ignition systems is printed ontwo pages of very heavy paper. Chart listsreplacement for 22 auto vibrator makes andcar brands. Free. (James Vlbrapower)


Circle 133TV antenna mounts and accessories are wellillustrated and described in this 16 -pagecatalog. Included are a great variety ofmounts, brackets, anchors, screws and masttubing. Free. (Kenwood Eng.)

Circle 134Solder and soldering irons are presented intwo handy -sized 4 -page brochures. Free.(Lenk Mfg.)

Circle 135The vibrator guide containing over 50 pagespacked with data is a must for any techwho services equipment with vibrators. Thefirst 32 pages list all set makes and models.together with replacement parts numbersand buffer capacitor values. Servicing notes,circuits and cross-references are also given.Normally selling for 15c. it will be sent toTECHNICIAN readers free. (Mallory)

Circle 136Electrolytic capacitor replacements, manyhundreds of them, are presented with ratingsand dimensions in 20 pages. They are listedtwice, once by rating sequence, and once bycatalog numbers. Free. (Mallory)

Circle 137TV coil replacement guide, covering peakingcoils, i-f transformers, antenna matchingcoils, linearity controls, oscillator coils andothers, cross-references coil numbers againstspecific chassis numbers of various setmanufacturers for easy replacement. Over60 pages of this valuable data. Free. (J. W.Miller)

Circle 138Public address audio equipment, includingamplifiers, portable speakers, remote controlsand rack assemblies, is illustrated and de-scribed in this 20 -page brochure. Free.(Newcomb)

Circle 139Wire meters, cutters and reels, excellent forany shop handling or selling considerableamount of wire and cable, are pictured inseries of spec sheets. Free. (Olympic Instru-ment)

Circle 140"Fernetic" and "Co-Netic" shielding giveselectromagnetic and electrostatic protection.Applications include crt shields and r -f sup-pression. What this material is and how Itworks are explained in this 12 -page bro-chure. Free. (Perfection Mica)

Circle 141Electrical tape and printed circuits are thesubjects of 3 brochures. Two 4 -pagers givespecs and application tips on different tapetypes. The 8 -pager on printed circuits tellsthe story from basic laminate to finishedchassis. Free. (Permacel)

Circle 142Belt driven generators and stand-by powerplants are shown in this 12 -page brochurecovering a variety of powers and ratings.Free. (Pioneer Gen -E -Motor)

Circle 143Test equipment brochure, a brand new one,packs lots of technical data on generators,vtvm's, probes oscilloscopes, tube testers,and multitesters in 12 large pages. Of par-ticular interest are two pages explainingtube tester functions, requirements and cir-cuit operation. Free. (Precision Apparatus)

Circle 144Paper and electrolytic capacitors of all kinds-a wealth of useful data-are described inthree separate brochures. The first is a 24 -pager giving specs, ratings and prices onelectrolytics. oi. metallized and regular pa-per types. Second is a 20 -page brochure andwall chart on hermetically sealed miniaturepaper tubulars. Third is an 8 -pager provid-ing engineering data on metallized papercapacitors. Free. (Pyramid Electric)

Circle 145Selenium rectifiers, their characteristics, per-formance and circuit applications, are shownin this punched 4 -page brochure. Free.1Pyramid Electric)

Circle 146Capacitor -resistor analyzer technical manualdescribes circuits, qualitative and quantita-tive measurements, and maintenance. Pro-cedures for making tests given in this 16 -page booklet. Free. (Pyramid Electric)

Circle 147Volume control cleaner and lubricant arepresented in a handy -sired 4 -page brochureand distributor sheet. Free. (Quietrole)

Circle 148Selenium rectifier replacement guide forradio, audio. TV and associated electronicproducts lists set maker's model and chassisnumbers, parts number and replacementpart designation in 28 data packed pages.Many less common set names like Alden,Consolidated and Hiners are Inctuded, inaddition to all popular brands. Free. (RadioReceptor)

Circle 149Pix and receiving tubes will not cause youinventory problems if you use this 1956"Tube Movement and inventory Guide."consisting of 22 pages listing all importanttube types, with ruled spaces for writing inorders and inventory for every month. Asecond offering is the wall chart listing re-placement aluminized pix tubes for oldertubes, complete with specs. Free. (RCA)

Circle 150Battery replacement guide, contained in thispocket-size 40 -page book bound with metalspiral for easy reading, lists battery equiva-lents for various makes, replacements forall portable radios listed by model, andterminal designations. Extremely helpful ingetting the right battery in the right set.Free. (RCA)

Circle 151Phonograph cartridge guide consists of 4 -page listing of RCA record changers withcartridge replacement numbers and outlinedrawings of units. Free. (RCA)

Circle 152TV antennas and accessories of many differ-ent types are covered by this 25 -page cata-log. Included are UHF models. VHF conicaland yagis, indoor and window types, mounts,couplers, masts and rotors. Free. (RMS)

Circle 153Yokes, Bybacks and coils are comprehen-sively covered in four separate pieces ofliterature. The 42 -page catalog and 8 -pagesupplement contain a complete replacementguide listing TV sets by makes and models.coil numbers and their replacements, andcircuit applications. Also available are aprice schedule and cross-reference chart ofcoil designations. Free. (Rogers Electronic)

Circle 154Phonograph cartridges, with sheets func-tioning as visual replacement guides, aidservicing of automatic changers and manualplayers. Free. (Ronette)

Circle 155Battery eliminators for 6 and 12 volt sys-tems are described in this 2 -pager. Free.(Schauer Mfg.(

Circle 156Parts storage bins are shown in this 4 -pagebrochure and extra price list sheet. Free.(Service Parts Systems)

Circle 157Replacement needle reference guide for allphonographs makes it easy to replace wornneedles. Just pick out the needle from anyof the 442 drawings of different designs,and make replacement. Two other cross-references included in this valuable 22 -pagereference lists needles by phono maker andcartridge maker models. Normally sellingfor $2.50. this guide is available to TECH-NICIAN readers free. (Recoton)

Circle 158Cartridges, mikes and tape heads are amongthe many audio products presented in this12 -page brochure. Of particular interest arethe cartridge replacement chart for 10 manu-facturers, and head replacement chart for

tape recorders. Separate sheet lists 132 cart-ridges which can be replaced by ceramicseries. Free. (Shure Bros.)

Circle 159Test equipment descriptions and perform-ance are presented In two bulletins. A 6 -pager covers multitesters, scope, generatorsand various meters for radio -TV servicing.A 4 -page brochure shows instruments forrepairing industrial equipment and appli-ances. This includes temperature, line cur-rent and watt meters. Free (Simpson Elec.)

Circle 160Intercoms for home and commercial use areattractively described, along with types ofsystem connections, in 7 brochures covering30 pages. Different models from 2 to 24 sta-tions are presented. offering techs new audiosales opportunities. Free. (Masco-MarkSimpson Mfg.)

Circle 161Public address sound systems, from 5 to125 watts, are presented in this 20 -pagebrochure, plus a 6 -page and 2 -page bulletin.Portable amplifiers, speakers, piton°, andaccessories. Free. (Masco-Simpson Mfg.)

Circle 162Ceramic capacitor replacement manual cov-ering TV sets made since 1950 lists modelsproduced oy 76 set manufacturers, togetherwith capacitor ratings, type numbers andcircuit section component is used in. This66 -page reference should prove invaluableto every service tech. In addition, a large"Ceramichart" for wall mounting show.ceramic capacitor circuit applications, char-acteristic table, codes. Free. (Sprague)

Circle 163Electrolytic capacitor replacements are ful:ypresented in two highly useful referencemanuals. One is a 66 -pager covering 4.664TV models made by 85 set manufacturers.Specs and replacements are cross-referencedto original parts numbers. The other is an 8 -pager listing replacement electrolytics for allauto radios. Free. (Sprague)

Circle 164TV accessories described in several sheetsinclude crt tester adapter, loopsticks, I -f sig-nal booster. anJ handy six -page brochure"How to Make an 'Extra Buck' on all Serv-ice Calls." Free. (Superex)

Circle 165TV picture tubes and crt's, from the 3HP7to the 30BP4, are listed in 4 references thatare a must for every shop. There's the 24 -page manual listing the specs of all magneticand electrostatic types, with base diagrams.The wall chart on aluminized pix tubesshows replacements for original types. Thepocket-size 12 -page pix tube selector en-ables you to note specs immediately. Last,and far from least is the giant TV picturetube comparison chart ready for wall mount-ing. Free. (Sylvania)

Circle 166Receiving tubes are comprehensively cov-ered in this very desirable 48 -page referencecovering the characteristics and basing ofany tube a technician would come across inhis servicing. Free. (Sylvania)

Circle 167Business and service aids are attractively il-lustrated in two booklets. One is the brandnew 20 -page "A Guide to Good Business,"which tells how to plan operations, put upwindow displays, analyze earning power,and lots snore. The other is the 8 -pagershowing store identifications, technical aids,tools, business forms and shop garments.Free. (Sylvania)

Circle 168Crystal diode replacement problems? Thisinformative guide ready for book insertionor wall mounting lists many silicon andgermanium types. Free. (Sylvania)

Circle 169Antennas, couplers and accessories for TVand FM are attractively presented, along


32 TECHNICIAN March, 1956

--.1=14111.1111Mkkirmo-v

with gain characteristics and radiation pat-terns. A great many different types andmodels are shown in 30 pages punched andready for insertion in your reference note-book. Free. (Taco-Technical Appliance)

Circle 170TVI analyzer, filters, traps, boosters andother accessories are shown in this 8 -pagebrochure. Free. (Telematic)

Circle 171Transformers, yokes and coils of all kindsfor TV are cross referenced under TV setmanufacturer and models numbers, brokendown according to coil function. A goldmine of useful data is included in this val-uable 40 -page replacement guide. A secondbrochure catalogs amplifier kits, with cir-

s cults, toroids, chokes and other transformersof interest to techs in 32 pages. Free.(Triad)

Circle 172Panel and flashlight lamps are compiled inthis 2 -page chart. Lamps by 7 leading manu-facturers are listed with specs and drawings.Free. (United Catalog)

Circle 173High fidelity speakers, including the operat-ing principles, tweeters, horns and othertypes, are discussed in simple terms in thisattractive new 28 -page booklet, "The Ulti-mate in Sound." Also a new guide to "Pro-gressive Speaker Expansion." Free. (Univer-sity Loudspeaker)

Circle 174Tools for servicing are beautifully shown inthis multi -color 40 -page booklet which cov-ers alignment tools, screw and nut drivers,pliers and many special designs. Free. (Vaco)

Circle 175TV accessories, a great variety of them, areshown in 18 pages ready for notebook inser-tion. Included are attenuator, couplers, pixtube test and brightener, retrace eliminator,socket adapters and others. Free. (Vidaire)

Circle 176Communications antennas, mobile mountsand adapters are described in this 10 -pagebrochure. Free. (Ward)

Circle 177Generators for color TV, white dot linearityand rainbow, are presented in two bro-chures. Free. (Winston Electronics)

Circle 178Fusible resistor and temperature sensitivefilament resistors are cross-referenced withvarious TV makes in this 2 -sheet replace-ment guide of help to service techs. Free.(Workman TV)

Circle 179TV guy wire basic specs are presented inthis handy little 4 -page brochure. bee.(Wright Steel & Wire)

Circle 180Test instruments of direct interest to TV -electronic techs are effectively presented intwo useful booklets. First is a brand new24 -page catalog of test gear, including tubetesters, voltmeters, scopes, generators, etc.The second one, also well recommended, isa new 20 -page tube tester "book of facts."including theory and operation of dynamicmutual conductance testing. Latter harma lypriced at $1, but available to TECHNICIANreaders free. (Hickok)

Circle 181"Video Probe Meter" data explains how thisInstrument can test for signal loss, tracevideo from top of chassis, check audio andsync circuits, etc., simply by placing pickupcoil at various locations of chassis, and r..ad-ing meter. A simple yet clever device. Free.(Research Inventions & Mfg )

Circle 182Rectifiers and power supplies are listed withratings in this new brochure. Also includedare chokes and transformers. Free. (Techni-cal Apparatus Builders)

Circle 183Voltage adjustor and autothatic voltage con-trol for detecting and correcting low voltageon TV receivers are profitable devices forservice techs. Two bulletins provide all theinfo you need. Free. (Acme Electric)

Circle 184Capacitors, resistors, printed circuit units,and filters are presented, covering a full lineused by TV shops. Very good reference.Free. (Aerovox)

Circle 185Parts and equipment supplies, some 26,000items to be more exact. are described in thisdistributor catalog containing 324 pages, avirtual storehouse of the industry. Free. (Al-lied Radio)

Circle 186Wire and cable brochure, including data onJackets, conductors, dielectrics. RG/U no-menclature and a cable selector chart, is amoat worthwhile 34 -page reference. Free.(American Phenolic)

Circle 187TV transformer replacement guide, listingreplacements for over 7000 models and chas-sis for 116 TV manufacturers, is a veryuseful reference to have around the shop.Free. (Chicago Standard Transformer)

DON'T MISSany of the literature you want.Here's a tip - - -Tear out the inquiry card on page33, and place it on the page you'rereading. Circle the card numbers asyou decide on each item that youwish to receive.

Circle 188Resistors and hardware, including standoffs,fed-thru insulators, sockets and spaghetti,are shown in this brochure. A second itemof interest to techs are the revised sheets onfixed glass capacitors and glass resistors.Free. (Erie Resistor)

Circle 189Rectifiers are effectively presented in threebrochures for service techs. Titles include:"Diffused Junction Power Stacks," "Sele-nium Rectifier Design Data Guide," and"Diffused Junction Power Rectifiers." Free.(Federal Tel. & Radio)

Circle 190Printed circuit repair Information is com-piled in this 6 -page service manual of con-siderable interest to technicians. Booklet ispunched for looseleaf binder insertion. Free.(General Cement)

Circle 191Replacement transformers for TV, plusothers for hi-fi and industrial uses, are con-tained in this brochure which will provehelpful in the service shop. Free. (GramerHalldorsm)

Circle 192Picture tube replacements for TV are listedin this chart, with descriptions of each. Veryuseful when a big crt job is in the offing.Flee. (Haydu)

Circle 193Germanism diodes and power rectifiers arespecified in two bulletins covering varioustypes of applications of direct interest inservicing operations. Free. (InternationalRectifier)

Circle 1MVolume controls and resistors are detailedin two separate publications that every shopshould have at hand as component replace-ment references. Foremost is the 8 -page "QControl' catalog showing different shafts,resistance values and tapers. The other isan informative technical bulletin in moldedprinted circuits. Free. (International Resist-ance)

Circle 195Loudspeakers are presented in two bulletinswhich will definitely interest techs who doportable radio and hi -fl work. One is atechnical bulletin on a speaker used intransistorized radios. The other is a handy6 -page booklet showing the numerousspeaker kits available. Free. (Jensen Mfg.)

Circle 196Mast -mounting booster for VHF, called the"Desncwer Preamplifier" is described in this4 -page brochure. Free. (Jerrold)

Circle 197Solder. one of the most basic materials usedin electronic servicing, is described in litera-ture listing various lead -tin combinationsfrom small packages to 20 -pound spools.Free. (Kester Solder)

Circle 198Coils, transformers and related componentsfor auto radios and TV sets are listed inthese two separate replacement guides thatcontain so much valuable data, no techshould he without them. The 80 -page 1956Replacement Guide for coils cross-refer-ences 12,000 models and chassis over 155brand names. The Auto Radio ReplacementGuide covers all model cars. Free. (MeritCoil & Transformer)

Circle 199Sales and promotion aids described in thiswonderful booklet, "Ball -of -Fire BusinessBuilders," shows how you can obtain every-thing from cardboard cutout truck to givechildren on house calls to giant windowstreamers, every item designed to boost yourbusiness volume. Free. (Raytheon)

Circe 200Antenna towers and accessories, includingmasts and tubing, for all installations aredescribed in this folder. Everything youneed to get that antenna up in the air ispresented. Free. (Rohn Mfg.)

Circle 201Capacitors, with parts numbers cross-refer-enced with those of four other leadingmanufacturers of twist tab dry electrolyticTV replacements, are listed in this helpfulcatalog for TV servicing. Free. (Sangamo)

Circle 202Speakers, including two new woofers, aredescribed with technical specs in these cata-log pages ready for notebook insertion. In-cluded is a helpful little section on enclo-sure construction, with cabinet and vent di-mension table. Free. (Quam-Nicholls)

Circle 203Selenium rectifiers, new high temperaturetypes. are offered in this bulletin which in-cludes ratings and characteristics. Servicetechs will find this data of interest. Free.Sarkes-Tarzlan)

Cade 204Semiconductors, including diodes and tran-sistors of various types, are described inthese bulletins. Techs will be interested incurrent, voltage and temperature character -it tics. Fret. (Texas Instruments)


Circle 205Yokes, fly backs and transformers that areexact replacements are listed in these cross-reference guides for various set makers.Units are made to original specs, includinglead colors and mountings. Service shopsshould have this time -saving data at hand.Free. (Todd-Tran)

Cin.,e 206Antennas and rotators, their specs andprices, are offered in this booklet that's ahelpful reference for new and replacementinstallations. Free. (Trio Mfg.)

Circle 207Test equipment for radio, black & white TV.and color TV are nicely presented in this16 -page brochure. Free. (Triplett)

Circle 208Cartoon sales aid booklet tells your customerand prospects about your training and re-liability in some very easy to understand 16pages. Good for educating your customersthe right way. Free. (Tung -Sol)

Circle 209Electronic kits, including test equipment.hi -ft and other electronic products, areshown in this 50 -page booklet which willinterest TV -electronic techs by its broadcoverage of different products. Free. (Heath)

Circle 210Electronic parts, including antennas, capaci-tors. resistors, vibrators, transformers,speakers. hardware, noise suppression ma-terial and auto radio controls, are colorfullyillustrated in 7 informative bulletins. Free.(United Motors)

Circle 211Test instruments, a complete line of themfor servicing TV, communications and in-dustrial electronic gear, are shown in thisbrochure sure to interest service techs. Free.Weston)

Circle 212TV antennas with a special element to as-sure good reception are described in thisfolder. Free. (Winegard)

Circle 213"Television Almanac" of antennas, mountsand accessories presents the lowdown onvideo skyhooks, lightning arrestors andother related products. This brand new 1956reference catalog is attractively illustrated.You'll want one. Free. (JFD Mfg.)

Circle 214Color TV converter question and answer 6 -page folder, just off the press, tells you howmuch the converter costs, which sets itworks on, what device consists of, and manyother facts you've no doubt been wonderingabout. Free. (Color Converter)

Circle 215Battery replacement guides, one an 8-pagerand the other a large double sheet, list radiomakes and models with their battery re-placement types, and cross reference thiscompany's stock numbers with those ofNEDA and 13 other makers. Free. (Eveready-National Carbon)

Circle 216Semiconductor diodes, including germaniumand silicon types for TV and general appli-cation, are presented with specs and physicaldimensions in this informative 8 -page bro-chure. Of notable interest is the 2 -page in-terchangeability reference chart. You shouldhave this one in your notebook. Free. (Ray-theon)

Circle 217TV antennas with versatile design for metro-politan and fringe reception are presentedin literature telling you about the perform-ance of antennas included in this manufac-turer's line. Free. (Snyder Mfg.)

Circle 218Capacitor tester, what it will do for you.how it works and other useful technical in-formation to improve your servicing, arecontained in this reprint of an interestingtechnical article. Free. (TeleTest Instrument)

Circle 219Battery interchangeability chart, coveringover 80 type designations cross-referencedfor 16 manufacturers, is an excellent aid inspeeding portable radio servicing. No needto hunt for the right battery. Just look itup and make the replacement. Free. (Gen-eral Dry Batteries)

FREE SUBSCRIPTIONS

Circle 220"The Capacitor" is a regular monthly maga-zine, generally running between 20 and 24pages. It contains several pages of technicalmaterial on circuits components or equip-ment, followed by the unique "TradingPost" section where free ads from readersnote technical equipment wanted, for saleor offered to swap. Free. (Cornell-Dubilier)

Circle 221"Confidential Dealer Bulletin" that is pub-lished practically every month covers thetechnical and product aspects of variousaudio devices such as turntables and ampli-fiers. Free. (Fairchild Recording)

Circle 222"Techni-Talk" is a bimonthly publicationfor radio -TV servicing. It contains practicaltroubleshooting short cuts, discussions ofcircuit operations and helpful bench notesthat every tech will value. Free. (GeneralElectric)

Circle 223"Sylvania News" is a most valuable monthlypublication which may often run about 12pages. It contains service news, a very in-formative technical section, and helpfulmerchandising material. Also incipded arenew tube spec sheets as they becofile avail-able. Get on this list. Free. (Sylvania)

LITERATURE FROMMANUFACTURERS

(AT CHARGE)Circle 224CElectrolytic replacement guide for all capaci-tors of this type used in TV sets containscross-reference with manufacturer's partsnumbers. It's brand new and up-to-date. Allmakes from Admiral to Zenith. 25t. (Aem-vox)

Circle 225CSound systems and what you should knowabout them are thoroughly discussed in this24 -page booklet. Everything from operatingfundamentals to system installation is cov-ered. 10t. (David Bogen)

Circle 226CTV service binder, in easel form to standup on the shop bench, provides quick refer-ence to company's sets with charts and data.Supplementary "Serv-U-Facts" charts issuedto binder owners without extra charge. Also,free subscription to the bimonthly "Tech -Flash" which describes technical aspects ofsets and servicing is included. $3.00. (Cape-hart -Farnsworth)

Circle 227CControl guide, pocket edition, cross refer-ences resistive control replacements withradio. TV and audio manufacturers' partslistings. Issued quarterly. This data packedhandbook, 96 pages last issue, should be atthe fingertips of every tech. 200. (Centralab)

Circle 228CColor code calculator for resistors & tubularceramic capacitors is a slide rule type ofdevice with 6 rotating discs. Just set thediscs to the color markings and the compo-nent values are read directly. Helps preventmistakes, saves time. 250. (Centralab)

Circle 229C"Service News" subscription plan includes,in addition to this excellent technicalmonthly publication which discusses circuitsand servicing in 8 -pages, chassis schematicsand time saving "Fix Faster" booklets. Thisreference literature service is worth its an-nual cost many times over. $3.00. (DuMont)

Circle 230CService data book, 1956 edition, is a valuableservicing aid, containing schematics, align-ment procedures and parts lists for all of themanufacturer's TV chassis from 1946 to1955. in chronological order. Over 80 giantsized pages. $2.25 (DuMont)

Circle 231CSelenium rectifier handbook provides 80pages of circuit applications, dimensionaldiagrams and characteristic curves for TV.radio, audio. mobile and industrial. Specialsection gives testing and troubleshootingdata. Very informative. 50t. (Federal Tele-phone & Radio)

Circle 232CSelenium rectifier replacement guide is alarge -sized 52 -page cross-reference of TVand radio sets, listed by make and model.together with manufacturer's part numberand equivalent replacement. Popular andhard -to -find brands are both included inthis valuable work. 50t. (Federal Telephone& Radio)

Circle 233CSpeaker enclosures, with detailed plans andinstructions on building them, either fromkits or plain lumber, are shown in 7 differ-ent booklets. Model 1BI. $1.50; models 1B2to 6, $1.00; 1B7, $.75 (Electro-Voice)

Circle 234CTube handbook presents the characteristicsof receiving. TV pix and special purposetubes, as well as germanium diodes, withbasing diagrams, in 192 data filled pages.This is one of the standard industry refer-ences found in shops across the country.500. (General Electric)

Circle 235CColor TV test equipment and how to use itin receiver servicing is clearly and simplydescribed in this 14 -page booklet giving re-sponse curves and related data. 500. (Gen-eral Electric)

Circle 236CTV service guide, containing 98 -giant -sizedpages, provides schematics, parts lists, tubeand trimmer locations, and photographic in-dex of models in company's line. Covers re-ceivers made from 1946 to 1953. Volume 1.$1.50. (General Electric)

Circle 237CTV service guide, similar to above #236C.covers sets made since 1953. Volume 2,$1.00. (General Electric)

Circle 238C*.Fl speaker system manual with 18 enclo-sure designs which you can build yourselfare covered in this highly desirable 36 -pagebook. Complete drawings for cabinet workplus easy -to -follow instructions are featured,with interesting data on kits. 500. (JensenMfg.)

