Circuit Digests - americanradiohistory.comH. A. REED, V.P. & General Sales Manager LEE GRAVES, Eastern Sales Manager CHARLES S. ROEVER, District Manager ... For a detailed description

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CIANCircuit Digests

pERFOR

TUNING

BRIGHTNESSr/

CONTRAST

INTERFERENCE

LINEARITY

A ANmENT

SOUND

CIARITy

ONLY IRC GUARANTEES

SATISFACTORY MECHANICAL FIT

AND ELECTRICAL OPERATION

o DOUBLE -YOUR -MONEY -BACK

The typical manufacturer's specificationsshown here are exactly duplicated byIRC Q.1-180 control. CONCENTRIKITassembly includes P1-229 and R1-312shafts with B11-137 and B18 -132XBase Elements, and 76-2 Switch.

Wiwwfrovtk CAnatit Sof- -vvv-

IRC EXACT DUPLICATES

ARE DOUBLE -MONEY -BACK

UARANTEED

The mechanical accuracy of IRC Exact DuplicateControls or universal CONCENTRIKIT equivalentsis based on set manufacturers' procurement prints.Specifications on those prints are closely followed.

Shaft lengths are never less than the set manufacturer'snominal length-never more than longer.

Shaft ends are precisely tooled for solid fit.

Inner shaft protrusion is accurately duplicatedfor perfect knob fit.

Alterations are never needed.

For Exact Duplicate Controls, specify IRC.Most Service Technicians do.

INTERNATIONAL RESISTANCE CO.Dept. 571, 401 N. Broad Street, Philadelphia 8, Pa.In Canada: International Resistance Co., Ltd., Toronto, Licensee

TECHNICIANe. Circuit Digests

TELEVISION ELECTRONIC

M. CLEMENTS 0. H. CALDWELLPublisher Editorial Consultant

SIDNEY C. SILVER, Managing Editor

CREIGHTON M. MARCOTT, Assistant Editor

ANN O'ROURKE, Assistant Editor

ALBERT J. FORMAN, Consulting Editor

J. L. STOUTENBURGH, Consulting Editor

DR. A. F. MURRAY, Contributing Editor

CHARLES F. DREYER, Art Director

ELMER KETTERER, Circuit -Digest Production

GEORGE PUGLICI, Circuit Diagrams

BUSINESS- DEPARTMENT

H. A. REED, V.P. & General Sales ManagerLEE GRAVES, Eastern Sales Manager

CHARLES S. ROEVER, District Manager

P. 1. CARNESE, Sales Promotion Manager

N. McALLISTER, Asst. Business Manager

CAROL YOUNG, Production ManagerKATHLEEN CAFARO, Reader Service

A. H. POND, ControllerW. W. SWIGERT, Credit Manager

ELMER DALTON, Circulation Manager

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

Telephone PLaza 9-7880

S. M. GASKINS, V.P. & Western ManagerJOHN D. LUPTON, District Manager

R. E. SCHULTZ, District Manager201 N. Wells St., Chicago 6, III.

Telephone RAndolph 6-9225

CHRIS DUNKLE & ASSOCIATESCalifornia Representative

3257 W. 6th Street, Los Angeles 5, Calif.Telephone DUnkirk 7-6149

1651 Market Street, San Francisco 3Telephone UNderhill 3.5282

TECHNICIAN & CIRCUIT DIGESTS* March1955. Vol. 61. No. 3. 5.50 a copy. Publishedmonthly by Caldwell -Clements Inc., PublicationOffice, Emmett St., Bristol. Conn. Editorial, Ad-vertising and Executive offices. 480 LexingtonAve., New York 17. N. Y. Entered as secondclass matter at the Post Office at Bristol, Conn.June 10. 1954. M. Clements. President; M. H.Newton, Assistant to President; John J. Borghl,Vice President and Treasurer; M. B. Clements.Secretary. Subscription rates: United States andCanada. $4.00 for one year; $6.00 for twoyears; $8.00 for three years. Pan-American andforeign countries; $7.00 for one year; $10.00for two years; $14.00 for three years. Printedin U.S.A.

RADIO AUDIO SERVICE

MARCH, 1955

FRONT COVER: Three -step prog-am serves as c worthsvhile reminder that it's good businessto encourage your customers to have you keep their TV receivers in top operating condition.Promote the TUBE -UP, TUNE-UP, CHECK-UP campaign ii conjunction with manufacturers' na-tional programs. For a detailed description of what the tube makers are making available toyou-selling aids, contests, ads, mailers, posters, etc.-see article starting on page 20.

It finally Happened; While We're on the Subject; SergeantFriday Nabs Tech

"Tuning in the Picture"Simplified Color Demodulation Circuits Peter Orne

Radio -TV Rectifier and Power Supply Circuits chael Craig

Tune Up Your Sales PitchShop HintsAdding Extra Speakers M. G. Goldberg

13

14

16

18

20

23

"Tough Dog" Corner R. Eldridge, F. Fetrow, J. L. Mancini 24

What's New in TV Tuners? R S Lewis 25

Maurice Michaels 26

Lead Dress Troubles Cyrus Glickstein 27

Transistor Service Tips Joseph Amorose 29

First TV Receiver With Wings 29

New Audio Equipment 34

Antennas & Related Items 36

Speeding Up Soldering 44

RCA's Music Synthesizer 45

New Midget Multimeter 53

Electronic Cooling Pioneer Development 54

Tape Recording Glossary-Supersimplified 54

GE Sponsors "TV Service Month" :75

Horizontal Circuit TroublesCircuit Digests Cumulative Index 62

Circuit Digests 65

CAPEHART-FARNSWORTH: Chassis "CX-38" series RATHEON: Chassis Aristocrat seriesGENERAL ELECTRIC: Chassis "N" line WESTINGHOUSE: Chassis V-2315

MOTOROLA: Chess s T5-525 STANDARD COIL: Model "T" series

DEPARTMENTS

Letters to the Editor 6 New Books 47

Calenda of Coming Events 15 Service Association Reports 48

New Prcducts 3) News of the Industry 50

Catalogs & Bulletins 45 Reps S Distributors 59

CALDWELL-CLEMEN I'S, INC.Publication Office. Bristol, Conn

Editorial/Business Offices 480 Lexington Ave., New York 17, N. Y., Tel. Plaza 9-7800Publishers also of MART and TELE-TECH & ELECTRONIC INDUSTRIES

Copyright byCaldwell -Clements, Inc.. 1955

Reg. U. S. Potent Office

ANNOUNCING

MODEL

* Dictionary: the highestdegree of accuracy in thereproduction of a signal

'We will stake

out reputation

on this!'

M. L. Finneburgh, Vice -PresidentThe Finney Company

speaking for the entireFINCO organization:

"The newth

Finco Model F-4 (pat. pend.)is

e closest approachto perfectid in TV antenn

on yet con -as. The F-4 gives tbined hegreatest

comachieved

in thperformance

everboth Lo

e Super FringeArea .. on

stake our reputati Upon this, weon. "

SENSATIONAL LOW PRICEFIDELITY PHASINGLOW AND HIGH -BAND SUPREMACYENGINEERED FOR COLORUNCONDITIONAL WRITTEN WARRANTYFREE TESTING ANTENNA TO QUALIFYING DISTRIBUTORS

WRITE, WIREOR PHONE

TODAY!The FINNEY Company

1-35

4612 St. Clair AvenueCleveland 3, Onio

RADIO CNEMICAI lAtORATOPFMA pai g no co in II to) nu

H 1 1

G -C RADIO TELEVISION CHEMICAL LABSave time and money, with this complete lab of 20 2 oz. G -Cchemicals. Do all repairs to speakers, coils. dials, etc. Free metalrack includedNO. 997 NET 57.65