Circle 239CAudio technical monograph series providesthe technician with a wealth of importantinformation. No technician can honestlycfaim to understand audio reproduction fullyunless he comprehends the data in thesepublications. A real reference work. "Loud-speaker Frequency -Response Measure-ments," 15 pages. No. 1, 2.54. (Jensen Mfg.)

Circle 240CAudio series similar to above #239C. "Im-pedance Matching and Power Distribution inLoudspeaker Systems," 19 pages. No. 2, 254.(Jensen Mfg.)

Circle 241CAudio series similar to above #239C. "Fre-quency Range and Power Considerations inMusic Reproduction," 14 pages. No. 3, 250.(Jensen Mfg.)

Circle 242CAudio series similar to above #239C. "TheEffective Reproduction of Speech," 14 pages.No. 4, 250. (Jensen Mfg.)

Circle 243CAudio Series similar to above #239C. "HornType Loudspeakers," 16 pages. No. 5, 25t.(Jensen Mfg.)


Circle 244C"Servicing by Signal Substitution" is thename of this 92 -page manual describing theuse of the signal -marking generator in thesystematic approach to service and align-ment problems. This book can be a big steptoward becoming an advanced technician.Among the many things you can accomplishquickly is i-f gain -per -stage tests, locateshorted or open coils, pick out hard -to -findopen capacitors, and lots more. 400. (Pre-cision Apparatus)

Circle 245CSine -square wave generator manual describesthe instrument in great detail, followed bytesting techniques, interpretation of scopewaveforms, and procedures for determiningthe performance of audio and video ampli-fiers. 20 pages. 250. (Precision Apparatus)

Circle 246CSweep signal generator manual explains theprinciples of operation and setup procedure,followed by very detailed descriptions ofhow you go about aligning TV, FM andother high frequency receivers. The 32 pagescontain a helpful section on scope waveshapeanalysis. 500. (Precision Apparatus)

Circle 247CWldeband oscilloscope manual, with 20 datapacked pages, describes scope functions andoperation, followed by applications in FMamplifier alignment, color TV troubleshoot-ing. servicing buzz, sync circuits, and more.50e. (Precision Apparatus)

Circle 248CReceiving tube manual is one of the stand-ard industry references found in many shopsacross the country. This important 336 -pagebook lists practically every tube techs mightcome across. Theory, complete characteris-tics, curves, basing, etc., are given. It's amust. 60e. (RCA)

Circle 249CPicture tube replacement directory has 16pages divided into two parts. First partgives ratings and characteristics of 60 types.Second part lists replacements for more than150 industry types. Very useful. 20e. (RCA)

Circle 250CReceiving tube reference for AM, FM andTV has 28 up-to-date data -packed pagestube characteristics and socket connection".with a special section for kinescopes. Basingdiagrams are shown by tube type. 15e.(RCA)

Circle 251CTV servicing publication, consisting of com-pilation of practical technical articles ln.48pages. provides much useful data on align-ment, deflection troubles, agc and humproblems, and much more. A 12 -page sup-plement is called "Troubleshooting ToughSets or Dogs," and offers many time savinganalyses. 500. (RCA)

Circle 252C"Practical Color Television for the SeigelceIndustry" is the name of this important itreadable 84 -page book which laysgroundwork for your entrance into thegrowing color field. Everything you wantto know from basic circuitry to testingtechniques is covered. $2.00. (RCA)

Circle 253C"Large Screen Color Receiver" is 36 -pagesupplement to above #252C, which providesdetailed emphasis, with complete circuit, onthe operation of the 21CT662. $.75. (RCA)

Circle 254CTV service parts guide, listing originalmanufacturer's replacements, has 16 pagesof stock numbers cross-referenced by chassisnumber. All of this set maker's models from1946 to 1954 are covered. Very helpful ifyou're looking for a replacement of a com-ponent like a transformer that's not readilyavailable. 15e. (RCA)

Circle 255CReactance slide rule has 5 separate scaleswhich enable you to solve resonant fre-quency and reactance problems quickly and

easily. No need to fuss with formulas andarithmetic. 500. (Shure Bros.)

Circle 256C"1001 Uses for the Model 260 Volt-Ohm-Milliammeter" is the title of this 50 -pagehandbook which discusses vom applicationsin TV, broadcasting, communications.schools, garages, aircraft, industrial plantsand many others. $1.00. (Simpson)

Circle 257CCapacitor indicator slide rule provides quickway to decipher color codes on moldedpaper tubulars. Merely by turning dials toproper colors, it shows, capacitance, toler-ance and voltage. 15f. (Sprague)

Circle 258CCeramic capacitor slide rule easily deter-mines values of ceramic capacitors whichcan be connected in parallel to equal de-sired intermediate temperature coefficientsof a specific capacitance. 150. (Sprague)

Circle 259C"Scope Connections" is the title of this ex-tremely helpful booklet covering everythingfrom elementary data on scope function toinformation of determining overall videoi-f response. $2.00. (Triplett)

Neither snow nor rain nor gloomnight will stop the postman frombringing you the literature youwant

IF

of

you promptly circle the numbersand mail the card on page 33

ACT NOW!

Circle 260CTechnical tube manual, a most valuablestandard reference book, contains completedata on all TV picture and receiving tubes,plus material on rc amplifiers. use of char-acteristic curves and much more. The manyhundreds of pages are enclosed in a speciallooseleaf binder which enables you to insertadditional free data sheets that are sentperiodically as new tubes become available.A gold mine of tube info. $2.00. (Sylvania)

Circle 261C"Servicing TV Receivers" has over 150 pagesbound with metal spiral. After describingconsiderations in servicing various stages inthe set, it presents dozens of photos ofpicture tube patterns caused by varioustroubles, plus explanations of symptom,analysis and procedure. Separate section ontroubleshooting, alignment, etc. $2.00. (Syl-vania)

Circle SaC"Television Receiver Tube ComplementBook" is the title carried on this 120 -pagerwatch lists over 100 makes and 3500 modelsof sets a few years old, together with thetypes of tubes used in each set. Special list-ing of set maker trade names and addressesis a good reference. 75f. (Sylvania)

Circle 263C"28 Uses for Junction Transistors" has over50 pages, a real manual of practical appli-cations. It covers theory, amplifiers, oscilla-tors. controls and transistorized instruments.Circuits explanations and response chartsare all given. 250. (Sylvania)

Circle 264C"Crystal Diode Circuit Kinks" has more than40 pages describing 40 practical circuits usinggerman.um diodes. Among them are volt-meters, probes, limiters, modulators. gen-erators and many others of considerable:nterest to techs. 25e. (Sylvania)

Circle 265CTube base diagram book in handy vestpocket size blueprints more than 350 basesfor over 1300 tubes. Excellent quick refer-ence. 750. (Tung -Sol)

Circle 266CTV business forms, including bills andclaim checks, stick -on service charts, ac-count sheets, call tickets, service records.service contract forms and other items forkeeping your business shipshape. Sampler10f. (Oelrich)

FREE INFORMATION ON BOOKS(If you want to order book, enclose amountrequired, and state listing number and title.)

TECHNICAL BOOKSCircle 267"TV & Radio Tube Substitution Guide." 22pages.. Paper cover. 500. Suggested directtube replacements, using types with similarcharacteristics for same sockets, is helpfulwhere identical replacements are not ob-tainable. Receiving and pix types. Moredata free. (Cisin)

Circle 268"Repairing Record Changers," by E. Ecklund.278 pages. Hard cover. $5.95. Practical man-ual on repairing mechanical elements suchas motors, drives and tripping mechanisms.Also pickups and needles. Magnetic recorderrepairs included. More data free. (McGraw-Hill)

Circle 269"Practical Radio Servicing," by W. Marcus& A. Levy. 565 pages. Hard cover. $8.50.Complete explanation of how radio set isconstructed, how it functions, what can gowrong, how to find trouble and remedy it.More data free. (McGraw-Hill)

Circle 270"Color Television Fundamentals," byKiwer. 312 pages. Hard cover. $6.00. Exten-sive coverage of basic color TV principlesand operation of receivers. Shows how toinstall and service color sets. More datafree. (McGraw-Hill)

Circle 271'Television Fundamentals,' by K. Fowler &H Lippert. 524 pages. Hard cover. $7.00.Simple and authoritative treatment of basicprinciples. Description of elements in re-ceiving system, from antenna to pix tube.More data free. (McGraw-Hill)

Circle 272'Transistors: Theory and Applications," byA. Coblenz & H. Owens. 313 pages. Hardcover. $6.00. This reference discusses bothsilicon and germanium transistors. how theywork, how they are made, and how they areused. More data free. (McGraw-Hill)

Circle 273"Radio Operating Questions and Answers,"by J. Hornung & A. McKenzie. 12th ed.


571 pages. Hard cover. $6.00. Specific in-formation on radio law, operating practiceand theory for those studying to pass FCCcommercial radio exams of various licensegrades. More data free. (McGraw-Hill)

Circle 274'Theory and Design of Television Re-ceivers," by S. Deutsch. 550 pages. Hardcover. $7.50. Physical explanation for thebehavior of various TV receiver circuits,and discusses their practical design. Moredata free. (McGraw-HU1)

Circle 275"Advanced Television Servicing Tech-niques," by RETMA. Text: 176 pages. Softcover. $3.60. Lab book: 32 pages. Soft cover.95g. Complete industry -approved servicingcourse designed to raise technical skill ofprofessional techs. Broad coverage includestest equipment, servicing various sectionsof set, antennas and much more. More datafree. ( Rider)

Circle 276"TV Field Service Manuals with Tube Lo-cations," by H. Alsberg. 4 volumes. Softcover. $9.00. Covers symptoms, check pointsand many illustrations of set models over7 years from 1947. Alphabetical coverage ofmakes from Admiral through Hoffman. Moredata free. (Rider)

Circle 277'TV Manufacturers' Receiver TroubleCures." 7 volumes, over 115 pages each.Soft cover. $1.80 ea. Listed by manufacturerand set model, books give corrections formost faults. Each cure is factory authorized.Volumes cover different set makers. Moredata free. (Rider)

Circle 278"Picture Book of TV Troubles," by RiderStaff. Vol. 1, 80 pages, $1.35. Vols. 2, 3. 4,96 pages, $1.80. Faulty pix tube patterns areintegrated with scope waveforms for quicktrouble diagnosis. Vol. 1, horizontal afc,oscillator circuits. Vol. 2, vertical sweep.deflection. Vol. 3, video 1-f, amplifiers. Vol.4, agc circuits. More data free. (Rider)

Circle 279"TV Troubleshooting and Repair Guide-books," by R. Middleton. Vol. 1, 204 pages.soft cover, $3.90. Vol. 2, 160 pages, softcover. $3.30. Down-to-earth servicing datain Vol. 1 includes alignment, sync troubles.video circuits, high voltage, and instrumentuse. Vol. 2 covers front ends. i-f strips,audio and horizontal circuits. All practical.More data free. (Rider)

Circle 280"How to Use Meters," by .1. Rider. 144 pages.Soft cover. $2.40. All basic info you needon vom's vtvm's, meter movements. etc.Adapting meters for audio, r -f. Applications.More data free. (Rider)

Circle 281'TV Sweep Alignment Techniques," by A.Liebscher. 128 pages. Soft cover. $2.10. Thewhole story on alignment. TV sets, video,i-f. sound, with actual sweep curves, UHFdata. Time -saving methods. More data free.(Rider)

Circle 282"How to Install TV Antennas," by S. Mar-shall. 128 pages. Soft cover. $2.50. Some-times called the "antenna bible." Coversprecautions, erecting masts, fringe areas,antenna types, and masonry work. Moredata free. (Rider)

Circle 283"How to Troubleshoot a TV Receiver," byJ. Johnson. 128 pages. Soft cover. $1.80. Onan intermediate level, book uses step-by-step guide to tell how to approach serviceproblem, interpret symptoms and make ad-justments. More data free. (Rider)

Circle 284"How to Locate and Eliminate Radio and TVInterference," by F. Rowe. 128 pages. Softcover. $1.80. Covers interference sources,locating equipment, filters, appliances, andelimination techniques. More data free.(Rider)

Circle 285"Introduction to Color TV," by M. Kaufman& H. Thomas. 144 pages. Soft cover. $2.10.Down-to-earth explanation explains colorphenomena, the NTSC system, color re-ceivers and pix tubes. Important referencefor growing new medium. More data free.(Rider)

Circle 286"How to Service Tape Recorders," by C.Tuthill. 160 pages. Soft cover. $2.90. The re-cording heads, electronic circuits and drivemechanisms are all covered. Practical ex-amples of troubleshooting recorders. Shoprequirements noted. More data free. (Rider)

Circle 287"How to Install anmil Service Auto Radios,"by J. Darr. 128 pages. Soft cover. $1.80. Prac-tical, detailed instruction for all types ofauto radios, not schematics. Where to runlead-ins, how to install. antennas, eliminatenoise and test vibrators.Freventative main-tenance. More data free. (Rider)

Circle 288"Fundamentals of Transistors," by L. Krug -man. 144 pages. Soft cover. $2.70. Techs willbe running across more and more transistorservicing jobs. Book clearly tells how unitsoperate, different circuit applicationVampli-tiers and oscillators. More data free. (Rider)

KEEP IT

CLEAN, FELLOWSwhen you circle numbers on page

33 DO THIS

797 (..791 799

NOT THIS

7 9 9

to make sure you get the literatureyou really want!

Circle 289"Radio and Television Receiver Circuitryand Operation," by A. Ghirardi & J. John-son. 669 pages. Hard cover. $6.50. Compre-hensive basic work covers everything fromamplitude modulation through TV sets andrecord changers. Non -mathematical. Gener-ous glossary of terms. More data free. (Rine-hart)

Circle 290"Radio and Television Receiver Trouble-shooting and Repair," by A. Ghirardi & J.Johnson. 820 pages. Hard cover. $6.75. Start-ing with a careful analysis of components,this giant reference goes through all detailsof troubleshooting many different kinds ofreceivers. 417 illustrations. More data free.(Rinehart)

Circle 291"Practical Television Servicing," by J. John-son & J. Newitt. 344 pages. Hard cover.$4.00. In addition to r -f and TV funda-mentals, major emphasis is on repair prob-lems, including video amplifiers, sweep,power supply, and antennas. Alignment andservice hints included. More data free.(Rinehart)

Circle 292"Basic Electronic Test Instruments," by R.Turner. 171 pages. Hard cover. $4.00. Over60 instruments, from simple meters to specialpurpose bridges, are carefully described.Operation described in easy to understandsteps. More data free. (Rinehart)

Circle 293"Radio Servicing Course." $2.50. Book laidout like correspondence course, with self-testing questions, covers fundamentalsthrough practical repair problems and useof instruments. More data free. (Supreme)

Circle 294"Television Servicing Course." $3.00. Followscorrespondence course format. Has lessonson circuits, faults, adjustments, short-cuts,UHF, alignment, antennas and troubleshoot-ing. More data free. (Supreme)

Circle 295"Simplified Radio Servicing by ComparisonMethod." 92 pages. $1.50. How to make re-pairs using only simple test gear. Over 1000practical service hints. Troubleshooting blue-prints. More data free. (Supreme)

Circle 296"Most Often Needed 1955 Television Servic-ing Information." $3.00. Also "Additional1955 Television Servicing Information."$3.00. Twin volumes based on factory dataincludes circuit diagrams, waveforms, voltagecharts, production changes and other servic-ing information. More data free. (Supreme)

Circle 297"Most Often Needed 1955 Radio Diagramsand Servicing Information." $2.00. This 15thvolume in the series covers schematics. partslists and other material for home and autoradios and changers. More data free.(Supreme)

Circle 298"High Fidelity Techniques," by J. Newitt.512 pages. Hard cover. $7.50. Complete treat-ment of principles and practices of modernsound systems. Specific examination ofspeaker, enclosures. amplifiers, recorders andother equipment. More data free. (Rinehart)

Circle 299"License Manual for Radio Operators," byJ. Johnson. 448 pages. Hard cover. $5.00.Subtitled "A Guide to FCC Examinations."this book prepares you for obtaining yourcommercial operator's license. 32 -page sup-plement included to bring manual up todate. More data free. (Rinehart)

Circle 300"Electric Appliance Service Manual," by W.Gabbert. 390 pages. Hard cover. $5.00. Forthe tech who wants to repair home appli-ances. Covers test instruments, irons, toast-ers, motors, ranges. razors, lamps and manyothers. More data free. (Rinehart)

Circle 301"Welaides," Soft cover. Plastic bound, 11 x17"! pages. $2.50 per volume. Service manualsinclude circuits, chassis views and servicedata for entire TV set line, by manufacturer.18 of top brands are now available. Moredata free. (Wallace)

Circle 302"Principles of Radio," by K. Henney & G.Richardson. 655 pages. Hard cover. $6.75.Comprehensive explanation of fundamentalsfor truly understanding radio, communica-tions. FM, radar and TV. More data free.(Wiley)

Circle 303'Transistor Audio Amplifiers," by R. Shea.219 pages. Hard cover. $6.50. Advanced dis-cussion contains specs. performance, curvesand specific design, with practical applica-tion strayed. More data free. (Wiley)

Circle 304"Elements of Sound Recording," by J.Frayne & H. Wolfe. 686 pages. Hard cover.$11.00. This is a complete presentation ofthe theory and practice of all phases of therecording art. More data free. (Wiley)

Circle 305"Elements of Television Servicing," by A.Marcus & S. Gendler. 606 pages. Hard cover.S6.95. Volume on a technical level tells youpractically everything you need to knowfor competent servicing. Everything frombasic TV signal to troubleshooting by photosymptoms. Excellent coverage of color TV.More data free. (Prentice -Hall)


BUSINESS BOOKS

Circle 306"How to Run a Small Business," by J.Lasser. Revised by S. Prerau. 332 pages.Hard cover. $4.95. Gives rules, methods,pointers and do's and dont's for profitablebusiness operation. Problems include man-agement, finance, accounting. insurance andsales. More data free. (McGraw-Hill)

Circle 307"Successful Labor Relations for Small Busi-ness," by J. Black & G. Piccoli. 425 pages.Hard cover. $6.00. Shows how to avoid labortrouble by understanding industrial rela-tions. Tells what to do when faced withrepresentation election, strike or unfair laborpractice charge. More data free. (McGraw-Hill)

Circle 308"Selling Your TV -Radio Service," by Gen-eral Electric Tube Dept. 64 pages. Soft cover.$1.00. Tells how to get more customers, useof proper advertising, direct mall techniques,window display gimmicks and many otherprofit -making ideas. More data free. (Rider)

FREE INFORMATION ON HOMECORRESPONDENCE COURSES

Circle 309Master course. 62 lessons and examinationsplus 3 comprehensive exams. $175.00. Coversbasic and intermediate math and electronictheory. Complete preparation for FCC examsthrough 1st class phone, which opens manyopportunities in commercial radio. Materialalso essential for electronic maintenance.More data free. (Cleveland Inst. of RadioElectronics)

Circle 310Smith's Advanced Radio and Communica-tion Engineering. 75 lessons and exams.$235.00. College level course includes maththrough calculus, network analysis, filter de-sign, circuits, antenna design and propaga-tion. Excellent for techs ready to step upto engineering level. More data free. (Cleve-land Inst. of Radio Electronics)

Circle 311Home Training in Television -Radio -Elec-tronics. 100 lessons from 24 to 28 pages.$97.50 for 3 mo. payment; $108.00 for 12mo. payment; $119.50 for 24 mo. payment.Up-to-date course teaches how to use testequipment and make repairs to become aservice tech. Subjects include UHF andcolor TV. Student sets own pace. More datafree. (Coyne School)

Circle 312Radio -Television -Electronics Course I. 20study groups and 15 kits for construction.$231.50. For the beginner with no preytraining. Kits include multimeter, r -f sgenerator and 6 -tube superheat. More tofree. (RCA Institutes)

Circle 313Television Servicing Course II. 10 studyunits. $90.00. Optional TV construction kit,$130.00. For students with prior backgroundin radio servicing. More data free. (RCAInstitutes)

Circle 314Color Television Course. 3 study eitimps of3 lessons each. $27.00. Covers all phases ofcolor servicing techniques. More data free.(RCA Institutes)

Circle 315Radio -Television Plan 1. 10 training unitsfrom $14.00 to $18.50 ea.. payable with eachunit. For beginner desiring practical train-ing in radio. More data free. (SprayberryAcademy)

Circle 316Radio -Television Plan 2. 25 training unitscombining plans 1 and 3. from $12.00 to$29.50 ea.. payable with each unit. Completecourse from beginner level to advanced.More data free. (Sprayberry Academy)

Circle 317Radio -Television Plan 3. 15 training unitsfrom $14.50 to $32.00 ea.. payable with eachunit. Advanced course for experienced radiotechs wishing practical TV training. Moredata free. (Sprayberry Academy)

Circle 318TV Service Course. 14 weeks. $75.00. Cancomplete course at students pace. Individualconsultation by correspondence. Subjects in-clude antennas, test patterns, parts ..denti-fication and quick checks. More data free.(Video Specialties)

FREE INFORMATION ON PRODUCTSADVERTISED IN THIS ISSUE

Circle 319Barry Electronics: Electron tubes.