G -C SCRATCH REMOVERDark shade covers hairlinescratches, renews appearanceof TV set, furniture.NO. 92-7 7 nz tirdtle NET SO 30

G -C WOOD CABINET GLUERepair IV and radio cabinets.furniture, etc. Fasten grillcloth, labels.NO. 39-2 2 -oz bottle NET SO 39

G -C MIKE CONNECTORSingle contact male type.completely shielded. Brass.bright chrome plated.NO. 7910 NET S030

FAHNESTOCK CLIPSSpring brass. long x srry-

wide. No. 6 mtg. hole. Boxof 144. Medium Size.NO. 6312-G NET 57.46

G -C PIN STRAIGHTENERStraightens both miniatureand jumbo -miniature tubesof both 7- and 9 -pin types.

NO. 1655 NET S1.50

No 0*

41116D -

C.&

G -C ROOF-SEEL COMPOUNDSeal holes in roofs on roof -topantenna installations. Stopcall-backs.NO. 18.16 Pint can NET SO 60

alb

GC LENS -TUBE CLEANERSpecially prepared to removefinger marks and spots onpicture tube and lens.

NO 216.77-01 bottle NET TO 36

4111.11,

G -C DE -OX -IDCleans and prevents oxidationon all sensitive circuit con-tacts, switches. etc.NO 19-7 7 of bottle NET SO 96

C -C DELUXE F EL T- KOAT KIT G -C DIAL CORD DRESSING G -C RADIO KNOB KIT G -C KNOB SPRING KITComplete flock finishing kit Prevents dial cord slipping. Kit contains 35 assorted wal- Kit of 100 knob springs in 1:'for applying to turntables. Simply rub dressing stock on nut and ivory replacement different styles. Temperedgrilles. cabinets etc cord. Long lasting. knobs. Includes springs. spring steel.NO 180 0 NET 52.25 NO. 1111 NET S0.15 NO. 1110. NET $2.12 NO. 1051 NET 51.17

GENERAL

CEMENT

(r'G -C PHONO PLUG

Phono connector for RCA.Philco. Zenith and others. Usealso for auto radio.NO. 1742 NET 50.06

G -C BANANA JACKStandard jack, insulatedhead. Mounts in 5,i6 hole.NO. 7741 Color Red NET SO 132NO.7742 Color Black NET 50 .132

G -C LIGHTNING ARRESTORUnderwriters' approved. forall types of UHF -VHF leadlines. Easy to use.NO. 8642 NET $0 /5

74.4 701 7eedeRADIO -TV

SERVICE AIDSefreet Poggeir

G -C STD. TERMINAL STRIPSBakelite insulation r i6" thick3," spacing. five lugs. othersI to 12.NO.1785 NET SO 071

G -C POCKET WIRE STRIPPERPopular wire stripper is alsoscraper. cutter, screwdriverand wire winderNO. 151 NET 50.30

G -C TV ALIGNMENT KIT G -C HANDLE INSULATOR;Handy versatile alignment Envelope of assorted sites totool kit in plastic holder. insulate handles on pliers.Four basic tools cutters etc. Neat appearingNO 8457 NET S1.77 NO 81184 NET SO 21

G -C 300.OHM CONNECTORScrew -type connector to splice300 -ohm twin line. Retainswire characteristics.NO.11095-E Env. of 2 NET SO 71

ASK YOUR JOBBER-

I - 4 7'

1

FOR THEI

G -C H. 0. POWER SWITCHD.P.S.T. toggle switch. Rated12 amp. at 125 volts. Formotors. appliances, etc.NO. 1350 NET 51.31

G -C

C -C "KLEER (ENS" I G -C 3 -WAY TV LINE KLIP I G -C UNIV UHF -VHF I "MITT -1" ADJUSTABLE ILENS CLEANER NO. 9015 NET 50.12 LIGHTNING ARRESTOR UHF -VHF ANTENNA

SPECIALS OF THE MONTH NO. 9011 NET SO./51 j20.11642 NET S0.75 NO. A-9098 NET 52.15 i

G -C STATIC SPRINGEliminates auto front wheelstatic noise. Riveted metalpoints for firm contact.NO.1058 NET 50.01

G C 6 -PIECE "St IP ON SETFriction handle hold., 'datedhex sockets. Sizes. '

NO. 115 NET $1.35

lam'.,

1955

,4Itera.API/494/.()

G -C INSULATION ANDDIPPING VARNISH

1 reat held coils, chokes, noisyor buzzing transformers.NO 56-1 2 or bottle NETSO 39

G -C TURNTABLE SPRING KITKit of 50 assorted turntablesprings for replacement onRCA, Philco. Zenith etc.NO WEI NET S1.65

G -C RADIO -TV SPAGHETTIBest grade varnished tubingin 2011. lengths. Fit No. 12 -No. IR wire. Five colors.NO. 199 NET 51.11

G -C AUTO RADIO TUNERHandy tuner tool for adjust-ing auto radio when chassisand cables are removed.NO. 8185 NET 51.27

G -C INSPECTION LIGHTService light where you wantIt. Ideal for production in-spection. 110 v. AC -DC.NO. /05 NET $1.35

FREE!

Send postcard for yourillustrated G -C Catalog.

GENERAL CEMENT

MFG. CO.902 Taylor Avenue Rockford, Illinois

DELCO RADIO'S Model 8007A Terrific Value at Moderate Cost

DELCORADIO

A GENERAL MOTORS PRODUCT A UNITED MOTORS LINE

DISTRIBUTED BY ELECTRONICS WHOLESALERS EVERYWHERE

0

i

greet

Dy De

is terrific...

03 REC

S DeE

10

er

MODEL 8007-The Speaker with Thousands of Replacement Applications!

Here is a sensational performer in the big Delco Radio lineof speakers . . . a replacement speaker for AM, FM,and TV receivers and phonographs that matches their servicerequirements with a voice coil impedance of 4.1 ohms-not toohigh. not too low, but just right! And it's ideal, too, for custom-built high-fidelity systems. Wherever installed, the model 8007Delco Hi-Fi speaker will give new sparkle and life over thefull tonal range.

Here are some of the reasons why:

Its 8 -inch curvilinear cone extends the Highs, gives maximum perform-ance over a range of 50 to 12,500 cycles per second A heavy Alnico -5magnet provides peak damping action, high output with clean performance,light highs, heavy lows l'ower rating of 10 watts Input impedanceof 4.1 ohms. A 1% -inch voice coil for excellent damping effect, higheflicienc. minimum distortion Total these features, add a rugged, zinc -plated, attractively painted basket, and you have the outstanding speakerin its price range . .. the l)elco model 8007!

The Most Highs . . . the Most Lows . . . the Most Watts ...in a Medium -Priced Speaker

!DELCO RADIODIVISION OF GENERAL MOTORS, KOKOMO, INDIANA

TECHNICIAN M- rch, 1955 5

"WV kaar3E" Nam es las ?

(atm Acifitakuni Autultumitmetp2A4)

*Use the Sarkes Tarzian CC -1. Plug -In Conversion Chassis to' modernize old TV sets.

All Sarkes Tarzian Replacement Rectifiers pluginto Conversion Chassis CC1. See your distributor.

&arkesTarzian

3E*1.-am. X mi."SELENIUM RECTIFIERS

LETTERSTo the Editors

Co-op Parts BuyingEDITORS, TECHNICIAN:

As the champion of the small andlarge TV operator technician, I believeyou could get a little more steam be-hind the elimination of so-called whole-saling of supplies to anyone with themoney to buy. What are the possibilitiesof legitimate retail -service operatorsforming a cooperative system of pur-chasing at the manufacturer level?This would put retailing on a bona fidebasis.