Circle 320Blonder -Tongue: 8 -line master TV distribu-tion amplifier.

Circle 321CBS-Hytron: Receiving & pix tubes.

Circle 422Centrelab: Volume control and switch kit.Control replacement guide (20t).

Circle 323Century Electronics: CRT "testivator" in-strument.

Circle ;24Channel Master: "Glide-o-Matic" indoor TVantennas, standout insulators.

Circle 325Chemical Electronic Engineering: "Hush"TV tuner cleaner.

Circle gasCleveland Institute: Study for FCC licenses,communications.

Circle 327Cornell-Dubilier: "Cub" molded tubjlar ca-pacitors.

Circle 328DuMont Labs.: TV pix tubes.

Circle 329Electro Products Labs.: Battery eliminators,power, supplies.

Circle 330Erie Resistor: "Ceramicon" TV service kit.

Circle 331Federated Television: Tubes, filter conden-sers, rectifiers.

Circle 332General Dry Batteries: Portable radio re-placement batteries.

Circle 333Grantham School: Study for FCC license.

Circle 334Heath: Oscilloscope and sweep generatorkits.

Circle 335Hickok: "Burnout -proof" VOM.

Circle 336International Rectifier: "Airkore" seleniumrectifiers.

Circle 337International Resistance: Power resistor,"Resist -O -Card" assortment.

Circle 338Jones & Laughlin: "Perma-Tube" antennamasts.

Circle 339Jensen Industries: Phonograph needles.

Circle 340Kenwood Engineering: "Kenco" mounts,wall brackets.

Circle 341Hester Solder: "Resin -Five" core solder.

Circle 342Littelfuse: Electronic fuses.

Circle 343'Mallory: Electrolytic capacitors, vibrators.controls.

Circle 344McGraw-Hill: Industrial electronic servicingbooks.

Circle 345Merit CoB & Transformer: Yokes, universaltransformers & coils.

Circle 346Microtran: Voltage adjusters & boosters.

Circle 347Motorola. Transistor car radios.

Circle 348Oxford Electric: Replacement speakers.

Circle 34EPermo: "Fidelitone" phono needles.

Circle 35$Pyramid Electric: Electrolytic and papercapacitors.

Circle 351Quam-Nichols: Universal TV focalizer unit.

Circle 352Radiart: TV antenna rotators.

Circle 353RCA: batteries for transistorized radios.seleniurr rectifiers, receiving tubes, serviceparts.

Circle 354Radio Merchandise Sales: Television anten-nas.

Circle 3E5Raytheon: Aluminized pix tubes.

Circle 3f.,6Research Inventions & Mfg.: Video probemeter.

Circle 357John Rider: Service referencebooks.

Circle 358Sarkes Tarzian: High density rectifiers.

Circle 339South River Metal Products: Adjustablesteel wall bracket.

Circle 360Sprague: "Salute to Independent" windowdisplay

Circle 361Sel-Son: CRT substituter instrument.

Circle 362Simpson Electric: 7" dual bandwidth color -scope.

Circle :63Snyder: TV torque-tenna with interceptordiscs.

Circle 364Sylvania: Electronic tubes.

Circle 365Technical Appliance: "Trapper" TV anten-nas.

Circle 366Thompson Products: "Superotor" antennarotator.

Circle 367Todd-Tran: Yoke. flyback and transformerreplacements.

Circle 368Triad Transformer: Replacement flybacks.

Circle 369Tung -Sol: Receiving and aluminized pixtubes.

Circle 370Vokar: Auto radio vibrators.

Circle 371Wen Products: "Quick -Hot" soldering gun.

Circle 372Westinghouse: "Reliatron" electron tubes.


Selecting & Installing

Two -Way Radio SystemsConsider Terrain, Area Coverage and Operating Frequency

JACK DARR,

Ouachita Radio -TV Service

Satisfactory performance and lowmaintenance costs are the two ma-jor factors to be considered whenplanning the installation of any two-way radio system. This may beachieved only by the most detailed,painstaking planning of the entiresystem, well in advance. Power re-quirements for equipment, trans-mitter locations, antenna types, andmany other details must be workedout well before the actual construc-tion of the system is begun, if manyfuture troubles are to be avoided.

The primary consideration, ofcourse, is the coverage of the sys-tem. This may operate entirelywithin the city limits, or may be allover two or three counties, and theterrain may range from flat to hillyor even mountainous.

Frequency assignments are madeby the FCC according to the type ofservice: power, marine, highwaytransport, etc. Power utilities, forinstance, are assigned in two fre-quency bands, 25-50 mc and 152-174 mc. The system will be assigneda specific frequency in the band, ac-cording to local conditions. Our localunit for the Rural Electrification Ad-ministration, as an example, was as-signed to 153.71 mc, because therewere already several REA systemsworking on that frequency in ourarea. Thus, the mobile units of one

system can work with base stationsof another system, in emergencies.

For a complete listing of all fre-quency assignments, get a copy ofthe FCC Rules Governing IndustrialRadio Service, Part 11. These may beobtained from the Superintendent ofDocuments, Washington 25, D.C., forfifteen cents, and you must have acopy of them in the files, anytray, tooperate the system.

Let's assume you will be workingin the high band, 152-174 mc. Thismakes antenna sizes smaller, butposes serious problems as to cover-age, due to shadow effects in moun-tain terrain. The lower band willgive much better long-distance serv-ice, if your system calls for thi§.

Choosing Antenna Site

Let's assume also that the ter-rain is mountainous, so as to con-sider the worst possible conditions.The selection of an antenna site forthe transmitter will determine theperformance of the entire system,much more so than even the poweroutput. The primary requirementfor this high band, of course, isheight. Sufficient altitude will enableyou to "shoot down" into valleys,behind mountains, etc., into placeswhich would otherwise be "deadspots," of which you'll find plenty,anyhow.

In mountainous country, there willprobably be hills near enough to the

Fig. 1-Remote-controlled transmitter -receiver located on mountain side to gain height.

POWER ANDCONTROL WIRES

CONTROL -UNITDOWNTOWN

OFFICE

ANTENNA

TRANSMITTER -RECEIVER

,

II

STAVON

(At'gRAE.,---- TENNA I

STATION'S*

181!OMNIDIRECTIONAL)

ANTENNA

\\..\\.` -- -

- AREA TO BE COVERED- - - COVERAGE OF

- COVERAGE OF 'Fr

Fig. 2-Choice of the antenna type dependson Its location within the area to be covered.

town to enable the use of one ofthem for the antenna site. If not,then the only answer is a very talltower. By using the hill to gain thealtitude, many problems are avoided.

Accessibility of power supply linesand telephone lines is another factor.All commercial base -station trans-mitters are capable of being re-motely controlled: only one pair ofwires is needed. These will carryaudio currents for the receiver, mod-ulate the transmitter, and in additionearry the small dc voltage that keysthe transmitter, through a very sen-sitive relay. See Fig. 1.

If it is at all possible to constructthese control lines yourself, by allmeans do so: the only other alterna-tive is to rent them from the tele-phone company, and the rentalcharges over a period of years willpay for the cost of the line. This isespecially feasible if the owner ofthe radio system is a power utility,such as REA.

Next factor to be considered, hav-ing se1ected a hilltop site, is the cov-erage available from there. If it is atall possible, actual transmissionsshould be made, using portableequipment, operating on or near theassigned frequency, so as to get anidea of the actual terrain covered.This is sometimes very differentfrom the computed values, but usu-ally is much greater than estimated.If this is not possible, a terrain map,preferably a contour map, should

(Continued on page 61)40


Corner

Difficult Service Jobs Described by Readers

CRT Causes Vert. FaultThis malfunction occurred in an

RCA chassis KCS92 just a few daysafter the set had been installed. Abad case of vertical nonlinearity thatcould not be cleared up in the homecaused the set to be brought intothe shop.

A voltage check in the verticaloscillator and output stages dis-closed a low plate voltage in theoutput stage. There was only 90 voltspresent although (see circuit) 155volts is normal, supplied from theboosted B -plus through two drop-ping resistors and the height con-trol. A check of the tube and allcomponents in the plate and grid cir-cuits for shorts, changes in value,etc., proved unproductive. With allnormal possibilities eliminated, thesearch began for the less obviousrelationships or connections.

More careful observation of theschematic and set wiring discloseda lead running from the top of theheight control, through the set'sbuilt-in phonograph switch, to thefirst anode (pin 10) of the 21AMP4picture tube. In effect, the B -plusboost voltage was being supplied tothe pix tube and the height controlfrom the same point.

It then became obvious that first -anode voltage would be insufficient

also. Instead of 450 volts we had 130volts. However, the possibility ofany defect in the picture tube wasstill ;considered remote, since thepicture appeared to be of normalquality. Nevertheless, a resistancecheck of crt connections showed 300k leakage between the first anodeand the filament. Presumably, thisleakage occurred between the leadsto tlaese electrodes in the tube base.

It was decided not to tamper withthe base, since the picture tube wasin warranty. Replacement of the bigtube restored voltages and perform-ance to normal, with acceptable ver-tical linearity now attainable.-Ber-nard E. Hollembeck, Vandalia, Mo.

Wrong CluesThe customer's original telephone

complaint on this Admiral 21A3 wasthat there was a horizontal lineacross the screen instead of a fullraster before her husband hadstarted fooling with the set. Nowthere was no picture at all. Also,would we please put the top backon a tube that her husband hadpulled off. The sound was okay, sheassured us.

When we arrived, she informed usthat her two children were sleepingand asked us to please keep the setquiet for that reason. Accepting her

Though this crt appeared to be okay, leakage affected the vertical output stage.

V. OUTPUTX FORMER

V2 12AU7V DISCHARGE

V. UN. 4ow,CONTROL

B

1.5 MV HOLD

90V. INSTEADOF I55V.

5MHGT.

470K

270 K

300KLEAKAGE

B+ BOOST I500V)

reassurance that the sound wasokay, we turned the set on with thevolume control kept down and justobserved the screen. There was noraster present. After substituting allhorizontal and high -voltage tubeswith no luck, we decided to pull thechassis.

After setting up in the shop, wechecked the boosted B -plus andfound it to be only 250 volts. Thisseemed like a clear-cut high -voltageproblem until we measured the reg-ular B -plus and found it to be only135 volts-so the boost circuit wasworking. Since the B -plus readingright up to the cathode of the 5U4low -voltage rectifier was still only135 volts, we replaced the 5U4. Thisbrought the straight line back to thescreen instead of the raster. Replac-ing the vertical oscillator tube nowbrought back the full raster and nor-mal picture.

The sound was turned up and ap-peared normal. However, when theold 5U4 was temporarily put back,there was a definite decrease insound output, which the customereither hadn't noticed or had failedto admit. In any case, here is an in-stance where, because of confusingcircumstances, a set was pulled tothe shop when the repair-two sim-ple tube replacements-could havebeen done in the home. The moral isthis: Although it may take somediplomacy, be careful about relyingor. the customer's complaint, nomatter how positive it is.-FrancisJ. Boyle, Winter Park, Florida.

Voltage from NowhereThe complaint on a 17K1 Motorola

was no horizontal sync. The oscilla-tor, which was running way off fre-quency, wouldn't respond to hori-zontal control action. However, re-moval of the control tube (a 6AL5phase detector) permitted the oscil-lator to run within its normal range.

A quick check of the afc circuit(Continued on page 72)


Tape Recorder Case Book

JAMES GRAFTON

Wow and FlutterThis problem child was a top-

quality instrument, a Concertone,with more than its share of mechani-cal woes. Wow was evident whenmusic was playing. When we playeda tape on which a steady 3 kc tonehad been recorded, a slow flutterbecame obvious as well.

At first it seemed the troublewould be fixed in a few seconds: thereel was warped, and kept rubbingagainst the tape. However, replacingthe bent reel and repositioning it tosit lower on the spindle to preventtape rub (not many recorders pre-sent this convenience of a reel -mounting level adjustment), hadpractically no effect on reducingwow and flutter.

The fact that direct motor driveis used on this model instead of beltdrive eliminated the possibility ofworn or oily belts as the usualtrouble source. With the power offand the reel removed, the machinewas engaged in the running positionand the take-up motor was turnedby rotating the spindle by hand.There it was! Ever so slightly, thespindle stuck momentarily as it spun.The motor or shaft was binding.

Since replacing the whole motorwould be expensive, we took agambler's chance. To remove thebind, the shaft was tapped quitevigorously with the wooden handleof a screwdriver. This removed thebind permanently. A quick visualinspection of the brake assemblyshowed the pad was not draggingdue to incomplete brake disengage-

Service Problems: Electrical & Mechanical

ment; all else boas well here.When the 3 kc tape was now

played, we were pleased to note theabsence of wow. However, it wasnow easier to hear the flutter-apeculiar "multiple" kind of flutter, atthat. Pressing a fingernail against thecapstan while the drive motor wasturning was convincing, for the time,that the drive shaft was not eccentricor loose. The only thing left was toreplace the rubber pressure roller,although it looked clean and 'smooth.

That did it; wow and fluttet wereboth undetectable to the ear. Afterthe machine was returned, the ownershowed us how he always left themachine engaged with the poweroff so he could turn it on immedi-ately with a flip of the switch: Henever realized that the capstanpressing against the roller in onespot for weeks at a time madetiny permanent deformations. Youcouldn't see the dents, but you couldhear them.

Magnetized HeadsA frequent customer complaint

when a tape recorder is brought infor service is a high level of back-ground noise (tape "hiss") on alltypes of program material duringplayback, the level being muchhigher than was originally presentwith that recorder. The first thingto do, of course, is to confirm thecustomer's claim that the level hasactually gone up-sometimes it hasalways been high, but the owner isjust getting around to letting itbother him. This is done by playingback one of his older tapes, one thatwas recorded before the hiss levelrose. The check can also be accom-plished by playing a tape recordedon another machine to compare itshiss level on playback through thedefective instrument against the hisslevel on a tape just recorded on themachine under test.

If the machine is actually record-ing an abnormal amount of hiss onfresh tapes-a certain amount is in-evitable, especially with low levelrecordings-suspicion must first fallon the first stage of the recordingamplifier. This tube is generally op-erating at high gain with a low-level input. If the tube itself is noisyat all, the noise will be quite evidentand get itself recorded on to the tape.

If changing the tube doesn't yieldmuch improvement, the probabilityis that the recording head (often thecombined record -playback head) hasbecome magnetized. Periodic demag-netization is a necessary procedurewith many recorders anyhow.

A demagnetizing coil, which iseasily made up, should always be onhand wherever tape recorders arerepaired. Any choke that will with-stand ac line voltage-a power -sup-ply filter choke is adequate-can beadapted for this use merely by hav-ing the leads from an ac line cordconnected to its terminals, so that itcan be plugged into a handy walloutlet.

To demagnetize a head, plug thecoil into the ac source and place thecoil up against the head in question.The coil is then slowly and steadilydrawn away from the head. In es-sence, this is similar to the mannerin which tape is erased (or demag-netized), as the tape is slowly trans-

away from the field of theerase head. After the demagnetizingcoil is several feet away from thehead-the greater the distance, thebetter-the coil is unplugged fromthe ac source.

Distorted RecordingProblem: tapes recently recorded

on the instrument are highly dis-toried when played back. Instead ofbeing reproduced smoothly, sound

from the tape appears to issue fromthe speaker in jagged bursts or bur-bles. Tapes recorded earlier on thesame machine are clean, eliminatingthe instrument's playback system asthe trouble source.

What has probably occurred isthat the bias oscillator, used only inthe record position, is inoperative ordefective; and, more likely than not,simple replacement of the oscillatortube will clear up the difficulty.When this symptom occurs, the re-corder will generally not erase ef-ficiently, or at all, since the ac biasoscillator probably also supplies thecurrent for the erase head.


To Cure Blocked Reception

Use a "Phantom" AntennaReradiator Relays Signal into Dead Spot without Wires

JAMES A. MCROBERTS

A typical reception problem inmany localities, both urban andrural, is shown in Fig. 1. Someblocking structure, or more than one,prevents direct interception of thetelevision signal. It may be a moun-tain, as illustrated in the figure, or itmay be a tall building, as would bemore usual in the urban situation.

When the set's antenna is oriented,in such cases, to pick up the bestpossible signal, this signal may be awave that has been reflected severaltimes and not capable of producinga very good picture. To overcomethe difficulty, the set's antenna issometimes placed on top of the ob-structing hill or tall building, wherea good signal may be obtained, andfed down to the receiver locationvia a transmission line, with or with-out booster amplifiers.

"PHANTOM.

FROM STATION(S)--

SETANTENNA

Fig. 1-"Dead spot" in a valley or betweentall buildings, fed by phantom pickup unit.

Fig. 2-Alternate position of phantom unit

In many such oases, a "phantom"antenna can solve the problem with-out the use of long, runs of transmis-sion line and boosters. The phantomis itself mounted in the clear withrespect to signal so that it picks upsignal efficiently and retransmits orreradiates to the set's normal pickupantenna. The phantom may bemounted on a hill (Fig. 1) or atopa Wilding (Fig. 2). It may befarther from the signal source (Fig.1) or nearer to it (Fig. 2) than thereceiver's antenna. In many caseswhere long runs of line, such asfrom oae building to another inmetropolitan areas, are impractical,use a phantom can save the day.

- ,

Orientation of Antennas

The phantom is oriented with thedirection of reception, without re-gard to the location of the receiverantenna. To do its job it must pickup a reasonably strong signal. Forthis reason, a signal intensity checkshould be made before the phantomis erected. The check should coverall times of the day (and night) ofinterest to the set owner.

As for the set's normal antenna,it is connected in the conventionalway, through a transmission line. Itsorientation, however, is unconven-tional. It is beamed directly towardthe phantom. This usually means itwill not be mounted in a horizontalplane but will, in most cases, beangled up toward the higherphantom.

The receiver pickup antenna maybe of conventional high -gain design,using whatever directors and/or re-flectors are present in such a unit.However the phantom, as a generalrule, does not have a reflector. Ifthe installation is similar to the oneshown in Fig. 2, for example, use ofa reflector in the phantom wouldsuppress retransmission in the direc-tion of the set's pickup antenna, de-feating the purpose of the installa-tion. If the phantom is mountedbehind the set's pickup antenna, asin Fig. 1, the reflector may be usedto increase signal strength.

For efficient operation, the phan-tom antenna must be terminated ina resistor equal to its characteristicimpedance, as shown in Fig. 3. This

CLOSE WITH RESISTOR(30011 OR THE

CHARACTERISTIC IMPEDANCE)

2nd FOLDEDDIPOLE

Fig. 3-Phantoms (one or more may be on asingle mast) are terminated with resistors.

is necessary to make the antennaact like a tuned circuit and become,in effect, a retransmitter. Withfolded dipoles and many other con-ventional types, this value will be300 ohms. To retransmit efficiently,the impedance of the phantom doesnot have to be the same as that ofthe final pickup antenna or of thereceiver's input impedance.

Also as shown in Fig. 3, more thanone folded dipole may be used inthe phantom to increase signalpickup or to receive more than onechannel. When two or more are used,the spacing between any two ad-jacent dipoles should be at leasttwice the length of the individualdipoles. This is to prevent undue in-teraction, which results in a lower-ing of the characteristic impedanceof the dipoles. The dipoles may beplaced closer together than this dis-tance under one condition: the low-ered impedance must be known sothat suitable resistors, less than 300ohms in value, may be used to closethe dipoles

The two dipoles shown in Fig. 3might also represent a high- and alow -frequency dipole mounted onthe same mast, as is used in metro-politan areas to receive several dif-ferent channels. Different dipoles



at CIRCUITS

No. 7: Two Slopes for One-FM to AM Conversion, Concluded.

Fig. 1-How detuned receiver responds to FM.

SIDNEY C. SILVER

MANAGING &nos, TECHNICIAN

The last discussion described amanner in which a frequency -mod-ulated carrier could be convertedinto a carrier with correspondingamplitude modulations. This system,called slope detection or conversion,is convenient in that it makes it pos-sible to use a simple AM detector, anordinary diode, to achieve final re-covery of the audio signal while dis-carding the r -f or i-f carrier. Asnoted, however, this method is notconventionally used today in theform that was shown.