So long as the so-called wholesaler ispermitted to sell direct to the consumer(ham, student, or what have you), thepresent distribution system is a joke.The only way that technician -retailerscan possibly compete is by buying at thesame price as the jobber. Perhaps if thepresent jobber system could be hit inthe breadbasket with a cooperativescheme such as this, they mighthonestly decide to clean house.

0. N. TridpsoNsCampbell, Calif.

NATESA, MINTSE, LicensingEDITORS, TECHNICIAN:

Much as I like TECHNICIAN maga-zine, I believe I must question twoitems that appeared in the January '55issue on Page 19 (Licensing and Ac-creditation). The first is the quote onthe MINTSE set-up. MINTSE is notnow an affiliate of NATESA . . . Un-fortunately, unauthorized releases weremade on NATESA letterheads. MINTSEhas accepted the NATESA occupationalstandards. We are assuming a wait -and -see attitude toward MINTSE.

The second item is the quote at-tributed to TISA, our Illinois affiliate. . . it appears to have a meaning quitedifferent from our intention. AlthoughI am president of both TISA andNATESA, the attitude toward licensingof both is not necessarily the same.Both feel accreditation is vitally needed.NATESA feels licensing, whatever itsform, is a local matter. TISA has beenanti and pro licensing, depending on thenature of the bill. At present, TISAfeels we must seek outside help to dothe industry's own job of protecting thepublic and the honest operators.

FRANK J. MOCK, Pres.NATESA

Chicago, Ill.

As for MINTSE, the impression con-cerning NATESA membership was ob-tained from MINTSE releases, as thewriter points out. Concerning the re-marks attributed to TISA in January,these were accurate quotes, with nodistortion of context from the TISAreply to our questions on licensing. Thereply, however, was made by RubinSaxner, TISA secretary, and repre-sented his own opinion rather than thatof the organization as a whole. We failedto note the latter qualification.-Ed.

6 TECHNICIAN March, 1955

NO SUOWICSNO OPEN CUICIAIS

NO 00SE MOVNIS

'NO EXCESSIVEGAS

MI I

NO OTEETECTIVEGLASS

MN I

IL

NO BAD SEALS

11111111111111

uG

WHY WESTINGHOUSE "PRE -SHIP" TEST

ELIMINATES THESE CALL-BACK CAUSESIt here should jowl reAting of receiving tube.% takeplace? Not in the plant where they're made - not ifthey're going to be shipped any distance to a ware-house. Tubes can and do become defective in transitbecause of excessive and improper handling.How about testing at the warehouse? Right! By testingat the warehouse, you eliminate from shipment thosetubes that have become defective in transit, tubes thatcause you call-back trouble. Westinghouse, therefore,gives tubes a final "pre -ship" test at its field warehouses.

And this testing isn't done months before your orderis shipped. Just before Westinghouse ships tubes toyour Westinghouse distributor, they are "pre -ship"

YOU CAN BE SURE ...lc ITS

Westinghouse

tested to make sure that every one will I unction prop-erly, operate efficiently.In effect, your tubes are tested by Westinghouse, one -by -one, just days before they reach your stock. Thisextra Westinghouse precaution against call-backs willsave you money and time every month.Why put up with call-back complaints and extra han-dling of rejected defectives? You don't have to! Pro-vided you stock and use Westinghouse receiving tubes.Because the Westinghouse "pre -ship" test policy virtu-ally eliminates those irritating field failures. Call-backs cost you hard cash. Don't let them rob you ofany more profit. See your Westinghouse distributorand stock up on Westinghouse receiving tubes-thetubes "pre -ship" tested to guarantee dependability andtop performance.

ET -95064

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

TECHNICIAN March, 1955

the fabulous VHF -UHF antenna thiractallPsells itself with performance!

1 1 It IWhat do America's servicemen think of Channel Master's

RAINBOW antenna? Here are their very wordst:"The RAINBOW brings metropolitan recep-tion to isolated areas."

"Gets more stations in this fringe areathan any other antenna made."

"Just what our customers have been wait-ing for -- a powerful, sturdy, economicalantenna."