One of the reasons for avoidingthe straightforward slope method isits relative inefficiency. Referringonce more to the detuned i-f re-sponse curve that is used in thismethod, shown here as Fig. 1, let usre-examine what occurs when thecarrier is swung to either side ofthe center or rest frequency, F.. Wehave already seen what happenswhen the carrier swings out as faras point A or B: carrier amplitudecoming out of such a tuned circuitis varied to correspond with theoriginal, deviations in frequency.

However, let us assume that a veryloud modulation passage swings thecarrier out to point C, which repre-sents just as much a frequencychange from point B on the base-line (frequency) as point B doesfrom point F.. On the vertical axis,representing voltage output, we haveseen that output varies 0.1 volt fromfrequency Fo (1 volt) to frequencyB (0.9 volt). When frequency

changes to C, there should be a cor-responding change in output of an-other 0.1 volt, to 0.8 volt. Actually,the change is less than this, as thediagram shows. In other words, be-yond certain narrow limits, we can-not expect voltage output variationsto correspond faithfully to frequencychanges.

The reason for this lack of corre-spondence is that the slope or skirt ofthe i-f response curve is not linearover its entire length. Only the por-tion from A to B is close to being astraight line; only over this portion,therefore, can we expect a linearconversion of signal from one condi-tion of modulation to the other.: Theusable linear segment, A -B, repre-sents only a small portion of thetotal slope; the rest is wasted. Inactual practice, the usable linearportion rarely exceeds 20 percent ofthe total length of the slope. Thuswe have a highly inefficient conver-sion device that will fail us as soonas we require it to handle any ap-preciable signal amplitude.

Push -Pull SlopesTo overcome this hurdle, the ar-

rangement shown in part A of Fig. 2was introduced. The final i-f stageis followed by a somewhat uncon-ventional transformer with a ratherconventional tuned primary (L1),but with two tuned secondaries, L2and L3. Disposition of the seconda-ries suggests a push-pull arrange-ment. In effect, that is what wehave: signal in one of the second-

aries is positive with respect to sig-nal in the other.

Neither of the secondaries is tunedto the center carrier frequency, aswas already noted with the single -slope method. Let us assume thatL2 has been tuned to some frequencybelow the nominal value of the car-rier. L3 is then tuned just as faraway from the center frequency, butit is resonated to a frequency aboveit. Since our push-pull secondarieshave opposite polarities, the curveshowing the response of one is rep-resented as going in the oppositedirection from the response curve ofthe other. These curves showing re-sponse of L2 and L3 are depicted inpart B of Fig. 2.

2 Slopes Equal 1 S -CurveWhen we combine these two

curves, to get a picture of responsein the combined secondary system,we get the curve of part C-the fa-miliar S curve. Note what portionof this combined output is linear.The straight-line segment, suitable,for faithfully converting FM to AM,is more than four times as great as itwas when we used a single slope. Itis now possible to handle appreciablesignal amplitudes.

This is not, of course, the wholestory. In modern detectors that startout with the same basic operation, asingle tuned secondary is now used,with an additional connection be-tween the secondary and the pri-mary. Changes in amplitude result


Fig. 2-The addition of two response curves in push-pull yields the familiar FM S-curve.

1-F STAGE

CI

L200

NC2 cr0

00-1,ti

C 3

So 0

12,

L3


Cure for Noisy SpeakersWhen rattling or distorted output

is the result of a defective speakercone, I have found that coating thedefective cone with ordinary shellacwill instantly stop the noise in mostcases. Apply shellac to the cone withthe radio playing. By the time theapplication is completed, the noiseshould be all gone. Make sure to getthe shellac on heavy around the edgeof the cone.

The writer has repaired manyspeaker cones in this way, severalof which have been in use for sixmonths or more. They are still work-ing as good as new, with no appar-ent need to replace the cones.-W. C.Beasley, Arcanum, Ohio.

Salt Water Test BatteryThe photograph shows the two

leads from a meter immersed in asalt water solution. The meter is seton its 60-microamp scale. The cur-rent reading on the meter is about20 microamp. This small home-madesalt -water battery is excellent fortesting meters, such as milliammetersand microammeters, as there ispractically no possibility of damageto the meter movement due to thelow output from this type of rudi-mentary battery.

The movement of nearly any de-vice that uses a meter can bechecked with this salt -water tester.The meter movement of a photoelec-tric exposure meter, for example,can also be tested in this way. It isa good idea to use a silver coin anda length of copper wire as the two

Salt water battery tests meter movements.

S

to speed Servicing

electrodes in this solution, connect-ing each of these to one of the leadsfrom the dneter for the test.-L. A.Williams, Brooklyn, N. Y.

Easily made shorting bar for lumping fuses.

Handy H -V JumperWhen checking the horizontal out-

put and high voltage circuits in aTV set where the fuse has blown,the tool illustrated here makes ahandy jumper device for momentaryshorting of the fuse -holder termin-als. While prolonged jumping of thefuse terminals may cause damage ina defective circuit, it is often advan-tageous to short out the fuse temp-orarily to make observations. Forexample, arcing may thus becomeevident in one of the tubes or else-

where in the circuit, which will aidin localizing the defect. With theprods of this tool shorting the fuseholder, the tool can be pulled awayquickly at the first sign of trouble.

The shorting bar can be made upeasily. The one shown was madefrom a Type 7300 Weller soldering -gun tip, used for older model Wellerguns. Other similar types will serveas well. The tip is forced into theshaft of a hollow alignment tool, asillustrated, or into a hollow dowelstick. A tool of any length may beused, but about 6 to 8 in. is enoughto reach almost any fuse locationconveniently. The open ends of thesoldering tip may then be spaced tofit across any fuse holder.-HowardLambert, Sioux Falls, So. Dakota.

Phono Cartridge CheckWhen it becomes necessary to

check the output of a phonographpickup cartridge to see whether itis working, a quick and simple testcan be made with a pair of head-phones or a single headset. Theheadset need simply be connectedacross the output terminals of thecartridge, or more conveniently,across the leads from the outputterminals, so that the connectionswill not interfere with placing thepickup on the record. When thecartridge is then placed on the rotat-ing record, one need simply listento the output through the headset.Nearly all standard cartridges (crys-tal and ceramic types) provideenough output to cause the ear-phones to operate satisfactorily. Theonly exceptions are the magneticand other low-level high-fidelitytypes of pickups, but even these canbe checked through a suitable pre-amplifier known to be operatingproperly.

In addition to being quick andeasy, the headphone method ofchecking can be used in the field aswell as on the bench. It is onlynecessary to keep a single headset,which occupies a small amount ofspace, in the tool box.-El/isivorthBell, Anniston, Ala.


New Products for TechniciansB -T TV DISTRIBUTION AMP

Low -noise Model DA8-B distributionamplifier provides eight isolated TVoutlets with over 10 db all -channel gainfor master TV systems. The DA8-Bfeatures all -triode circuitry and willhandle either 300 ohm twin lead or 75ohm coax. Included are groundingclamps, lugs and terminating resistors.More than 8 TV outlets can be providedby connecting a line splitter. TheDA8-B does not require any tuning.Blonder -Tongue Labs., 526-536 NorthAve., Westfield, N. J.-TECHNICIAN(Ask for No. 3-4)

Futuramic PROBESHigh -ohms probe extends ohmmeter

range of VOM by a factor of 10. It con-verts the Rx10,000 ohms range to anRx100,000 ohms range and permitsmeasurement of resistance values up to200 megohms. Probe can be used withany 20,000 ohms -per -volt VOM havinga center -scale indication of 12 ohms,and an internal ohmmeter battery of7.5 volts. Model 261 probe is put intooperation in place of conventional testlead. Futuramic Co., 2500 W. 23 St.,Chicago, 111.-TECHNICIAN (Ask forNo. 3-5)

Quam WOOFERSTwo new low frequency woofers in-

clude the 12A1OL (shown in photo)with frequency response 40-4000 cps,±5 db. Resonance point is 60 cycles andvoice coil impedance is 6-8 ohms.Power handling capacity, 10 watts.Baffle opening 111A6 in.; depth 57/8 in.The 15A1OL has a frequency responseof 30-5000 cps, ±5 db. Resonance pointis 45 cycles; impedance 8 ohms; power10 watts. Baffle opening 137/8 in., depth71/2 in. Quam-Nichols Co., 236 E. Mar-quette Rd., Chicago 37, Ill.-TECH-NICIAN (Ask for No. 3-1)

Hickok TUBE TESTERModel 539B dynamic mutual con-

ductance tester provides 6 micromhoranges, 60,000 to 600, and a rectifierdiode range and a VR range. Choice of4 ac signals (0.25, 0.5, 1 or 2.5 volts)plus dc bias may be applied to the grid.AC meter measures line voltage. Newshort test measures resistance in ohms(to 50 meg), in addition to neon lampfor quick "good -bad" checks. Testsselenium rectifiers and germaniumdiodes. Hickok Electrical InstrumentCo., 10523 Dupont Ave., Cleveland 8,Ohio-TECHNICIAN (Ask for No. 3-2)

MORE INFORMATION WILL Bk SENTTO YOU

on new products described here. Simplyitem of interest on postage -free inquirywrite in number given at end of eachcard, poge 33.

Weller SOLDERING AIDThis soldering aid is a pencil -shaped

plastic holder fitted at one end with atapered metal point and at the otherwith a notched blunt metal end. It canbe used to twist wires into tight con-nections prior to soldering, to untwistwires, to hold work being brought tosoldering heat, and to hold springs andother parts clear of points being heated.Retail list is 500. Weller Electric Corp.,808 Packer St., Easton, Pa.-TECH-NICIAN (Ask for No. 3-6)

Workman CRT REPAIRERThe "Bosipt" is a simple devicewhich

Burns Off Shorts In Picture Tubes,doing the job in two minutes. Just plugit into the 5U4 receiver socket, connectthe other end to the pix tube base, andpress two buttons. One button is forburning off cathode -to -filament shorts,the other for cathode -to -grid shorts.Dealer net is $3.67. Workman TV, Inc.,Teaneck, N. J.-TECHNICIAN (Askfor No. 3-7)

EV 100 -WATT AMPLIFIERModel A100 professional, rack -

mounted 100 watt high-fidelity ampli-fier for musicasting and industrialpublic address employs the new Wig-gins Circlotron circuit. Specs include:Frequency response: ±0.5 db 20-50,000cps, Harmonic distortion: Less than0.5% at rated output. Intermodulationdistortion: Less than 1.2% at rated out-put Hum and noise: 85 db below ratedoutput. Damping factor: Adjustablebetween 0.1 and 10. Electro-Voice, Inc.,Buchanan, Mich.-TECHNICIAN (Askfor No. 3-8)

TVS CRT REACTIVATORThe Dyna-Beamer is said to restore

up to 75% 'pf repairable picture tubeswithout removal from set. Restoresemission, clears grid -to -cathode shorts,indicates whether "no raster" or "dimraster" is due to bad picture tube, orimproper grid bias in set (leaky cou-pling condensers, etc.) Only one switchto operate. 10 -day rhoney-back guar-antee. Tampa Video Service, Inc., Dept.DM, 6105 Interbay Blvd., Tampa 9, Fla-TECHNICIAN (Ask for No. 3-3)


Latest Test Instruments

GE TRANSISTOR CHECKERA new portable transistor tester,

about the size of a pocket radio, maybe used to check all junction transistorsfor short circuits, opens, leakage, andcurrent gain. Separate plug-in socketsaccommodate NPN and PNP types.Also included in the package are 5universal type transistors, commonlyused in transistorized radios and othercircuits, and a transistor interchange-ability chart. Suggested price is $39.95.General Electric Co., Electronics Park,Syracuse, N. Y.-TECHNICIAN (Askfor No. 3-17)

ASD TUBE CHECKERThe 400A automatic tester completely

eliminates selector switches, knobs,load controls, and filament switches.Contacts for setup are made throughthe holes in a player -piano -type rollchart. The technician simply selectshis tube number on the rollchart, andplugs the tube into the socket indicated.Electrical contacts automatically selectproper settings. The tester uses acathode -conductance test. AmericanScientific Development Co., 334-336 S.Main St., Ft. Atkinson, Wis.-TECHNI-CIAN (Ask for No. 3-18)

Seco TRACER-LOCALIZERA device for "sounding off" an audio

tone in the case of a break in the signalpath, the Monitron monitors signalpaths without requiring constant atten-tion. An "eye" tube monitor signalslevel independently of alarm circuits,and lamp lights in channel in whichfailure occurs. The Monitron can tracesignals and localize intermittent prob-lems on any steady signal carryingcircuit. SL10 Monitron lists at $11940.Seco Manufacturing Co., 5015 PennAve. South, Minneapolis, Minn.-TECHNICIAN (Ask for No. 3-20)

Triplett LINE CHECK rModel 3000 enables the user to con-

nect an electrical load equal to theappliance to be installed on the line.Easy to operate, it checks a line inonly three steps: (1) plug wall cordinto outlet to be checked; (2) Set loadswitch No. 1 to the load position (500,1000 or 1500 watts) (3) Press and holdbutton No. 2 long enough for the meterpointer to give a steady reading. Netprice for the unit is $34.50. TriplettElectrical Instrument Company, Bluff-ton, Ohio-TECHNICIAN (Ask for No.3-19)

MORE INFORMATION WILL BE SENTTO YOU

on new products described here. Simplywrite le number given at end of eachitem of interest on postage -free inquirycard, page 33.

RCA JR. VOLTOHMYSTModel WV -77B embodies new fea-

tures in addition to those of earlier ver-sions. Measures from 0.05 to 1200 voltsdc in 5 ranges, even in presence of ac;from 01 to 1200 volts ac (rms) in 5ranges. Resistance from 0.2 ohm to 1billion ohms in 5 ranges. A single -unitswitch -probe and cable permits instantselection of de or ac/ohms operation,and is completely shielded and in-sulated. Radio Corp. of America, 30Rockefeller Plaza, New York 20, N. Y.-TECHNICIAN (Ask for No. 3-21)

E -O -V TUBE REACTIVATORA new principle of reactivation will

renew both TV picture tubes and re-ceiving type radio and TV tubes. Wherefailure is due to loss of emission by thecathodes, life can be extended farbeyond normal time of discarding. Inthe Electron -O -Vac, reactivation is acontrolled process. The instrument in-corporates circuitry for checking pic-ture tubes. Electron -O -Vac Corp., 4620Leary Way, Seattle 7, Wash.-TECH-NICIAN (Ask for No. 3-22)

RCP TUBE -TRANS. TESTERCombination tube and transistor

tester combines versatility and low costrequired for radio and TV servicing.Model 325 tests NPN and PNP trans-istors as well as all radio and TV tubes-including b -&-w and color picturetubes, and all series -string heatertypes. Tests for dynamic mutual con-ductance, emission and shorts. Currentamplification of transistors is accuratelymeasured. Price is $129.50 net. RadioCity Products Co., 26 Rittenhouse Place,Ardmore, Pa.-TECHNICIAN (Ask forNo. 3-23)

Sena:: LEAKAGE CHECKERDesigned to check grid to cathode,

cathod a to heater and capacitor leakage,model LC2 also detects grid emissionand gas in 70 popular tubes used incritical circuits in radio and TV. Leak-age of 100 megohms or below registersbad except in electrolytics, where 50,000ohms or under reads bad. In kit format $19.95 net and $24.95 net assembled.Service Instruments Co., 171 OfficialRd., Addison, M.-TECHNICIAN (Askfor No. 3-24)

TECHNICIAN March, 1956 47.

New Antennas & Accessories

C -B CLICK -RIG CONICAL -40.Snap -open conical antenna, model

C64, is designed so that all elementsfold open and lock into position withouttools. Assembly time of 11 seconds isreported. Insulator includes air -plasticspacing to prevent signal loss. Otherfeatures are a device for locking trans-mission line to insulator to eliminatestrain on terminals, and end caps onelements to prevent wind howl. Sixcombinations are available in this lineof conicals. Clear Beam Antenna Corp.,Canoga Park, Calif.-TECHNICIAN(Ask for No. 3-25)

Snyder INDOOR ANTENNA ->.The Tenna Tuner Model 7D, can be

attached quickly and safely to theantenna leads on the receiver. By push-ing buttons and manipulating side ele-ments, each station can be tuned inwith maximum results. The develop-ment is attractive and designed for useon the set itself. It helps eliminateghosts and interference, has no motorsor moving parts. It is being sold at$9.95 list price. Snyder ManufacturingCompany, 22nd & Ontario Sts., Phila-delphia 40, Pa.-TECHNICIAN (Askfor No. 3-26)

Taco STAY-LOK ANTENNASTaco Trappers and Super Trappers

are now available in two designs. Orig-inal models employing tension -boosterdesign are supplemented by models2880, 2885 and 2890, which utlize thenew Stay-Lok design whereby ele-ments automatically lock without tools.Construction provides rigidity andalignment of elements. Antenna may becollapsed by lifting of the lockingtab Redesigned phasing lines pro-vide additional gain. Technical Appli-ance Corp., Sherburne, N. Y.-TECH-NICIAN (Ask for No. 3-27)

Channel Master TRANS -LINE -40.Transmission line with 20 wire

strands per conductor, very soft andflexible, is offered in two series: TwinTwenty, and Challenger. Twin Twentytransmission line is made with pure,low -loss virgin polyethylene for longlife. It is marked every 10 feet. Chal-lenger line, aimed at the low -pricemarket, incorporates quality featuresincluding 20 -strand conductor and purepolyethylene. Twin 20 in silver oror brown; Challenger in brown. Chan-nel Master Corp., Ellenville, N. Y.-TECHNCIAN (Ask for No. 3-28)


on new products described here. Simplywrite in number given at end of eachitem of interest on postage -free inquirycard, page 33.

Finco ANTENNASModel B-6 Geomatic incorporates 4

coaxial capacitors in one folded dipole,causing the dipole to operate as onelength on low -band, and a differentlength on high -band. The twin drivenantenna produces high gain on bothbands with high front -to -back ratio.It is preassembled with self-locking,self -aligning brackets. Model B-7 alsoincludes two 3 -element colinear direc-tors on high -band and inductance -tuned low -band director. Finney Co.,4612 St. Clair Ave., Cleveland, Ohio-TECHNICIAN (Ask for No. 3-29)

Dynamic ACCESSORIESAccessories for FM, UHF, VHF and

color TV include Model T115 Attenu-ator: Removes overload in strong sig-nal areas. Model T121 interference sup-pression Hi -pass TV -FM filter: elimi-nates antenna distubances caused by

cence, neon, appliances, industrial RFand S.W. transmitters, passes all fre-quencies above 40 mc. Model T130 deluxe tri-set coupler. For operation ofany combination of 2 or 3 TV sets or

receivers from 1 antenna. Less thanC db insertion loss, 40-50 db rejectionratio. Dynamic Electronics -New York,Inc., 73-39 Woodhaven Blvd., Forestlips, L. I., N. Y.-TECHNICIAN (Askfor No. 3-301

JFD OUTDOOR COUPLERDesigned for outdoor use, these cou-

plers can be mounted on the mast topermit the running of the lead-ins out-sidi, the house to the rooms desired.Coi-plant encapsulation seals the com-ponents rendering them impervious toclimatic effects. Insertion loss is low.Increased isolation between sets. No.AC40 for 2 sets, AC60 for 3 sets, andAC70 for 4 sets, to 300 ohm antennas.JFD Mfg. Co. Inc., 6101 -16th Ave.,Brooklyn 4, N. Y.-TECHNICIAN(Ask for No. 3-31)

Medal ANTENNA KITSComplete line of Antenna Kits is de-

signed for the TV dealer. Carrying theCaptain trade mark, they are packagedin cartons that double as point -of -pur-chase displays when opened. Kits in-corporate all -aluminum antenna, plusmast, lead-in wire, mounts, guy wire,arrestor, and standoffs for a completeinstallation. Complete line for UHF andVHF. Medal Mfg. Co., 194 Silver St.,Sharon, Pa.-TECHNICIAN (Ask forNo. 3-32)

4$TECHNICIAN March, 1956

3

NO .57

PYRAMIDtechnicalbulletin

THERE IS MORE TO A CAPACITOR

THAN ITS DESIGN FORMULA:

K D= A

Pyramid's production and life tests of their capacitors are arrongthe most stringent in the industry. Production test for voltagebreakdown, capacitance, power factor, insulation resistance andseal are performed on 100% basis. In consisting of life, tem-perature and immersion cycling, vibration, and corrosion whereapplicable. These serve to guarantee that the capacitors youpurchase are consistently as represented to be.

Pyramid capacitors also owe their exceptional perform.ances to the type of materials used in their manufactureand the production methods which Pyramid engineershave devised. For example, in the new Pyramid IMPcapacitor, a new, exclusive plastic molding techniquewas developed which bonds casing, impregnated ele-ment, and tinned copperweld leads into one compactassembly capable of withstanding severe physical abuse.In addition, this unit is heat and moisture resistant with-standing the RETMA humidity -resistance test to a re-markable degree. In another capacitor, type MT metal-lized paper units, vacuum impregnation is employed andthe ends of the capacitor are sealed with plastic. Then,as a final step, the entire unit is completely coated with ahighly moisture resistant wax. It is production techniquessuch as these which, in conjunction with high qualitypapers, impregnants (such as Halowax, Mineral Oil, orSilicone Base Synthetic Oil), and metals, that accountfor the excellent stability and long life that Pyramidcapacitors exhibit.

Pyramid capacitors, particularly electrolytic capacitors,are specifically designed for long shelf life. To achievethis goal requires that the various materials and chemi-cals used in the manufacture of these units possess ahigl quality and long term stability. Another contributingfactor to long shelf life is the care which is taken to pro-vide maximum protection against the corrosive effectsof cnemicals in the atmosphere. This necessitates a con-tainer which is well insulated against the intrusion ofmoisture, i.e., one which is air tight and hermeticallysealed.

The number of different types of capacitors that Pyramidmanufactures is extensive. Included in this line are thefollowing:

1. Electrolytic capacitors, type TD, with each unit sealedin a metal tubular case. Available in single sections, dualsections, and triple sections.

2. Electrolytic capacitors in screw base metal con-tainers, type MC. Available in single and dual sections.

3. Twist -Mount electrolytic capacitors, type TM. Avail-able in single, dual, anc triple sections. Different sectionsmay have different working voltages.

4. HI -TEMP Twist -Mount Electrolytic capacitors, typeTWH. Designed for 100°C operation.

5. Dry Electrolytic capacitors in wax -filled, impregnatedcardboard tubes, type CDB. Available in single, dual, andtriple sections. Sections may possess individual leads orshare a common negative terminal.

6. Plug-in Electrolytic capacitors, type DO, providedwith 4 pins on standard octal base.

7. High -capacitance, 'ow voltage electrolytic capacitors,type PFB.

8. Molded tubular paper capacitors, type IMP.9. Miniature tubular paper capacitors. Type 85LPT.10. Ceramic -cased tubular paper capacitors, type CT.11. Bathtub -Type Oil -Paper Capacitors, types PDM,

PDMT, PDMB.12. Metal -tubular 01 -Paper capacitors, types PTIM,

PTDMV, 4PTIM, 4PTIMV, 7PTIM.13. Small -base oil-paoer capacitors, types PKM, PKMF,

PKMS, PKMT, and PI<MB.14. High -voltage oil -paper capacitors, types PLM.

PLMF, PLMS, PLMU, PLMR.15. Kraft -tube metallized paper capacitors, type MT.16. Metal -can metallized paper capacitors, types

MPGK, MPGM.17. Metal -tube metallized paper capacitors, types

MPTIK, MPTIM.18. "Glasseal" subminiature paper tubular capacitors,

and many others.

Pyramid capacitors are competitive in price because of themodern production methods that are empolyed throughoutevery phase of capacitcr procuction. Whenever possible, auto-mation techniques are being applied so that more uniform highquality may be achieved. Much of Pyramid's success is due alsoto the aggressiveness of Pyramid engineers in pioneering newproducts.

FOR COMPLETE DATA SEND FOR ENGINEERING BULLETIN -FORM IMP-2

PYRAMID ELECTRIC CO. North Bergen, New Jersey SEE US AT BOOTH 586AT THE I.R.S. SHOW

PYRAMID IS THE BIG NAME IN CAPACITORS AND SELENIUM RECTIFIERS TODAY/

New Tubes & Components

Raytheon TRANSISTORS .4110.

PNP silicon transistors CK790, CK791and CK792 are available for commercialapplications. These three new silicontypes are designed for high frequencyoperation at high ambient tempera-tures, thereby opening up new tran-sistor applications. These transistors willbe suited for low frequency amplifiers,switching circuits and as replacementsfor relays in equipment which mustoperate at high ambient temperatures.Raytheon Manufacturing Company,Newton 58, Mass.-TECHNICIAN (Askfor No. 3-12)

RCA 8DP4The 8DP4 is a compact, directly

viewed, rectangular, glass picture tubeof the low -voltage electrostatic -focusand magnetic -deflection type. Intendedfor low-cost, compact applications, ithas a spherical filterglass faceplate, ascreen TY16" x 53/8" with slightly curvedsides and rounded corners and a mini-mum projected screen area of 35.5sq. in. Employing 90' deflection, it hasmaximum overall length of only 103/4"and weighs less than 3 lbs. Tube Div.,Radio Corp. of America, Harrison, N. J.-TECHNICIAN (Ask for No. 3-11)

Sylvania TWIN -TRIODE

The 12AD7 double triode, a 9 -pinminiature, fills the need for a low -humpreamplifier in audio applications. Ex-tremely low hum level-less than 3.0my rms on the plate of each triodewhen operated in a typical resistance -coupled amplifier has been achieved byfeatures that include a reverse -coilheater to help cancel magnetic cou-pling. The 12AD7 will at all times meeta minimum hum capability. SylvaniaElectric Products Inc., 1740 Broadway,New York 19, N. Y.-TECHNICIAN(Ask for No. 3-10)

Int'l. SELENIUMS "1>Selenium TV rectifier series uses a

new concept in surface contact whileretaining "center support" construction.This construction, "AirKore," featuresan open -spaced six -contact springwhich provides greater contact areaand a uniform temperature rise acrossthe surface of the rectifier plate topermit optimum circulation of air.AirKore is available in all standardsizes and is supplied in both stud andeyelet types. International RectifierCorp., El Segundo, Calif.-TECHNI-CIAN (Ask for No. 3-9)


on new products described here. Simplywrite in number given at end of eachitem of interest on postage -free inquirycard, page 33.

Clarostat W -W CONTROLFor use in printed -wiring assemblies,

a 2 -watt wire -wound control is avail-able with terminals that facilitatemounting and connections. A variationof Series 43, the printed -circuit controlmeasures 111/8" in diameter by 3/143"

deep, and is available with or withouttap. Resistance values are from 1 ohmto 50,000. Clarostat Mfg. Co., Dover,N. H.-TECHNICIAN (Ask for No.3-13)

R -R MIN. SELENIUMSMiniature selenium rectifiers with

special snap -in terminals designed forprinted wiring boards will snap into theboard with sufficient mechanical rigid-ity to hold firmly in place. Currentlyavailable are half -wave stack types8Y1B and 8J1B, rated at 30 ma. and 65ma., respectively, at off the line volt-ages, with a capacitive load in ambienttemperature of 45 C. Radio ReceptorCo., Inc., 251 W. 19th St., New York 11,N. Y.-TECHNICIAN (Ask for No.tz14 )

Triad FLYBACKSFourteen new correct replacement

flybacks are designed for use in Ad-miral, Emerson, General Electric, Mo-tordla, Philco, Sentinel, Wells -Gardnerand Westinghouse television receivers,and are electrically and mechanicallyinterchangeable with the manufac-turer's original equipment. Completeline of TV transformers is listed inCatalog TV -155 periodic bulletins,copies of which may be obtained bywriting. Triad Transformer Corp., 4055Redwood Ave., Venice, Calif.-TECH-NICIAN (Ask for No. 3-15)

G -P SILICON TRANS.Precision durable silicon grown -

junction transistors will operate at peakefficiency under a wide range of op-erating conditions, including very hightemperatures. Characteristics includehigh input operating voltage, highercollector operating voltage, decreasedcollector series resistance. Available intwo categories, ono with emitter voltageof 2 volts and the other, with emittervoltage of 5 volts. Germanium ProductsCorp. (subsidiary of Bogue ElectricMfg. Co.), 52 Iowa Ave., Paterson 3,N. J.-TECHNICIAN (Ask for No.3-16)

soTECHNICIAN Mach, 1956

New Products

Knight CAPACITOR CHECKERCapacitor checker kit tests capacitors

while wired in circuit. It uses "magic -eye" to give indication of opens orshorts. Test for open can be made onany capacitor of 20 µµf or greater ca-pacity, even if in parallel with resistanceas low as 50 ohms. Test for shorts canbe made on any capacitor up to 2000af, even when shunted by 20 ohms.Price $11.65.-TECHNICIAN (Ask forNo. 3-33)

University SPEAKERThe 6303 is a high quality, triaxial

speaker where the tweeter unit is fittedwith a "reciprocating flares" hornthrough center of woofer and mid-range speaker assemblies. It handles 30watts over range of below 30 cycles tobeyond audibilty. Consumer net $80.10.University Loudspeakers, Inc., 80 S.Kensico Ave., White Plains, N. Y.-TECHNCIAN (Ask for No. 3-34)

Donner WAVE ANALYZERInstrument for testing performance

of music system amplifiers, Model 21, isused to measure distortion, amplitudeand frequency over 30 to 50,000 cpsrange. It enables the technician tomatch tubes and determine deteriora-tion of performance caused by aging ofcomponents. Donner Scientific Co.,2829 Seventh St., Berkeley, Calif.-TECHNICIAN (Ask for No. 3-35)

Phaostron VOMModel 555A VOM, with meter move-

ment protection up to 500 times over-load, features only 2 jacks for all meas-urements, separate range and functionswitches. The 55A measures: dc voltsfrom 1.5 to 1500 v. at 20,000 ohms/v.;ac volts from 1.5 to 1500 v. at 1,000oms/v.; de from 50 pa to 15 amps; acfrom 1.5 ma to 15 amps; db from -10 to+50; resistance from 0.25 ohm to 10megohms. Phaostron Instrument andElectronic Co., 151 Pasadena Ave., S.Pasadena, Calif.-TECHNICIAN ;, (Askfor No. 3-36)

Win-Tronix SWEEP CIRCUITANALYZER

Model 820 dynamic sweep circuitanalyzer supplies 60 cycle sawtooth, 15kc horizontal sawtooth and horizontaloutput transformer drive for trouble-shooting of both sync and sweep cir-cuits by signal substitution. Accessoryprobes produce sync pulses. Instru-ment provides a positive best of flybacktransformers and yokes, using neonindicator. Winston Electronics, Inc.,4312 Main St., Philadelphia 27, Pa.-TECHNICIAN (Ask for No. 3-37)


on new products described here. Simplywrite in number given at end of eachitem of interest en postage -free Inquirycard, page 33.

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Color TV

in Mass

Production Confident that the fall buying sea-son will see the long awaited rise ofmass sales in color -TV, RCA hasnow unveiled the fact that one pro-duction line in each of their twoplants, one in Bloomington and onein Indianapolis have fully convertedfor color receiver production. Theselines are geared to produce sets at aone -a -minute rate. Executive Vice -President Robert A. Seidel of RCAConsumer Products indicated thatRCA expects to sell 200,000 sets in1956 with the bulk of sales occurringafter June. Present sales are reportedas being approximately 1000 sets aweek. It was also reported that con-trary to the popular belief that cur-rent prices for color sets would en-able sales to the higher incomegroups only, the bulk of present salesareincome families, largely as install-ment purchases. There are no imme-diate price cuts in sight on currentmodels. After mid year, however,new designs are expected to offersome reduction in cost.

Plan tube production of over 30,000/month.

The conversion of the Blooming-ton plant to color production has in-volved an expense of more than$5,000,000. It has a total of fivg pro-duction lines and the remaining fourcan readily be converted from theirtwo -shift black and white operationwith demand for color. There arefour assembly lines in the Indian-apolis plant.


The chassis presently being manu-factured is a 26 tube design embody-ing some 2000 component parts. Thiscontrasts to approximately 1200 com-ponent parts in a black and whitereceiver. Not too great a cost reduc-tion can be made on the componentsbeing used in a color receiver sincemany of these items are the same asused in a black and white receiver,and thus are already priced by sup-pliers on a mass production basis. Inthe color receiver both the videoand sound i-f strips are on individualprinted circuits boards. On sets to beintroduced later in the year thenumber of printed circuits boardsare expected to go from two to sixthereby effecting some manufactur-ing savings.

Scene In RCA's Bloomington, Ind., plant ascolor TV goes on one -a -minute schedule.

Present receivers are supplied toprovide both VHF and UHF recep-tion. Actually two tuners are em-ployed, one for VHF and the otherfor UHF. The latter is "piggy-backed" or behind and mechanicallyganged to the VHF tuner. When inuse it feeds through the VHF tunerwhich meanwhile through switchinghas been converted into an addi-tional i-f amplifier. If receivers wereto be produced on a VHF or UHFonly basis additional cost reductionwould undoubtedly be possible here.Another expensive manufgisturingcost lies in the extensive test aud in-spection facilities required. AtBloomington nearly IA of the dinesare involved with inspection and testand % are on actual production.

Pix Tube Bottleneck

One of the big bottlenecks fre-quently mentioned by set makers hasbeen the availability bf color tubes.W. W. Watts, Executive Vice Presi-dent, indicated that approximately220,000 sq. feet of additional floorspace had been added at the Lan-caster plant and that employment incolor -TV tube production will beupped 50% during 1956. The pre-viously announced production ca -


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Circle numbers en free inquiry card, p. 33, for more product data. 53

YOU can'tBURNit out!

MODEL 456) Exclusive overload cut-out

system.

Protection of allpractical ranges.

Protects meter Gildentire internal cir-cuit against acciden-tal burn -outs.

Greatest engineering achieve-ment in VOM history

Zettede DewVOLT-OHM-MILLIAMMETER

The Model 456 is a new portable multimeter that incorporates the latest engi-neering advancements including the new technique that protects both meter andthe entire internal circuit against accidental burn -outs. In fact, any high voltage orcurrent may be applied directly across any function, including ohms, withoutdanger to the meter movement or associated components.This instrument has a sensitivity of 20,000 ohms per volt DC and 1,000 ohms pervolt AC. The 456 also includes DB ranges and provision for output measurements.

THE HICKOK ELECTRICAL INSTRUMENT CO.

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Ask for a demonstration of this most practicalVOM from your Radio -Electronic Parts Jobbertoday! ... Or write direct for technical details.

54 Circle numbers on free inquiry card, p. 33, for more product data.

Color TV Production

(Continued from page 53)pacity of 30,000 tubes per month bythe last quarter of 1956 will be sur-passed under present schedules. Ad-ditionally RCA is now buying colortubes from other manufacturers suchas Sylvania, Thomas Electronics andTung Sol.

"Trial in the home" is reported asbeing the most effective way inwhich to sell color sets. The lightingand provisions for exhibiting colorreceivers in a dealers store are detri-mental rather than helpful in con-firming a sale.

Color Upswing Assured

Other factors which were men-tioned as strengthening the outlookfor the upswing of color in the fallinclude: the recent reduction in thecost of service contracts to the con-sumer from $139.95 to $99.95. Thiscontract includes installation and un-limited service during a twelvemonth period. Increased program-ming and increased color -TV origi-nation facilities through the newNBC all color broadcasting station inChicago starting in April, new studiofacilities in the Ziegfeld Theater inN. Y., an additional color studio inBrooklyn and new control facilitiesin Burbank, Calif. R. A. R. Pinkham,Vice, President in Charge of Tele-vision Network Programs for NBCsaid that the present 40 hours amonth of high attraction program-ming could well double by Fall. NBCexpects to continue the 90 minutespectaculars. Next month they willpremier for the first time anywhereRichard III with Sir LaurenceOlivier. It should prove an interest-ing experiment because TV viewerswill see it first free. Movie goers willhave to pay box office to see it!


Selenium Powered

"Goofometer"The following information is re-

printed from the Sales Bulletin ofFederal Telephone & Radio Co.TECHNICIAN editors assume noresponsibility for patents, short cir-cuits or fist fights resulting from thepublication of this unique data.

The Components Division an-nounces the successful developmentof a new type of electronic measur-ing device, which will be marketedunder the trade name of Goofometer.The instrument is used in the detec-tion and evaluation of goofs, errors,fumbles, mistakes, boners, blunders,oversights, slips, flaws, and snafus.

The Goofometer contains a 1 milli-volt /I megampere Federal seleniumrectifier power supply; it operatessolely on reverse current.

Slightly overexposed photo of Goofometerbeing used in a typical application

Five independently adjustableranges are available, from milligoofsto kilogoofs, with an alternate scalecalibrated in irks per density squared'for the direct measurement of goof -age coefficients. Also provided are, areciprocal indicator for measuringgooficiency and a vernier attachmenthaving an accuracy of plus or minusone microgoof for precision fault-finding.

A high input impedance oseillo-scope for visual off -beam indicationmay be used in conjunction with anencephalographic display for detect-ing transients, squares, and other re-pulsives.

ATTACHMENTS:I. High -sensitivity Goof probe with

excellent inverse response charac-teristics. To install, theiGoofprobe issimply hammered into the cerebel-lum.

2. Small sledge hammer for abovepurpose or for vigorous direct appli-cation where exceptionally highgoofage coefficients are obviouslypresent.

An unprecedented sale throughoutindustry is expected.

SER VICE FASTER,MORE PROFITABLY

... use orecise replacement

RCA SERVICE PARTSThese electrolytic capacitors are exact replacements for the units originally built into

RCA VICTOR TV SETS. Mechanically and electrically they fit...exactly right! Like

all RCA SERVICE PARTS, they mean faster replacement-less time on the bench. More,

too, they help give assurance that top performance will be restored.

Stringent manufacturing controls in the production of RCA electrolytic capacitors

assure extremely low leakage currents and the ability to handle very heavy ripple

currents-without deterioration. They have excellent self -healing properties-for long

service life, and maintain capacitance values under severe variations in temperature.

So, next time you "call" for an RCA Victor radio, phonograph, or TV set, contact

your RCA distributor for fit -right, install -fast RCA SERVICE PARTS and keep your

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TECHNICIAN March, 1956 Circle numbers on free inquiry card, p. 33, for more product data. 55

HIGH EFFICIENCYat Lower Cost

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NE W Sarkes Tarzian High Density Rectifiers providesafe field replacements at lower cost. Better for you and betterfor your customers. Get the new High Density Rectifiers at yourdistributors. The same high performance and long warrantyas all Sarkes Tarzian Selenium Rectifiers.

ModelNo.

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Plate Overall ReplacesSize Length Model

250A 130 250 1.25" sq. 1 7/8" 200-250300A 130 300 1.4" sq. 1 7/8" 300350A 130 350 1.6" sq. 2 5/32" 350400A 130 400 1.8" sq. 1 .5;11" 400500A 130 500 1.8" sq. 1 15/16" 500

Write for your copy of the latest Replacement Guide. Address Dept. T-1.

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In Canada: 700 Weston Rd., Toronto 9, Tel. Murray 7535 Export: Ad Auriema, Inc., New York City

Use "Phantom" Antenna


may be used in the phantom for eachchannel desired, or for those that arewidely separated from each other infrequency. The same idea is practicalfor UHF signals, with a simple an-tenna acting as the phantom.

The receiver's pickup antenna maybe of the same type used in thephantom, or it may be different.Usually a high -gain type is desir-able. A directive type is also desir-able, since it can be beamed on thephantom and discriminate againstother ghost -producing reflections. Insome cases, an all -wave type willserve the purpose where more thanone channel is required. This shouldbe determined by a field -strengthcheck after the phantom is up.

REBROADCASTSTATICN(S) /ANTENNA ANTENNABROM INTERCEPT

UNE

OBSTACLE

Fig. 4-Twin phantom system (2 antennasl.

Another variation in the phantomprinciple is shown in Fig. 4. In thisinstance, good pickup for the phan-tom, was only possible at the for-ward edge of the obstructing build-ing. From this point, however, signalreradiation into the "valley" wherethe set's pickup antenna had to belocated was not possible. For thisreason, the functions of picking upsignal initially and of retransmittingit could not be combined in a singleantenna. The phantom thereforeconsists of an interceptor antennaconnected, by a run of transmissionline, to a rebroadcast antenna at afavorable spoton the opposite edgeof the roof.' To prevent interaction,the two elements of the phantomshould be several wavelengths apart-but this is usually the automaticresult of the nature of such an in-stallation. Where such a system isused, it may be possible to interposea booster amplifier in the transmis-sion line between the two antennasfor still greater signal strength.


"Package" TV ComponentsA new "package" of TV compo-

nents that will insure good receptionat reduced cost, in color as well asmonochrome sets, was unveiled byStandard Coil Products, Inc.

The package consists of a tuner,i-f strip, sync generator and delayline. Circuitry for the 4 major unitsin the package will be made avail-able free to manufacturers who wishto make the equipment themselves.The finished units may also be pur-chased directly from Standard.

Edison Award to Blind HamRobert W. Gunderson, blind since

birth, has been awarded GeneralElectric's Edison Radio AmateurAward for designing more than 30types of test instruments for theblind. Bob Gunderson, W2J10, pub-lishes the only braille electronicsmagazine.

Selenium Conservation KitTo spur its previously announced

plan to help the government in itsefforts toward conserving scarceselenium, Federal Tel. & Radio Co.is sending its distributors conserva-tion program kits.

For use by the distribs themselves,dealers and service techs, the kitscontain reproductions of the govern-ment's appeal to salvage selenium,letters explaining the manufacturer'sprogram, and banners and circularsfor wall display to act as a constantreminder. Federal is offering 8 to 12cents each for returned rectifiers,depending on size.

Sylvania Investment

To show graphically the amount SylvaniaElectric Products Inc. spent in engineering,designing and tooling up for its 1956 tele-vision sets, the Bank% of America piled five -million dollars in cash around a "Cabinet ofLight" set. Enjoying the affluent feeling areJeanne Kessey, "Miss San Francisco," andBernard C. Holsinger, General Sales Managerof Sylvania's Radio and Television Div.

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Low noise all -triode circuit

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36 -Hr. Week for TechniciansHow Would You Like a Full Year's Pay-With 26 Weeks Off?

Harper Electronic Lab, a TV -elec-tronic repair business at 485 Dear-born Ave., Toledo, Ohio, has come upwith a plan that has solved the "sun-down service" problem and that alsopleases its staff of 18 employed tech-nicians. Providing TV service in theevenings was quite a problem, what

with overtime pay, until the planwent into effect. Here's how:

Employees are divided into twoshifts. One shift works 12 hours aday-from 8 a.m. to 9 p.m. with two"breaks" for lunch and supper-onThursday, Friday and Saturday.This same shift is off6unday. Then it

One Focalizerfor allpicturetubes.

"'o.-

FREE!Catalog 78,listing completespecifications ofthe QUAM QF-4UniversalFocalizer Unit.

QUAM-N I CHOLS COMPANY226 East Marquette RoadChicago 37, Illinois

4New ceramic magnets and extendedfocusing range eliminate the needfor more than one model . . . yetprovide maximum resolution withminimum spot size.

Installs in minutes, adjusts in seconds.