;lust a few, of the many letters of praise we receive dolly.

LOOK at the RAINBOW'S unique design, so deceptively simple,yet so unbelievably efficient. LOOK at its advanced features: NewSpacing Formula, new Triple -Section High Band elements, new full -efficiency Intermix Design, and the brilliant triple -power TRI-POLE!LOOK at its remarkable Yagi performance on every channel, itssharp single lobe. LOOK at its rugged, durable 100% aluminumconstruction, reinforced at all stress points. LOOK at its trigger -fast"Snap -Lock" Action, Channel Master's fabulous preassembly thatsnaps open, locks open, without hardware or tighten'ng.

With every installation, Channel Master's RAINBOW againproves itself the most powerful TV antenna yet developed bymodern science. Bay for bay, it out -performs every all -channelantenna on the market today!

Get In On This High -Powered Advertising DealYour Channel Master distributor offers you a hard-hitting promo-

tion program which includes TV spot films, newspaper mat ads,radio ads, full -color display material, and consumer literature.Advertise and install America's best known, most wanted antenna.

Here's how the RAINBOW out-aerforms the famous Champion:

0 oGee Q7!DS N 011 N N1.1q -Chemise

Coin Ower Air!$1.1ted

(bony.. -

3.5 I 4. 1.5 3.DI DS OS N N; 011

1.". 1 1.s .2.srlie0"Ih W MI N N N

'-.4"NW.

.3.5N

3.5 .3 2

N.15.2N es

3.5N

.4.N

PorbvillSUPI

111101,1 DI.2.3 3 t+3N NI N .4

es..sse N

.2N

2.5se

N.N

There's a RAINBOW model for every area . . .

for every purse!For fringe and super -fringe areas:

Super RAINBOW model no. 331, 53750 liststocked Super RAINBOW model no. 331-2, $7570 list

For suburban and near -fringe areas:ChampionRAiNBow model no. 330, 52360 liststacked Champion RAINBOW model no. 330-2, $486e list

For economy installations:(featuring butted tubing)

Challenger RAINBOW model no. 332, Si 8116 liststocked Challenger RAINBOW model no 332-2, $3750 list

horizontalpolar pattern

(relativevoltage)

PK.

NW

11

kid oe!NOTHINGout performs

CHANNEL

MASTER

ExclusiveDesignDelivers

Triple-Picture

Power!

model no. 331

',wont Pis 7 6913)0p.....,.

model no. 330-2332-2

A

a major step forward

in installation procedures -CHANNEL

SELECTENNAMASTERS

FREE TECHNICAL

ADVISORY SERVICE

Our engineers willtell you the correcthook-up for your area.Merely list the chan-nels you expect to re-ceive, as well as thedifferent antennas youwould like to hookup. No charge orobligation_

coupling system

the great Channel Master development

that permits unlimited antenna combinations

with only one transmission line to the set!

the NEW WAY, the BEST WAY,the on'y AUTOMATIC WAY to get

."'",all -channel, all -direction reception ...1 Without rotators!)

SelecTenna means: no extra cont-ol unit onthe set; no moving parts to get out of order;antennas are always in perfect orier,tation.

Without switches!SelecTenna means: no manual switches to

bother with; better performance because cou-plers have less insertion loss than switches.

Without multiple lead-in wires!SelecTenna means. neater, mo e profes-

sional installations, because no complicatedwiring enters the home. Only one lead connectsto the set.

This modern way to obtain multi -directionalreception - with its individual band _ passfilter networks - offers the consumer great:onvenience advantages possible in no othersystem. There's never been anything like it!The SelecTenna System is rapidly rep acing allolder methods. Use it on your next "multi -direction" installation!

Simple as:

Simply select yourchannel on the set--. list price:the right signal is $542always there E each

Including mountinghardware andconnecting wire.

CHANNEL MASTER CORP. !LUNY:1M N.

The World's Largest Manufacturer of Television Antennas and Acce;sorlas.