The QF-4 has a newly designed"quick -setting" picture centering lockand is supplied with a soft aluminumblank mounting bracket that iseasily drilled to fit anymounting arrangement.

LIST PRICE $4.25

works 12 hours a day on Monday,Tuesday, and Wednesday. Then thefollowing work week, beginning withthe following Thursday, it is off dutyfor an entire week. During this time,the second shift takes over for asimilarly divided work week. Withboth shifts thus alternating, the shopis operating 12 hours a day for 6 daysa week.

Old Plan vs. New

Before the Harper plan went intoeffect, employees put in a regular 40 -hour 5 -day week, with the shop clos-ing down at 6 p.m.-and thus losingthe cream of the repair business,evening servicing. Now they drawthe same salary for the 36 -hourweek. Although employed tech-nicians lose their 2 -week vacationwith pay, this 80 -hour pay -without -work period is made up for by thefact that the 36 -hour week givesthem 208 hours less of working timeat the same pay they were gettingwith the old 40 -hour week. If aworker wants 2 weeks off in a row,he can switch with someone on theother shift. One strict rule on whichthe Harpers insist is that employeesrefrain from taking on other jobsdukring their alternate weeks off. It isfelt that this would impair their jobefficiency.

Employees Like It

Employee reaction to the plan isf'orable. One of the Harper benchawn says, "It's just like having a va-cation every other week." This tech-nician, Richard S. Baldwin, uses histime off to indulge in his favoritesport, skin diving, and to build radio-coQtrolled model planes. OtherHarper men use their time off forvarious other pursuits and hobbies.EMperimental electronics, ham radio,gardening, working around thehouse, hunting, and fishing are someof the activities made possible on afull scale by the novel work -weekarrangement. Frequent family vaca-tion trips in\he summertime are alsomade possible.

There are many pros and cons thatcan be argued over the plan, but itwould seem to have definite advan-tages for people who like to breakup the work routine frequently. Inany case, the plan has worked out forthe Harper establishment.


-.--r-wswalaW---w.....-...--wwwwwwmairstornsmar

Association News

RSA ElectsRadio Servicemen's Association,

Trenton, N.J., has elected its officersfor 1956-57: Pres. Francis Wolf,Vice-Pres. David Van Nest, Sec.Michael Toth, and Treas. CharlesRebman.

NEDA Statement ScoredAn article in the January issue of

NEDA Journal claiming that propo-nents of licensing laws are a handfulof local servicemen with poor repu-tations who hurt the independent hasbeen attacked by association leaders.NATESA Pres. Frank Moch haslashed out at this stand claiming thatresponsible professionals want to re-move the service industry from thetinkerer status, and to eliminatepresent jungle business methods.Forrest Baker, chairman of recentlyformed American Electronics Coun-cil, countered the NEDA statementwith the claim that five years agoless than 20% of established, ethicaloperators gave licensing a passingthought; today more than 80% havebeen forced to conclude that licens-ing is the independent's only salva-tion.

FTRSAP Officers SwornThe Federation of Television-Raz.

dio Service Associations of Penna.have sworn in the following officers:Chairman Bert Bregenzer, Vice -Chairman Wm. Morrow, Sec. LeonHelk, Recording Sec. Ray Black-wood, Treas. L. B. Smith.

RTA ElectsRadio & Television AssociatiOn,

Springfield, Ohio, reports the elec-tion of Pres. Marvin Miller, Vice-Pres. Paul Boller, Sec. Wade Camp-bell, Treas. Adolph Stamguts.

Proposed Licensing Provisions,'The proposed ordinance regulating

TV repair, sponsored by TelevisionService Association of Michigan pro-vides that all repair establishmentsbe licensed, and each must have alicensed technician responsible for allwork. Penalties include. a possibleloss of license, $500 fine. and 60 daysin jail. The mayor -appointed 7 -manboard of examinerst.which conductslicense exams and,hears complaints,would include thrge techs, TV schoolstaff member, TV station engineer,one man from the City Safety Engi-neering Dept., and one from Policecommunications.

Customer Poll on Service-Alameda County, Calif.

TV Flashes, official organ of theTelevision Radio Association ofAlameda County reports on a surveyamong TV owners to determine howthey choose a technician when theirsets break down. Most people lookfor a nearby service establishment,it was found, regardless of how theydetermine which one in the neigh-borhood will be used.

Recommendations from friendsand neighbors ranked high in deter-mining the parncular choice. Somepeople use the classified section of

the phone book, and pick the near-est service tech to them that is listed.

Dealer Identity Cards-Fort Worth, Texas

With the cooperation of local dis-tributors, the Fort Worth Radio andTelevision Association has suc-ceeded in contacting local purchas-ers of parts for the various phasesof the radio and TV field. Each manhas been checked and classified asto the category into which he falls,such as full-time professional, part-time, trainee, ham operator, or


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Ideal for use in shop - just connect to receiver.

The new Sel-Son CRT Substituter now makes it pos.sible for servicemen on calls to see at a glancewhether trouble is in television tube or chassis, with-out removing the tube, yoke, focus arrangement orion trap from set. Once the service technician has asolution to the problem, it is a simple matter to re-move only the chassis, without disturbing the picturetube and components in the cabinet. In his shop hecan connect the receiver to the CRT Substitute, andoperate it on his bench or shelf.

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TECHNICIAN March, 1956Circle numbers on free inqu;ry card, p. 33, for more product data. 59

Association News

(Continued from page 59)experimenter. Identification cardswere issued on this basis, with theclassification clearly stamped oneach card, for use in making pur-chases from local distributors. Salesmade to card holders are made inaccordance with fair trade practicesand with respect to classification.

The project has been undertakento help the service industry as awhole and to protect the public,

points out C. IL Morey, pres. of theFt. Worth Association. He alsostates that service shops report anincrease in business since the pro-gram was put into operation. Manypart-time and other marginal opera-tors appear to have lost interestsince written applications have be-come necessary to procure thewholesale electronic purchase cards.

NATESA Convention SetThe 1956 NATESA convention has

been set for Sept.'14-16 in Chicago.A program of lectures, seminars andfellowship is planned. Departing

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from the practice of previous years,a parts show exhibition will not beheld. A special convention sectionwill be published in the NATESAScope, to be distributed at the meet-ing.

Group Meets to Form NewNational Association

Representatives of associationswhose membership voted against ac-cepting the affiliation proposalsbrought back from the Indianapolisunity meeting held last fall gatheredin Chicago to discuss the formationof a new national service association.Temporary officers elected to headthe group, known as AEC, AmericanElectronics Council, until an officialname is selected, are: Forrest Baker,Director TEA of Texas, Chairman;Bert Bregenzer, Pres. FRSAP ofPenna., Vice -Chairman; HowardWolfson, Chairman ARTS of Chi-cago, Secretary; and Murray Bar-lowe, Pres. R&TGLI of New York,Treasurer.

Self -Imposed LicensingDisillusioned by unsuccessful at-

tempts to get a licensing bill throughthe City Council, a group of NewYork City service technicians havetaken steps toward licensing them-selves.

The Associated Radio & TV Serv-icemen of N. Y., membership 400, isadopting a program of self-imposedlicensing that will embrace the pro-tective features of a bill which diedin a City Council committee in 1954.

"We want this to be an honorableprofession," says Max Liebowitz,chairman of the ARTSNY board ofdirectors. "We propose to grade ourown members technically and super-vise their activities. Each will takean oath to a code of ethics and, if itis determined that a member hasdealt unfairly with the public, hewill lose his association license."

The program is expected to getunder way about May 1.

FTRSAP Nixes NATESAAs reported in an earlier issue of

TECHNICIAN (February 1956),local delegates to the Federation ofTelevision -Radio Service Associa-tions, P.O. Box 61, Carbondale,Penna., carried to their respectivechapters the decision as to whetherthe Federation should join NATESAfor the sake of unity in a single na-tional group.

At a subsequent meeting ofFTRSAP, delegates reported thattheir local chapters had rejected theproposed plan for affiliation. As aresult, the Pennsylvania Federationis making no plans for joiningNATESA.


Two -Way Radio Systems


be very carefully studied.Size and shape of the area to be

covered is quite important, as it de-termines the type of antenna needed.if the base station is at or near thecenter, an omnidirectional antenna.such as the various "ground -plane"types, should be used. See Fig. 2. Ifthe station is located at the extremeedge of its territory, as we were,then some form of directional an-tenna should be used, both to gainefficiency and eliminate interferencewith other stations using the samefrequency. Our base is located atthe northwest corner of our terri-tory; therefore, we selected a corner -reflector antenna. The pattern of thisunit gave us much better coverage,and eliminated unnecessary radia-tion of signals into other areas.

Accessibility Important

One more important factor in theselection of a transmitter site is all-weather accessibility, for motorvehicles. This will not only simplifyconstruction problems, but makemaintenance much easier. Periodicchecks upon equipment must bemade, and also emergency repairs.A site that is accessible only byjeep, as ours is, makes this taskmuch more onerous, especially invery bad weather!

Selection of equipment is alsovery important. Several major man-ufacturers, among them Motorola,Dumont, RCA, GE, and others, aremaking two-way radio equipment,and this is usually well-built equip-ment. Beware of the so-called "bar-gains" in this kind of equipment.They can easily prove more costlyin the long run, and that is whatmust be considered when installinga system like this. High -qualityparts and competent engineering arefar more important than price. Inaddition, the reliable manufacturersprovide a variety of invaluable serv-ices: they will help you get the FCClicense, select the equipment, pro-vide field engineering help in work-ing out any special problems thatmay arise, and also maintain partsdepots all over the country to givefaster service on special parts whichmight be needed,, Take advantage ofthese; they will speed up the joBimmensely.

When making application for li-cense, be sure to include more mo-bile units than actually will be

needed. In other woicts, if your sys-tem now calls for three mobile units,apply for five, or better still, ten.This does not imply any obligationto install all of them now: it merelysaves you much paper work later, ifmore mobile units are added. If youapply for three and install three, ad-ditional mobile units require a com-plete refiling of your application,with much unavoidable delay. Ifyour application calls for ten mobileunits, you simply install the newunit, write the FCC a letter of noti-fication, and the job is over.

Maintenance work on these sys-tems requires the possession of a

FCC license, of at least 2d -class Ra-diotelephone or higher. If no onein the community has such a license,there are usually maintenance firmswithin a short distance who special-ize in this kind of work. They havethe necessary frequency monitors,and other equipment needed to makethe periodic checks required byFCC Power output, frequency, andmodulation must be measured everysix months, by FCC regulations, andthe results entered in the log. Thisis the maintenance technician's re-sponsibility. The receivers, of coursemay be serviced by any competent


Find out how YOU CAN INCREASE YOUR INCOMEby installing and maintaining mobile communications andmicrowave equipment! so NE es No mi v

Over 700,000 transmitters! Yes,without considering any govern-ment, military or amateur equip-ment, there are almost 3/4 of a mil-lion transmitters in daily use-andonly an FCC licensed techniciancan install and maintain thosetransmitters.

The field of mobile communica-tions and microwave has literallysky -rocketed in recent years. Itwill grow even faster in the com-ing years. "Private" radio -phonesystems are in great demand. Morepeople are requesting regular "cartelephones" from the telephonecompanies. Microwave links arereplacing land wire. Radio stationsare going "remote."

These developments are not be-

ing restricted to big cities. Thegrowth is just as extensive insmaller town and rural areas. But,in all areas, the supply of qualifiedtechnicians is not sufficient. Equip-ment users are not getting adequateservice in many areas. In manycases, they must get technicianshundreds of miles away.

You are undoubtedly a good ra-dio -television serviceman. Why notadd a commercial FCC license toyour qualifications and become anexpert electronics technician. YourFCC license will open the door tohundreds of types of jobs whichyou don't handle now. Regardlessof the job, if it involves electronics,Cleveland Institute will help youprepare for it.

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TECHNICIAN March, 1956Circle numbers on free inquiry card, p. 33, for more product data. 61

"MAKERS OF THE FINEST SETSUSE 'EM !"

"Manufacturers of America's finest radioand TV sets are Tung -Sol customers.As a result, Tung -Sol Magic MirrorPicture Tubes and receiving tubes aremade to the very highest of all set-

makers' performance specifications!"

TUNG-SOL®Magic Mirror Aluminized

PICTURE TUBESTUNG-SOL ELECTRIC INC., Newark 4, N. J. Soles Offices: Atlanta,Columbus, Culver City, Dallas, Denver, Detroit, Melrose Park (Ill.),Newark, Seattle.

News of the Industry

After years of research in semi -conductors, SPRAGUEELECTRIC CO. is starting production this year of transistors.First in production will be surface -barrier transistors, undera licensing agreement with PHILCO CORP. . . . R. C.SPRAGUE, founder and board chairman of SPRAGUE ELEC-TRIC, was named chairman of the Federal Reserve Bank inBoston.

JAMES H. CARMINE is stepping down as president ofPHILCO CORP. to get away from the burden of day-to-dayduties, but will continue as an active member of the Board ofDirectors and Finance Committee.

In Operation Cue, AEC test atomic blast in Nevada, severalJFD antennas and other products were installed at the testsite. After the explosion, the antennas had suffered only super-ficial bending, although the buildings on which they weremounted were demolished.

TEXAS INSTRUMENTS INC., electronics and geophysicalfirm noted for its pioneer work in transistors, has acquiredthe BURLINGTON INSTRUMENT CO., maker of electricalindicating instruments.

GUS and BEN SNYDER, heads of SNYDER MFG. CO., aremapping out an expansion plan for their Canadian subsidiary.A prograin for stepped -up SNYDER sales throughout theworld was formulated at an international sales meeting in gPhiladelphia.

SECO MFG. CO., test equipment maker of Minneapolis,Minn., has appointed J. WARREN BOSIGER as its TechnicalField Rep.

The MAGNAVOX CO. and the SPARKS-WITHINGTONCO. have concluded an agreement whereby Magnavox willtake over the service of SPARTON radio and TV receivers,formerly manufactured by Sparks-Withington. Magnavox isnow manufacturing a line of fringe -area TV receivers tosupply former Spartan dealers . . . Magnavox has also openeda Color TV Service School, in Chicago, for its midwest dealersand authorized service agencies.

THOMAS C. FLYNN was named public relations rep forthe FEDERAL TELEPHONE AND RADIO CO. of Clifton, N. J.

The position of Mgr. of Govt. Sales and Specifications atERIE RESISTOR CORP. has been filled by the appointmentof J. C. VAN ARSDELL.

MERIT COIL & TRANSFORMER CORP. has a new vicepresident and comptroller. He is KENNETH H. GRADY.

To create consumer demand for its radio and TV tubes,GENERAL ELECTRIC is launching a big spring promotionpitched as "The Greatest Show of Worth."

MERLE W. KREMER has been appointed asst. gen. mgr. ofthe Parts Div. at SYLVANIA ELECTRIC PRODUCTS.

ROHN MFG. CO. now uses a tractor -trailer for deliveringits antenna towers that serves a dual role. The custom -designed trailer, with a few tower sections set around, makesa crowd -gathering spectacle in front of a dealer's store. Deal-ers interested in the display can write direct to the manufac-turer or contact local Rohn reps.

Directors of MOSLEY ELECTRONICS, INC. elected 2 newvice presidents. JACK R. MOSLEY is vice president and asst.mgr. GEORGE E. MOBUS is vice president in charge of salesand advertising.

New president of UNIVERSITY LOUDSPEAKERS, INC. isSIDNEY LEVY. New secretary-treasurer of the company isARTHUR BLUMENFELD.

GENERAL DRY BATTERIES, INC. has set up 11 ware-houses across the country to insure fast delivery (48 -hr.shipment) for its customers. Warehouse locations are Atlanta,Ga.; Boston, Mass.; Cleveland, Ohio; , Dallas, Tex.; Denver,Colo.; Dubuque, Iowa; Los Angeles, Calif.; Memphis, Tenn.;Portland, Ore.; San Francisco, Calif,; and silver Springs, Md.

Appointment of WH.,BERT H. STEINKAMP as vice presi-dent in charge of sales was announced by WESTON ELEC-TRICAL INSTRUMENT CORP., a subsidiary of DAYSTROM,INC. Also appointed, as vice president and gen. mgr. of Wes-ton, is SAMUEL J. CHILDS.

(Continued on page 68)62 Circle numbers on free inquiry card, p. 33, for more product data.

TECHNICIAN Mardi, 1956

Reps & Distributors

JENSEN MFG. CO. of Chicago has named 3 more whole-salers to handle 2 -step distribution of its quality loudspeakers:CHEMCITY ELECTRONIC DISTR. of Charleston, W. Va.,REED RADIO & SUPPLY CO. of Springfield, Mo., and PRE-CISION RADIO LTD. of Honolulu, Hawaii.

CARTWRIGHT & BEAN of Memphis, Tenn., will representthe QUAM-NICHOLS CO. in the Southeast.

WILLIAM I. DUNCAN will be capacitor representative forthe Industrial Div. of JFD MFG. CO. in the Middle Atlantic'area. Mr. Duncan's territory will range from southern N.Jersey to northern Virginia.

At a well -attended meeting of the EMPIRE STATE CHAP-TER OF "THE REPRESENTATIVES," the following werere-elected to office for 1956: JOHN L. STONE, pres.; GORDONLE ROY, vice pres.; MARSHALL BALL, secy.; and JOSEPHS. MARCY, treas.

PRECISE DEVELOPMENT CORP. of Oceanside, N. Y. hasnamed LEN FINKLER as Eastern Canada rep.

HARRISON REYNOLDS CO., New England reps, announcesan organizational change. The newly formed SALES ENGI-NEERING CO., with offices at Sugar Lane, Newtown, Conn.,will involve most of the personnel of the former Reynoldsorganization.

The addition of two more men to the sales and engineeringstaff of PERLMUTH-COLMAN AND ASSOCIATES of Cali-fornia brings the total of salesmen and engineers to 18. New-comers are HARRY LINDEN, field engineer, and EMERSON(BUD) MILLER, technical sales.

Catalogs & Bulletins

RECEIVE THESE CATALOGSdescribed here. Simply write in number given at end of eachItem of interest on postage -free inquiry card, page 33.

TV ACCESSORIES: Data sheets on rotary stripper for shieldedcables, model TV -42 2 -set TV coupler, and DA8-B distributionand isolation amplifier for up to 8 117. sets on a single antenna.Blonder -Tongue Laboratories, Inc., 526-636 North Ave., West-field, N. J. (Ask for B3-1)

SPEAKER ENCLOSURE KITS: Brochure 78A8 illustrates and de-scribes a variety of Hi-Fi speaker enclosure Kwikits of severalsizes. Desk LA8, University Loudspeakers, Inc., 80 S. KensicoAve., White Plains, N. Y. (Ask for B3-2)

ELECTRONIC SUPPLIES: 72 -page supplement to distributor's main1956 catalog. Supplement No. 155. Allied Radio, 100 N. WesternAve., Chicago 80, Ill. (Ask for B3-3)

SHIELDING MATERIAL: Release 102 gives characteristics and ap-plications of low-level Co-Netic shielding. Magnetic ShieldDiv., Perfection Mica Co., 1829 Civic'Opera Bldg., 20 N. WackerDr., Chicago 6, Ill. (Ask for B3-4)

PHONO STYLI!: Dealers' price list No. 56212, distrib price listNo. 5621, and Supplement 1 to 5th edition of replacementneedle guide are available. Recoton Corp., 52-35 Barnett Ave.,Long Island City 4, N. Y. (Ask for B3-5)

SILICON RECTIFIERS: 8 -page brochure presents electrical andmechanical characteristics of line of miniature silicon rectifiers.Sarkes Tarzian, Inc., Rectifier Div., 415 N. College Ave., Bloom-ington, Ind. (Ask for4B3-6)

AUDIO, HI-FI: 1956 High Fidelity Audio Guide, a 132 -pagecatalog, lists equipment for hobbyist and professional, Hi-Fiand PA. Terminal Radio Corp., 85 Cortlandt Street, New York7, N. Y. (Ask for B3-7)

(ConLnued on page 68)

" FINEST FOR REPLACEMENT.TOO!"

"Whether you're a wholesaler or aservice dealer, Tung -Sol Tubes-thetubes that leading set -makers use-are your best bet for highest profitsand customer good -will. You can builda reputation on Tung -Sol quality!"

TUNG-SOL®dependable

RECEIVING TUBESTUNG-SOL makes All -Glass Sealed Beam Lamps, Miniature Lamps,

Signal Flashers, Picture Tubes, Radio, TV and Special PurposeElectron Tubes and Semicondudor Products.

TECHNICIAN March, 1956 Circle numbers on free inquiry coed, p. 33, for more product data. 63

A Valuable Service for Television Technicians-

SINGLE SCHEMATICS,

2551 Each

The publisher of TECHNICIAN is receiving so

many requests for reprints or additional copies

of its Circuit Digests that it is making single sche-

matics available at 25c each, postpaid and the

complete group, as published in any issue, for

50; postpaid. Schematics for all receivers indexed

are in stock. Be sure to order by Circuit Digest

number and give brand name and chassis num-

ber to prevent error.

Address Reader Service Dept., TECHNICIAN,

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Currency or postage must accompar y order.

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Day by day Industrial plants are adding niiaelectronic devices-(or sorting, counting, clieckiiegalmost .y control job you can name. Cash in onindustry's great need for men who can keep thesedevices in top working order. Make more money.feel more secure, doing work that is second na-ture to you. With what you already know aboutelectronica you have a long head start in a fieldjust beginning to boom. GET INTO IT RIGHTNOW with the help of

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No long sessions on math or theory! These 4 practical volumes show you how to keel.the plaid's electronic equipment working . . . how to locate and correct tube andcircuit troubles . . . how to install, service, and maintain even brand new equip-ment without being stumped by new cricuits.

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4 volumes (1390 pp..1050 illus.): Chute'sElectronics in Industry

Miller's Maintenance Men-sal of Electronic Con-trol

Markus & Zelurrq Hand-book of Industrial Elec.trollies Circuits

& Fmlinestock'sElectron Tubes in In-dustry

64 Circle numbers on free inquiry card, p. 33, for more product data

ieldverthse in the

1956TECHNICIAN

BUYERSDIRECTORY

to be published in theMAY ISSUE of

TECHNICIAN& Circuit Digests

The only directory of its kind in the TV -electronic service field reaching 52,000of the industry's key personnel

9ncluele4-Complete listing of electronic products.-Up-to-date list of manufacturers.-Extensive listing of trade names.-Directory of electronic distributors.-Directory of representatives ("Reps")-Lists all known service ossociations.-Complete finding index-alphabetical.

And . . .

-The sensational, exclusiveLOCALIZER INDEX

Your Localizer listing, immediately under your free edi-torial listing in the Alphabetical List of Manufacturers,may include your executive, engineering and sales per-sonnel; the trade or brand names of your products; a listof your branch or regional offices; and, most important, acomplete ist of your representatives, arranged alpha-betically by cities.

These Locclizer listings ore a new selling punch, deliveredat the point of sale. They minimize long distance tele-phone and telegraph charges, reduce time-consuming cor-responden:e, increase the number of inquiries, speedservice to the customer and help to get orders in placeswhere local bias exists.

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New Books

TV REPAIR QUESTIONS AND ANSWERS. BySidney Platt. Published by John F. Ri-der Publisher, Inc., 480 Canal St., NewYork 13, N.Y. 128 pages. Paper cover.$2.10.

Over 115 technical questions concern-ing the practical aspects of servicinghorizontal and vertical oscillators andsync systems, and AFC circuits, are an-swered in considerable detail. Chartslist tubes used in these circuits in com-mon receivers. This volume should behighly appreciated by the already ex-perienced technician.

SPECIALIZED HI -Fl AM -FM TUNER MANUAL,Vol. 1. By John F. Rider LaboratoryStaff. Published by John F. Rider Pub-lisher, Inc., 480 Canal St., New York 13,208 pp. Paper cover. $3.50.

This first of a series of specializedmanuals presents schematics, servicedata, technical information, responsecurves and other pertinent material onthe 1950-1955 production of 21 leadingmanufacturers of this type of equip-ment. Included are FM -only tuners,combination tuners, and tuners that in-corporate complete preamplifier or pre-amplifier -amplifier facilities. Servicetechs interested in Hi-Fi service shouldfind the volume an invaluable aid.

TELEVISION-HOW IT WORKS (2nd Edition).By J. Richard Johnson. Published byJohn F. Rider Publisher, Inc., 480Canal St., New York 13, N. Y. 352pages. Leatherette -finish paper cover.$4.60.

Stabilization of TV receiver circuitrysince the original edition of 1948 hasprovided the author with the oppor-tunity to make this edition a compre-hensive and definitive exposition of thereceiver, with all variations considered.He has made good use of the opportun-ity. The pitfalls involved in merelybringing an existing volume up to datehave been avoided; this book is all newfrom beginning to end. Graphic illus-trations well -integrated with the textenhance the impression of complete yetcomprehensible treatment. This is inthe nature of a standard reference forthe practicing technician and thestudent.

LIMITERS AND CLIPPERS (Review Series). ByAlexander Schure, Ph. D., Ed. D. Pub-lished by John F. Rider Publisher, Inc.,480 Canal St., New York 13, N. Y. 64pages. Paper cover. $1.25.

The functions and applications of li-miters and clippers form the basis forthis slender text, including treatment ofvarious types. Series and parallel diodelimiters are illustrated and explained,as well as triode limiters. Also coveredare the differences between saturationand cutoff limiting.


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time, the range usually offered. Will sync wave formdisplay up to 5 Mc and better. Printed circuit boardsstabilize perforn ance specifications and cut assemblytime in half. Fcrmerly available only in costly Labtype Scope. Features horizontal trace expansion forobservation of rulse detail - retrace blanking am-plifier - voltage regulated power suppl-, -3 stepfrequency comrensated vertical input - low ca-pacity nylon bushings on panel terminals - plus ahost of other fine features. Combines peak perform-ance and fine engineering features with k w kit cost!

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TECHNICIAN March, 1956 Circle numbers on free inquiry ccrd, p. 33, for more product data. 65

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Leading manufacturers of origi-nal -equipment auto -radiosspecify Vokar vibrators as com-ponents for installation on tluproduction -line. Vb

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Ideas for Test Equipment 1

SELECTIVELYLIGHTEDSCALE

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SCALE LIGHT AC D C R

INDICATORS VOLTS VOLTS

RETRACTABLESIGNAL INJECTOR

LEAD

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PROBE HOOK

SI 3

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ON

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RECESS

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AC LINERECEPTACLE

RETRACTABLELEAD

This is the first in a series of shortfeatures summarizing some of thekey features techs want to see ininstruments for TV servicing. It is acombination of highlight suggestionscontained in several entries toTECHNICIAN's Test EquipmentContest, and consequently can not becredited to any one entrant.

The combined "dream" instrumentshown in the illustration is a self-setting VTVM with simple signalsource. The heart of the unit is asingle probe for ac, dc and ohms,which contains one or more remotecontrol buttons for selecting the de-sired setting. Pressing the buttonactuates a stepping relay or similardevice in the unit which sets the in-strument for a particular measure-ment. At the same time, only onescale on the meter face is selectivelylighted to correspond with the meas-urement setting, making readingsquick and unambiguous. One ofthree scale light indicators light upto show at a glance whether readingis ac volts, dc volts or ohms.

A small line voltage meter con-stantly monitors the line powersource, and an ac line receptacle isprovided for soldering iron or otherequipment.

An additional feature is a simplesignal source which may be injectedinto a circuit by a small probe toobtain a fundamental indication ofthe set's functioning. It may consist

of a noise generator such as a built-in buzzer and step-up coil to pro-duce spark induced r -f and a -f. Thiscan locate dead sound circuits bynoise, dead video by horizontal bars,and dead i-f and r -f by noise pat-tern. Another one of many alterna-tives is a single -transistor Colpittsoscillator operating at an audio fre-quency to make a quick check whena sweep or signal generator is notrequired.

A small hook on the probe allowsit to be hung on a connection undertest, leaving the hands free. All leadsand handle are retractable into thecase or recessed for flush mounting.Overload and polarity reversal pro-tection is provided, and unit is shockmounted.

TV Plays Traffic Cop

Scotland Yard chiefs and top Brit-ish Army brass attended a recentdemonstration of air -to -ground TVat Filton, England.

An industrial TV camera wasmounted in the door of a helicopterto pick up and transmit pictures ofhighway traffic, docks, shipping, andharbor installations, from heightsbetween 500 and 1000 feet. A trans-mitting antenna was attached to thehelicopter's tail skid. From station-ary pickups on the ground, observ-ers were able to get a bird's-eyeview of traffic conditions.

tt


.=rwe

New Books


RADIO PHILATELIA. By Herbert Rosen.Published by Audio -Master Corp., 17 E.45 St., New York 17, N.Y. 48 pages.Paper cover. $2.00.

Here is an unusual and specializedbook for techs interested in stamp col-lecting. Many stamps from all over theworld, all devoted to telecommunica-tions, are reproduced. Many commemo-rate the great men and events in radio -TV history.

THE VTVM. By Rhys Samuel. Published byGernsback Library, Inc., 25 WestBroadway, New York 7, N. Y. 224 pages.Paper cover; $2.50. Hard cover; $4.60.

Characteristics of the instrument, ascompared to other types of practicalmeters, are given due consideration,together with examination of the whysand wherefores of VTVM operation.Also presented are the many applica-itons of this versatile aid in the severalareas of electronics, including the useof such accessory devices as probes andcables. Also treated are the role of theVTVM in troubleshdoting, and mainte-nance and repair of the instrumentitself.

TV FIELD SERVICE MANUAL, VOL. 5. Editedby Harold Alsberg. Published by JohnF'. Rider Publisher, Inc., 480 Canal St.,New York 13, N.Y. 148 pages. Papercover. $2.40.

Another in the publisher's growingseries of quick -reference servicing in-formation, this volume covers Motorolaand Philco TV receivers from 1949 to1955. Tube and chassis layouts are con-veniently arranged facing lists of usualsymptoms and their trouble sources.Plastic binder allows pages to remainopen flat on work bench.

PRACTICAL RADIO SERVICING. By WilliamMarcus and Alex Levy. Published byMcGraw-Hill Book Co., 327 W. 41 St.,New York 36, N.Y. 559 pages. Hardcover. $8.50.

Assuming the reader has no previousknowledge of radio, this substantial vol-ume explains how radios are repaired,instruments used and basic trouble-shooting shortcuts.

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News of the Industry


A 40 -HOUR COURSE in color TV,intended to train 20,000 color TV serv-ice technicians throughout the country,has been inaugurated by PHILCOCORP. Servicers representing allPHILCO distributors are being broughtto Philadelphia factory headquarters ingroups of not more than twenty. Aftertraining, they will return to their re-spective areas to conduct local colorTV schools.

SIMPSON ELECTRIC CO., Chicago,honored its founder, RAY R. SIMP-SON, on the occasion of his fifty yearsin the electrical instruments industry.

KENWOOD ENGINEERING CO.,INC., Kenilworth, N. J. named SAM-UEL YURMAN as sales mgr. of thefirm.

BROOKS A. KAFKA has been ap-pointed sales manager in the GEN-ERAL ELECTRIC cathode ray tubesub -department at Syracuse.

A. C. ELLES has been appointed gen-eral sales manager of INDUSTRIALDEVELOPMENT ENGINEERING AS-SOCIATES, INC. (I.D.E.A.), Indian-apolis, Ind.

Catalogs & Bulletins


DISPLAY: Colorful poster to stress anten-nas is offered by Taco for window dis-play or store use. Also available arecards for mailing to customers invitingantenna check. Write to Technical Ap-pliance Corp., 1 Taco St., Sherburne,N.Y. (Ask for B3-8)

CATHODE REJUVENATOR TESTER: Data sheetdescribes portable CRT tester which canbe used to test and repair picture tubeswithout removing tube from the re-ceiver. Complete with carrying case.Bulletin No. 102, B&K Mfg. Co., 3731 N.Southport Ave., Chicago 13, 111. (Askfor B3-9)

TUNER: Bulletin T-90 describes new uhftelevision tuner developed to meet radiofrequency interference objectives ofboth RETMA and the FCC. Radio Con-denser Co., Davis & Copewood Sts.,Camden 3, N.J. (Ask for B-3-10)

TEST EQUIPMENT: Combination condensedcatalog and direct -mailer describes thecomplete EICO Kit and InstrumentLine. Laid out to facilitate addressingor to "ride free" as an envelope stuffier.EICO, 84 Withers St., Brooklyn 11, N.Y.(Ask for B-3-11)

PUTS AN END TO ALL

LINE VOLTAGE HEADACHESIrsure full size, strength and sync of TV pic-ture when Now line voltage shrinks or weak-e )icture All units have baked wrinkle fin-ish, bLilt-in AC receptacles and 6 line cord

NEW! LVS-153 LINEVOLTAGE STABILIZER

A popularly priced, qualityautomatic voltage regula-tor. Stabilizes line for TV,radio or industrial usewhere load is constant. Input may vary between 95-130 volts, nominal outputvoltage regulated -4- 3%.One model covers 125 to300 watt range. Built-inautomatic relay turns stab-ilizer on with equipment.Waveshape is free fromdistortions and frequencysensitivity of resonanttype regulators.Sae: 10"x5"x9Y," highWeight: 10 lbs.List Price: 29.95DEALER NET: 17.95

NEW! LVB-350METERED VARIABLEVOLTAGE ADJUSTER

Constant duty unit used asstep-up or step-down. Au-tomatically operated -turns on and off with set.Easily adjusted by manu-ally turning 7position ro-tary switch until built -Involtmeter reads 115 voltsoutput. Has input switchpositions for 90 thro 130volts.Warts: 350 Weight: 7 lbs.Size, 7"031/4"0371/4" highMounting Centers: 5'sc

2'/,"L.st Price. 24.75DEALER NET: 14.85

LVB-1 1 7 LINEVOLTAGE BOOSTER

Multi tap selector switchrestorrs line voltages of 90Ore 135 volts to 117volts output. Calibratedneon indicator permits en-act voltage adjustment.Automatically operated-tans on and off with set.Overload fuse protectsagainst unsafe line In.Weans.Watts: 350 Weight: 4 lbs.Sizes 4s/"x 3Y.," x 3,/."

highMounting Centers,

2 3/16"x2V,"List Price: 17.95DEALER NET: 10.80

LVB "Jr" UP -DOWNVOLTAGE BOOSTER

Reliable, budget - pricedunit. Single switch pro-vides 10 volt boost or dropor straight -through line.Watts, 350 Weights 3 lbs.Size: 21/4" x 31/4" x 37."

highMounting Centers:

1 11/16"x21/2"List Price: 6.75DEAL ER NET: 4.05

PICTURE TUBE REJUVENATOR

Boosts CRT brightness. Units are resin treated;new design insures cool and buzz -free operation:8 oz List Price

a1480: Parallel sets. 6 leads $2.0049C: Parallel sets, 5 leads $1.50#50D: Series sets. 6 leads 51.75

#51E: Parallel, isolation. 6 leads $2.25x52: Parallel, 2 -step boost,

6 leads $3.75*53 : Universal, isolation &boost $4.25

Al le alove units are available for im-mod ate delivery at your local distributor

MICHOTINI1Tr andor yier Divisirn. Crest Laboratories, Inc

R:alaway Eeach 93, New York

68 Circle numbers on free inquiry card, p. 33, for more product data. TECHNICIAN March, 1956

CD's

Cubbest-bar none

in

molded tubular

capacitorsThe C -D "Cub" capacitor has provenitself the best on the market today-by out -lasting, out -performing, out-selling any other replacement capac-itor for radio or TV. For consistenthigh quality - always rely on C -D,the only tubulars with the built-inextras required in servicing setstoday. That's why distributors whoknow, carry the complete C -D line.

Special! "Cub -Kit" with bonus plas-tic service dispenser. IT'S FREE!

Ask your C -D Distributor. He'slisted in your local Classified Tele-phone Directory.

ONSISTENTLY

N ELL-Diji3ILIER

THERE ARE MORE C -DCAPACITORS IN USE TODAYTHAN ANY OTHER MAKE.

PLANTS IN SO. PLAINIISI.D. N. .1.1 min won:nu', WORCtliTen ANDemnenioct, MASS., 'MOWS'S ACE AND MOPS VALLCS. S.... INDIANAPOLIS.

IMO.: SANFORD AND PUCKA! SPAIN... N. C.. SVISIVIAlly, RADIANT

COAT., CLEVIMANO. OHIO.

Let's Look at Circuits


from differences in the phase rela-tionships of the signals as they varyon either side of center (resonance).The manner in which the diode de-tectors are connected across the out-put of the secondary also varies.

There is also the matter of dispos-ing of any misleading amplitude va-riations, such as those introduced bynoise pulses, so that the only ampli-tude variations appearing in the finaloutput are those that correspond tothe original audio modulation. How-ever, the basic processing throughwhich the FM signal goes has beendescribed here. It is wisest to holdother considerations and variationsfor separate discussion.

Westinghouse Color TV

Sometime in the middle of thisyear, Westinghouse plans to under-take quantity production of color TVreceivers. Heart of the set will bea new 22-!n. rectangular all -glasscolor crt.

With the use of compact receiverdesign around the tube, the sets arenot expected to be much larger thancurrent 21 -in. monochrome tablemodels. Compact table sets will beavailable in the line.

One of the factors enabling reduc-tion in size will be the extensive useof printed -circuit boards. The setsare expected to be competitivelypriced with color sets using smallerround pix tubes.

Visual Tube Inventory

Tube needs can be kept at the fingertips withSee-Lect-a-Tube method now available fromGE distribs. Dispenser holds 250 tubes inminimum space. Tubes stay stacked neatly,in order, without falling out or sliding againsteach other. Witi type numbers visible, stockcan be checked at a glance. Only 38 in.long, the unit can be wall mounted.

Internationalpresents

"AIR ORE"a new selenium replacement

:ectifier so outstanding it

Outperforms

them all!

12° to 15' lowercore temperature.

Overmad capacity 7times normal rating.

20% less aging.

Maximum air flow inany vertical mountingpositon (regardlessof degree of rotation).

Increased efficiencythroughout life.

AirKore provides these outstandingadvantages without sacrificing thebasic design of proven superiority -"center -support construction!

so GOOD -1GOOD -1T S

guarant6ed

for 1 year!

Compare any other rectifier with thenew AirKore. Guaranteed for a fullyear, this new design assures in-creased efficiency...will help cutcostly "call -hacks:' For products ofthe highest quality, manufacturedunder the most rigid standards inthe industry, look for the nameInternational.

This exclusive device pro-vides greater contact area -uniform temperature riseacross the plates-increasedefficiency.

AirKore design permits max-imum circulation of airaround the plates, throughthe core and spring itself.

.411\ A WORLD OF DIFFERENCE

...THROUGH RESEARCH

InternationalRectifier

C O R P OR A T IONEl Segur do, California Phone ORegcn 8-6281

In Canada: Atlas Radio Corp., Ltd.,50 Wingold Ave. W., Toronto, Ontario RU 1-6174

THE WORLD'S LARGEST SUPPLIER OFINDUSTRIAL METALLIC RECTIFIERS


2:570 more

'N.

withELEBatte y Ft t dtors

6/12 -volt DC Power Supply ...operates all 6 & 12 -volt auto radiosSame price range as Kits!

Heavy duty control transformer offersbetter regulation and withstands over-loads for long service. Electro appli-cation of larger selenium rectifiers,combined with EPL patented conductioncooling increases rectifier power ratingat lowest operating cost. Rugged, highquality construction, superiorfiltering, wide application. $3995

Only Electro offers actual proofwith performance charts

DC OutputVoltage

Ampera e Output % ACRippleContinuous Intermittent

0-8 0-10 20 50-16 0-10 20 5

Model ' NF" DC Power Supply0-28 volts up to 15 amperesLeas than 1% ripple at top load. Intermit-tent loads up to 25 amperes. Acclaimedin industry for its unmatched perform-ance and construction at thisprice. Certified performance. S1 9500

SEND TODAY FORDETAILED BULLETINS!

110-55

I- 1ELECTRO PRODUCTS LABORATORIES

I 4501-1 N. Rovenswood Ave , Chicago 40, III. IRush bulletin on

Electro "D-612" 0 Eledro Model "NF" I

IName

ICompany

IAddressC;ty Statea-

I

IrJ

Two -Way Radio Systems


radio technician; a license is re-quired only for servicing the trans-mitters.

There is no practical limit to theusefulness of a radio system of thistype, and their numbers are growingwith amazing speed. Even in thesmallest town, radio -equipped carsare a common sight today: a fewdays ago, I counted seven in thefour blocks of our small MainStreet! Their maintenance and in-stallation is a growing and profitablebusiness. It will be well worth thetechnician's time to obtain theneeded licenses and equipment, toget into this lucrative field.

Closed T -V in SchoolGov. Robert E. Smylie of Idaho

recently conducted a class in polit-ical science at Idaho State Collegewhich was witnessed simultaneouslyover TV by youngsters in 11 differ-ent Idaho elementary schools in thenation's first demonstration,of a com-pletely televised public school sys-tem.

Gov. Smylie and other state offi-cials participated in a panel discus-sion on state government. Also tele-vised was a fourth -grade readingand social studies class watched byfourth graders and student teachers.A third class involved a demonstra-tion on the use of radar in highwaysafety.

The closed-circuit educationalnetwork was financed jointly by Jer-rold lectronics Corp. of Philadelphiaand Bannock Cable TV, Inc., of Po-catello, Idaho. The two companieshad made a grant of $5000 to IdahoState College for the purpose of es-tablishing the chair of TV co-ordi-nator to head up the educationalnetwork.

The network, whose programsoriginate at the State College, is con-nected to an existing communityantenna system, so that educationalprograms can be watched by young-sters and parents right in their ownhomes.

The new network makes it pos-sible for a few specialized teachers,who formerly traveled from schoolto school, to reach a much largerstudent body by broadcasting fromthe college studio. Since only asingle film library, at the college, isnow necessary, money formerlyspent on duplicate films and equip-ment will be used instead to enlargethe single combined library.

"He does have a nose for goodrecords, but you must try a

JENSEN NEEDLE."

ask the"Man -on -the -Root''why .he prefers

eoviRbeivt,

COMBINATION STEEL ADJUSTABLEWALL BRACKET-Model 5T3 -18AAll steel construction; Hot -Dip galva-nized to prevent corrosion. 18"bracket featuring embossed steel brac-ing leg, is adjustable for vertical mastmounting under cave. 3" embossedsteel top bracket with "reversed" Ubolt and clamp permits use of Spintit.for nut tightening.

Write for 1956 Catalog

SOUTH RIVERMETAL PRODUCTS INC.