Copyright rit54. Chaanol Mosier Corp.

Couplers snap

together.

This particular

interlocked !tack

consists of

four Antenna

Couplers and

one Hi -Lo Coupler,

for joining twoHigh Band cnd

two Low Bard

antennas.

No lel CRA-1 58295us t1- rice

This fine double duty instrument pro-vides you not only with the completesetup for checking and analyzing alltypes of capacitors and resistors, butalso the "Quick Check" feature en-ables you to test capacitors whilethey are wired in a set.

With the Pyramid analyzer there is noneed to remove capacitors from thecircuit to determine if they are open,shorted or intermittent.

This new development that savestime in servicing and production test-ing serves the function that requiredtwo instruments previously, actuallycosts less than the older type analyzerplus a separate "quick" capacitorchecker.

PYRAMID ELECTRIC CO.1445 Hudson Blvd., North Bergen, N.J.

PYRAMID

NEW Capacitor Resistor -Analyzer another

Pyramid

AND Quick Capacitor Checker first

MAW,1/441\!I.M.WMW4em

the one linethat has everything

a model forevery need

Port al acre/

featuring thetheSHARPEST TUNING

AUTOMATIC ROTOR

model AR -2 ... complete, automaticrotor with thrust bearing. Handsome modern

design cabinet, uses 4 wire cable.

model AR -1 ... same asAR -2 without thrust bearing.

model TR-2... the heavy-duty rotorwith plastic cabinet fea-turing "Compass Control"illuminated perfect pat-tern dial, uses 8 wire cable.

model TR-4... the heovy.cluty rotorcomplete with handsome,new, modern cabinet withMETER control dial, uses

wire cable.

O R

model TR-12.o special combina-

tion value consisting ofcomplete rotor, includ-ing thrust bearing.Handsome, modern cab-inet with meter controldial, uses 4 wire cable.

model TR-11...same as TR12 without thrust bearing.

Here is the one COMPLETE line ofrotors...everything you need because

there is a CDR rotor for every need!SIX skillfully engineered models...ALL

FIELD TESTED AND PROVEN bythousands and thousands of satisfied

users from coast to coast.

RaOtd) to millions every week on TV stations across the nation.

CORNELL - DUBILIERSOUTH PLAINFIELD. N.J.

THE RADIART CORP.CLIEVLI.ANO 13. C)H10

TECHNICIAN March, 1955 11

FOR TV SERVICE

Raytheon Premium C15114-3A, 5U4GB, 6AX4GT, 6SNITO12316, 25CU6.

A SPECIAL GROUP OF TUBESTHAT GIVE YOU MANY

ADVANTAGES AT NO EXTRA COST

For example Raytheon 6SN7GTBha.- these advantages:

O Bumper point micas top and bottom -mount is held rigid in bulb to reduce vi-bration ani microphonics.

10 Slot in micas to reduce leakage betweensections.

O Cathode pinched above top mica fortighter mica cathode fit - lower micro -phonic level.

O Short strog leads support mount atseveral pcynts.

All plate tcbs pinched or welded abovetop mica and below bottom mica tostrengthen mount.

grid design for sharper cut off.

O High conductivity grid winding wire toeliminate g -id emission.

O Short leads - direct to pins.

o Strict control of plate diameters (Geom-etry) for uniform characteristics.

ia) Shorter over all length to improve rigidity.

The lessons learned in structural strength oftubes while developing "rugged" types; thevast warehouse of knowledge about how tomake tubes reliable gathered while develop-ing and pro& cing RELIABLE tubes; therevolutionary new thinking and pioneeringresulting from the development of the rigid,straight lead Raytheon BANTAL Tubes; theboundless skill, know-how and craftsmanshipgathered while designing and producingmore than 250 million receiving tubes, mil-lions of special purpose and picture tubes,and millions of semiconductor products; allthis experience, gathered through more than30 years, makes the new Raytheon 6SN7GTBand other tubes in this series - the finestRaytheon Receiving Tubes that we've everproduced.