South River, New Jersey

pioneer rt.outslandio/producer offinest lineof antennamounts

70 Circle numbers on free ;nquiry card, p. 33, for more product data.TECHNICIAN March, 1956

Only the 5 TOP-QUALITY brands of

STANDARDBRAND TUBES

AT SENSIBLE PRICES!Individually boxed lot Reality only RTMA

guarantee No rebrands or rewashed bargainss Brand new No private brands Ns relents

For your FREE copy of our latest tubeprice list and handy Air Mail order form

CIRCLE No. 319on Reader Service card

on page 33

TYPE EACH TYPE EACH TYPE EACHOZ4 50 6AT6 55 707 115lAX2 1 00 6018 1.10 7117 85183GT .... .90 6AUIGT . .1.05 717 1 35MGT .... .80 6AU5GT ..1.25 707 .1.20

6AU6 70 7L7 1 15116 1 10 6AU7 90 717 9511.A4 100 6AV5GT ..1.25 707 1 001LA6 1 00 6AV6 55 787 1 301184 1 00 6AX4GT ... .85 797 1 30105 100 6AX5GT ... .75 797 .1.30106 1 00 684G 1 25 7X7 1001105 1 00 6836 65 7Y4 7011E3 100 6837 .90 724 701105 1 00 68C4 1 60 1234 851104 . . 1 00 6805 70 12AL5 .70105 1 no 680 1 25 12305 751115GT .95 6105 1 40 12A76 .55MGT .. 1 15 6806 75 12A77 .95114 1 00 68E6 70 12306 65115 85

oo6815 856816 70

1230712396

.. .80

. 5-155 70

so68060...1 806806 85

12AV712AW6

..1.00

..1.001T5GT :...1.05 68/6 85 12AX4GT .. .90104

701056805 1 006807A .. 1.10

123X712AY7

... .801.75

IV 95 6817GT ...1.15 12327 .. .901V2 70 6106 1 15 1284A1128 95 68060TA ..1.40 128362AF4A 1.40 6807A ....1.20 128A72021 100 6807GT ...1.25 12806212 50 61Y56 .. .1.30 128(6333 1 10 6827 . . .1.25334 55 6C4 . .50 12811711 ... .95335 75 6C5 080 128(5 _1.003AL5 65 6085 4 5 12806018 .1.403306 70 6C16 70 12817*, ... .953AV6 60 6CD6G .1.80 12827 ....1.003805 80 6016 90 1206 1.403006 1 05 6CG7 85 126A7GT .. .8538Y6 75 6C1.6 . .1.15 12507 .... .953016 80 6CM6 85 12617 .. .753CF6 85 6CO6 75 12507GT .. .753114 1 20 6CU6 1 40 126L7GT ..1.00304 85 6DC6 95 1261701A . .80305GT 1.00 615 .85 126076T .70364 80 80 12V6GT394 85 606 75

. .75128661 .90

4807A 1.30 614 3 95.

1434 1.004827 135 615 50 1435 1 5051118 1.05 616 70 1437 855AN8 1.10 617 95 14317 .. 1.005A(15 75 6K6GT.....70 1486 8-5AS8 1 10 607 .. .90 14C7 1005ATIF 1 10 608 125 14E6...1.205AY8 1 15 6166 1 35 14E7 1.30.3A1V4 1 15 6L6GA 1.30 1417 1.00.,A24 60 616N 175 1418 1.30516 93 617 1 20 1407 1.00514 1 75;114G 60

607 1 00 1487654 65 1407

1 00.95

4468 .70 668G 1.10 14117 .. 1.30308 . 1.10 6507 90 1467..1.255V4G 95 6015 .75 14W7 1.3555601 156E7 95 198060 2 00

540 836507 956607 95

1918 1 2025AV5GT

558 ...1.05 661711 .... .75..1.30

25AX4GT 1.105Y3GT .. .55 6617GT ... .75 25805 1.005140 65 661.70 ...1.00 25806618513 90 66117011/8 .80

.1.1025CD6GA . 1 80

514 1 25 6607GT ... .70 2506 ... 1.356A7 115 6617 75 251661GASH 1.15 6667 1 00

.7025W4GT

6A8GT 1.10 618 1.05... .75

2525 806A84 .65 608 1 05 252661 J56ACSGT .1.15 6538 130

.

3535 706AC7 .1.10 6V6GT ... .65 3585 706AD7G .1.55 6568 .....1.30 3505 706A14 1 30 6W4GT .... .70 351.661 ... .656AF6G .1.20 6W6GT .... .90 35W46AG5 75 6X4 .50

. .45

6AG7 1 35 6X5GT .55 3525 .456AN IGT .85 618 1 00

.

41 856AM IGT .85 6160 95

1.75 705 95 43 .856AK5 75 736 80 5035 106AK6 80 737 . 85 SOBS 706AL5 7A8 80 5005 706AL7GT .1.65 7AG7 1 00 501601 . .6,6A614 1.55 7307 100 50X6GTSARIS 1.15 784 80

,9050Y6GT .80

64114 1 50 785 70 50Y7GT .806AN5 350 786 .80 70L7GT ...1.356AN8 .1.20 787 . .80 80 .656305 70 788 90 11717GT 2.506306 60 7C5 80 11717GT 2.006A07GT ...1.20 7C6 80 117P7GT 2.006AR5 756355 .

7C7 857E7 1 20

11723 .. .

1172467 . 1.1570

6356 225 717 90 117260T ..1.156AS8 . .1.20 718 1 20 5642 1 00

You may Include In your order types not listed. Westock over 1000 types including Diodes, TransistorsTransmitting and Steele Purpose Me&

CASH PAID FOR EXCESS TUBE INVENTORIES!MUST BE NEW. BOXED 6 CLEAN. WRITE!

TERMS: 25% with order, balance C.O.D. Allmerchandise guaranteed. F.O.B., N.Y.C.

BARRY ELECTRONICS CORP.Dept. T

512 Broadway, N. Y. 12, M. Y.WAlker 5-7000

Color Instruments

(Continued from page 29)illustrated in Fig. 8 with that of Fig.9; although the waveform shouldappear the same in both cases, the3.58 -me chrominance component ispractically wiped out in the displayof Fig. 9. These illustrations serve toshow that a scope which may bequite satisfactory for alignmentwork, to display demodulated re-sponse curves, may be completelyunsuited for the display of colorsignals.

Also important in the response ofa scope for color -TV work is thetransient characteristic. When theoutput from the R -Y detector is ap-plied to the vertical -input terminals,and the output from the B -Y de-tector is applied to the horizontal -input terminals of the scope, a typ-ical vectorimeter pattern is obtained.The vectorimeter pattern normallyhas a hexagonal form; but if thescope has poor transient response,confusing displays such as shown inFig. 10 will be obtained. Of course,any scope can be successfully usedas a vectorimeter if the R -Y andB -Y outputs are taken from a high-level point in the receiver where thedeflection plates of the scope can bedriven directly, or if low-level signalis applied to the deflection platesthrough a separate wideband ampli-fier.

Fireproof TV

Guaranteed to stop consumer traffic is thisfiery display atop the metal cabinet con-taining the latest Westinghouse televisiorreceivers. Treated with a special chemicalfinish, the cabinet is doused with lighterfluid and a flame applied to it. Watchingthe demonstration are Joseph Rudnick, Sun-set Appliance Stores, New York, (left) andIra Kaplan, Times Appliance Co., Distributor.

te.

more new*correct

replacementflybacks

(Horizontal Output Transformers:

by TRIADIA0

B-72 Westinghouse°CorrectReplacement

s

fr,(.4

6W

7.64 List Price 510.50 Correct replacemnt forWells -Gardner Part 53x319, 63x3203-66 List Price $10.50. Correct replacem3n forSentinel Part 22E57, -2, -3, -5, -6, 22E61_ -3

0.68 List Price 513.00 Correct replacemem tarMotorola Part 24K721301, C, 24K7221260.72 List Price $10.75. Correct replaccernen -orWestinghouse Part V-11548-1, -2, -3043 List Price $9.75. Correct replacemen -orWestinghouse Part V-9904-1, 10213-1D-76 List Prize $9.75. Correct replacemen forGeneral Electric Part RTO 131, 141, 162-3

TRIAD *Correct Replacement fly3aeMs

are mecharically and electricallycorrect ruggedized versiols of

manufacturer's items - and whereqerpossible COMPOSITE REPLACEMENT

to fill a number of requirements wh3rmechan cal and electrical specif ca:ton's

are identical.

Write for catalog TV -1 `5K

ss f

RS01311 rTRANSFORMER CORP

4055 Redwood Ave. Venice, Calif.

TECHNICIAN March, 1956 Circle numbers on free inquiry card, p. 33, for more product Oat, 71

REPAIR and TEST

PICTURE TUBES"Right on the Job"

CENTURY'S CRT

TESTIVATOR

New Profits! More Sales! Saves Time

and Trouble!

With the 103 CETTESTIVATOR youcan repair picturetubes right in theset In a matter ofminutes. The TES -TI% I Itla tells you INSTANTLY what thetrou' Is and TIIEN FIXES IT!

IT TESTS: Cathode emission Shorts andleakage between elements

Open elements Probable useful life of the tube.IT REPAIRS: Activates the CET cathode

by removing surface contami-nation. Restores emission giving life toweak and dim tubes Clears Inter -elementshorts and leakage.So easy to use . . . you Just plug in. attach

the TESTIVATOR socket to the base of theCRT and the accurate, easy -to -read Indicatorstell you what you must know. (Complete cablesand instructions included.'

FREE BONUS: Order now and receive ahandy, valuable booklet list-ing, radio and TV tubes (incl. CRT) which canbe substituted with NO WIRING CHANGES.Another 0 'fitmaker for you.

10 -Day Free Trial-Money Back GuaranteedPAY AS YOU EARN..

CENTURY ELECTRONICS CO., Dept. T-31 1 1 Roosevelt Ave., Mineola, N.Y.C1 Enclosed is $5.00 down payment. Please sendme Model 103 CRT TESTIVATOR.After 10 days. if not completely satisfied. Iwill return it for a complete refund-Or Iwill send 85.00 a month until the full priceof $14.95 plus postage is paid.

Name

AddressCity State0 SAVE SHIPPING CHARGES! Enclose $14.95with this order . . . then we pay the ship-ping costs. Same refund privileges.

HUSHR q U S Pot. OR

Chemically engineeredfor tuners and switching

mechanism1111.

tient& MIN.t.s 4

15sz.Spesyem

$2.25est

Hush comes in a 6 oz.Pressure can with suffi-cient pressure to reach allcontacts to wash -awaythat dirt, leaving cleanand positive contacts, pro-tected with a lasting lu-bricant film. Hush doesnot affect inductance. ca-pacitance or resistance.

Hush also available in 2oz., 8 oz. and 32 oz. con-tainers.

Free literature available.Use special inquiry card.

Soo your distributoror writ. to

CHEMICAL ELECTRONIC

ENGINEERING, INC.

Matawan, N. J.

Tough Dogs

(Continued front page 41)

showed that all the pulses werethere, and that they were of correctamplitude and shape. The centerpoint of the afc circuit was about 2volts positive, but it was assumedthat this voltage had been developeddue to the difference in frequencybetween the oscillator and the in-coming sync pulse. After some fur-ther probing failed to produce re-sults, this point in the afc circuitwas checked again-this time withthe 6AL5 out of the circuit. The 2volts positive was still there!

This was it, I thought. The onlyplace the voltage could come fromwas leakage of the 0.1-mfd capacitorcoupling the reference horizontalpulse to the phase detector. A new0.1-and still no dice. The 2 voltswas still there. The only things leftin the circuit were two solid -looking150 k resistors that were feeding thereference pulse to the 6AL5. Theychecked on the money with theohmmeter but, when they were outof the circuit, the 2 volts disap-peared! When they were changed,the set popped into sync.

Later on, intrigued by the mys-tery of the two resistors, I set outto learn how they produced the 2volts. I discovered that they hadturned into little rectifiers, appar-ently by setting up a layer of copperoxide at the point where the carbonof the resistor body met the lead.The effect was so slight that the re-sistors measured substantially thesame in both directions on the ohm-meter. However, by applying volt-ages to duplicate the operating con-ditions found in the set, the resistorscould be made to act as rectifiersoutside the receiver circuit.-EdTownsend, Worth, Ill.

Since1933

Yokes

Flybacks

Transformer

oQ

authentic71.1ep (teenier -its

for Televisionall

leading makes and models

AUTHENTIC REPLACEMENT IS Always Right Easier to install Cuts service time Increases service profits

SERVICEMEN!Write Dept. IT forservice hints. Whatare your problems?

QualityControlled

dTODD-TR AN CORP.MOUNT VERNON, NEW YORK

F.C.C. LICENSEQUICKLY!

Correspondence or Residence Proparationfor FCC Examinations. Results Guaranteed.Our specialty is preparing you to pass FCC

licence examinations. Beginners get 2nd class li-cense in 8 weeks, 1st class in 4 additional weeks.Students with background often finish morerapidly.

Here's p Too 1 !A few of our recent graduates,the class of license they got,and how long it took them:

Class ofLicense Weeks

Irvin Gemora, 5008 Pembridge, Baltimore 1stW. C. Goodall, 500 Forest BI., Indianapolis 1stDick Johnson, 1756 P St., NM., Washington 1stRobert LaVoy, 2,I7 Rochelle Rd., Toledo, 0 1stJohn Marquez, RFD 1, Hummelstown, Pa 1stP. Martinez, 1013 N. Alvarado, Los Angeles 1stJa4,$anders, 118 Nagle, Harrisburg, Pa 1stBrenFShriver, 158 E. 136, Hawthrone, Cal 2ndJ. Yeardley, 500 Lynn P1., Falls Church, Va...1st

Learn by Mail or in Residence

Correspondence training from Washington, D. C.DAY and EVENING resident classes held inHollywood, Calif., and Washington, D. C. Enterany cow..e you choose.

OUR GUARANTEEIf you should fell the FCCexa, after finishing ourcou.,e, we guarantee togiv . you additional train-ing at NO ADDITIONALCOST. Read details in ourfree booklet.

Write for our free booklet, telling how youcan get your commercial FCC license quickly.There is no obligation and no salesman will call.

8109

11141311

13

FCC -TYPE EXAMSFCC -type tests ere usedthroughout the Granthamcourse. Constant practicewith these FCC -type testshelps you prepare for theactual FCC examination.

Grantham School, Desk 7821 19th Street, N.W. OR 5910 S Blvd.Washington, D. C. Hollywood 28, Calif.

7:1 C cn f-ue inquiry cord, p. 33, for more product data.TECHNICIAN March, 1956

They StillBUY

Diamond, Jewel, and Precious -Metal Tipped

PHONOGRAPHNEEDLES

PERMO, .SistcoefrnetkelCHICAGO 26,

VIDEOPROBE

METER!a professional instrumentdesigned for testing a T.V.

ABOVE and BELOWchassis!

THE VIDEOPROBE METER!

Saves TWO HOURS PERDAY when used in shop for

under chassis work.

With the attachable pick-up loop. (where sufficientsignal is available) the Probe Meter can detectand indicate radiation of signal thru LF. unitvideo amp tubes. (Simply slide loop over tubabeing tented.) Where internally shielded tubesare encountered, remove tube and insert probe tipinto grid pin of socket. Indicates gain per stage.

DealersNet Price

$31.50Can accurately trace signals in the following TA%circults--(from tuner to pig tube) R.F.. I.F., Det.;,Video. Sync., local osc.. Hz. osc.. Hz. Drive. audio'out"..' and I F ,Steno) tracing radios.)

RA FOR TRACING AND COMPARINGCOLOR T.V. CIRCUITS.

ADDITIONAL FEATURESVoltmeter, 0.500V. D.C.. 20.000 Ohms/volt.

Fully GuaranteedIf your dealer cannot apply You. order dime':till purcitni..e price refunile.1 if not sat iyned.DEALI it, b Itl I\ QUIP!! S WILL ItE( LIVE

I \I MI PI A'l F. A'I' t.NYIt)N.

Research Inventions & Manufacturing Co.617 F St., N. W., Washington 1, D. C.

Circle numbers on free inquiry card, p. 33, for more


ADVERTISERS INDEX

MARCH 1956

Barry Electronics Corp. 71Blonder -Tongue Laboratories, Inc. 57

Caldwell -Clements, Inc. 64CBS-Hytron, Div. of Columbia Broadcast-

ing System, Inc. 11Centralab, A Div. of Globe -Union, Inc. 51, 53Century Electronics Co. 72Channel Master Corp. 6, 7Chemical Electronic Engineering, Inc. ... 72Cleveland Ins'ilute of Radio Electronics . 61Cornell-Dubilier Electric Corp. 12, 69

DuMont Laboratories, Inc., Allen B. ... 8

Electro Products Laboratories 70Erie Restistor Corporation 65

Federated Television Mart 73

General Dry Batteries, Inc. 52Grantham School of Electronics 72

Heath Company 65Hickok Electrical Instrument Co., The 54

International Rectifier Corp. 69International Resistance Co. Cover 2

Jensen Industries, Inc. 72Jones & Laughlin Steel Corp. 18

Kenwood Engineering Co., Inc. 73Koster Solder Company 67

Littelfuse, Inc. 74

Mallory & Co., Inc., P. R. ..... 20, 21McGraw-Hill Book Co., Inc. 64Merit Coil 8 Transformer Co. 68Microtran, Div. of Crest Labs 68Motorola, Inc. 9

Oxford Electric Corp. 60

Permo, Inc. 73Pyramid Electric Company 49

Quam-Nichols Company 58

Radiart Corp., The 12Radio Corp. of America 15, 19, 55 Cover 4Radio Merchandise Sales, Inc. 67Raytheon Manufacturing Co. 2, 3Research Inventions & Manufacturing .. 73Rider Publications 4

Sarkes Targian, Inc., Rectifier Div. 56Sel-Son Electronic Tube Corp. 59Simpson Electric Co. 10Snyder Manufacturing Co. 22South River Metal Products Co., Inc. 72Sprague Products Co. Cover 3Sylvania Electric Products Inc. 13

Technical Appliance Corporation 16Thompson Products, Inc. 5Todd-Tran Corp. 72Tung -Sol E ectric, Inc. 62, 63

Vokar Corp. 66

Wen Products, Inc. 14Westinghouse Electric Corp. 17

While every precaution is taken to insureaccuracy, we cannot guarantee against thepossibility of an occasional change or omis-sion in the preparation of this index.

product data.

Only TOP-QUALITY brands of sIEFSTANDARD

BRAND TUBESNEW

YEAR GUARANTEE. EVeVuttf::,rsi".:rejects, no rebrands or rewashed bargains.

Name Brand6AF4A .98

Replaces 6A F4

WHILE THEY LAST!6517 59e 6SL7 63e6AK5 49 6S57 666AC7 59 6V6GT 566A67 49 12AT7 796AL5 45 12SH7 6212BH7 72 6AU6 5;12AX 7 72

Act Fast-WHILE THEY LAST!FILTER CONDENSERS

.Tresh,n

Fresh

250 mid-150V)120 mid -150V, Per-) 7 C50 mfd- 25V) Packs

20 mid- 25Vr paper20 mid- 25V) Packs

140 mid -300V ik Fresh200 mid -150V5 mfd-300V

30 mid-150V)

100 mfd-300V) Fresh200 mid -200V Paper39 I

40 mfd-2000 Packs

80 mid -300V 1 F,h40 mfd-250V papn3c

100 mid- 50V( pacc.10 mid -450V)

120 mid -150V)

Pd'

pFreshr29TFVOR SLEACT. EST ) a s

c

40 mid -350V Fresh

40 mfd-350VI Paser39e1:iffdd--335500Vv), Packs

228

40 mid -450V40 mid -450V1 CAP lc80 mid- 25V)

GOV'T SURPLUS 6AG5 . . . . 51e

NAME BRAND SELENIUM RECTIFIER

350111A 990 I 500M A 51.1.No Order Too Small. Merchandise shipped witnin 24hours it receipt al order. 25"o deposit repair d vet)order. F.0 B. Brooklyn.

FEDERATED TELEVISIONMART, INCORPORATED

513 Rogers Ave., Dept. T, Brooklyn N. Y.

KENCO KATE SAYS

INSTALLATIONPROBLEMSwhen you useK ENCOMOUNTS''

KENCO6"

12"Aluminum Snap -In

Wall BracketsMade of heavy gauge high

strength aluminum alloy. Snap -o feature eliminates holding ofeast while applying hardware.::arriage bolts throughout formay installation. Full threadlex head lag screws permit use3f ratchet or speed wrench.

Available with Stateless SteelHardware (optional at slight extra:ost).

For information on the com-plete Kenco line write Dept. ES.

(94 pages in this issue includin3 Circuit Diga.:li) Y3

Inventors of the electronic fuse, Littelfusehas pioneered every major developmentin standards of electronic circuitprotection. Littelfuse has also createdand produced in its more than 28 years

laterally thousands of special and complex electronicitems. Littelfuse engineering advice is always availableon special or standard applications for autcrro'-ive,aircraft or electronic circuit protection.

LITTELFUSE

Sprague Salutesthe I dependent..Service Dealer

nn

Ask your distributor

for big, window -size

blow-ups of this ad.

or write directly to

Sprague Products Co..

North Adams, Mass.,

on your letterhead.

HERE'S TO THE MAN

... who assures your enjoyment of the bestentertainment in the land.

... who competently and conscientiouslykeeps your TV and radio in top operatingcondition.

... who has become a specialist in his chosenfield like your doctor, lawyer, or dentist.

... who has the finest service equipment tooperate his own business in your homecommunity.

... who stands alone ... serving no other bossthan you, the customer.

... who has earned your patronage, respect,and confidence as an important asset tothe community he serves.

YOU CAN DEPEND ON THIS MAN

SPRAGUE WORLD'S LARGEST MANUFACTURER OF ELECTRONIC COMPONENTS

"BACKGROUND QUIETNESS". . . for new "front-end" performance;

A MAJOR ENGINEERING FEATURE OF RCA RECEIVING TUBESKnown for their ability to hold tube noise to surprisingly low levels-andproduce a cleaner TV picture for the customer-RCA Receiving Tubes aremaking even more friends with servicemen the country over.Take a few of the improvements that contribute to background quietnessin the famous "front-end" tube-the RCA=6BQ7A; Gold-plated gridsreduce reverse grid current; extra heater-to -cathode insulation lowers leakagecurrent and reduces hum; larger grid and cathode connectors minimize "induced'grid noise.... features that can give new "front-end" performance!

For increased "background quietness" and a cleaner picture, always replacewith RCA Receiving Tubes-and say goodbye to costly callbacks.

RECEIVING TUBESRADIO CORPORATION OF AMERICA