They're Right ... 'or Sound and Sight ...Always New ... and Right for You.

RAYTHEON MANUFACTURING COMPANY411.111-64414-0414411fril

RAYTHEON MAKES ALL THESE:

12

AYTH E i N


TECHNICIAN& Circuit Digests

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

It Finally HappenedWhen a good thing is a long time in coming, it's cus-

tomary to say that it arrives with extra impact. Per-haps that's the case with the recognition now being ac-corded the importance of you, the service technician,to the TV industry.

Heavy promotion during the past few weeks has calledattention to National Television Servicemen's Week,March 7 to 12. A similar campaign heralds TV ServiceMonth, which begins April 19. These large-scale effortson the part of set manufacturers to let the public knowyour side of the story are being pushed in the press, onthe radio, and on TV. Everyone wants to give the new

hero that long -delayed pat on the back.Can the picture really be changing? As the favorite

industry scapegoat-the victim of the consumer's mis-placed wrath as well as the manufacturer's short-sightedindifference-you may well be suspicious. After all,what's one week, or even one month? Will you oncemore be shoved aside for the remaining 51 weeks or 11months? We don't think that will happen this time.

Manufacturers have learned it is not sufficient to sellthe distributor or even the final consumer. Experienceshows your role to be pivotal. We feel the new "kid -glove" treatment is here to stay.

While We're on the SubjectA recent request for service data on a popular Hi-Fi

preamplifier brought an interesting reply from the man-ufacturer. With all the courtesy in the world, he in-formed the petitioner that he would be happy to obligebut that the data was not presently available, and hedidn't know when he could make it available. He wasbusily engaged getting out other material that was moreimportant than service information.

We don't know what official stand, if any, this manu-facturer has taken toward the fuss being made over thetechnician. Whatever it is, someone ought to teach him

the facts of doing business successfully. Every bit asimportant as the initial quality of the instrument is thereasonable assurance that it can be maintained in thatcondition and restored to it, in the case of breakdown,in the years to come.

Where sufficient service data is not made availableto you, you are entirely within your rights in telling theequipment owner that his chances of getting the bestpossible repair have been reduced. You are not onlytaking yourself off the hook, you are exerting an en-tirely legitimate pressure on an errant manufacturer.

Sergeant Friday Nabs a TechTV viewers recently saw a "Dragnet" program on

which Joe Friday of the L. A. police went about trap-ping a crooked TV technician.

While we have little sympathy for that small segmentof the industry that gives us all a black eye, the TV showwas a mixed blessing. On the one hand, it pointed outthat a bill of $8.50 for replacing a $2.45 tube was justifiedby the technician's training, expenses, etc. On the otherhand, the sleuths found "clues" of illegal activities suchas: (1) The tech could be argued into lowering the bill,

showing that it was padded in the first place, and (2)the chassis was pulled from the set. No mention wasmade of how often the latter was really necessary.

An informal poll of TV viewers of the program indi-cates that technicians came out on the short end. Thedrama of illegal operation is more easily rememberedthan the quick disclaimer that most are honest. Public-ity-seeking politicians know this too. Let's not be afraidto set the record straight when loose accusations arethrown around.


11,3:y21:frig in theELECTRONIC CLOCKS FOR HOUSEHOLD USE

will be placed on the market by GE, probably later thisyear. The new timekeepers will not require any cordconnection to an electrical outlet. Details concerning op-eration of these devices have not been released, but theguess is that electromagnetically induced signals areamplified in the clock to drive the hands.

THROW OUT ALL ESTIMATES made earlieron anticipated sales of record players and changersfor 1955. While there have been conflicting reportsfrom record dealers concerning the effect of recentprice slashes in the list price of long -play and ex-tended-play records on the record market itself,there is little doubt but that player sales are destinedfor an upward tilt. . . . Will the price cuts impedethe popularity of pre-recorded tape?

DON'T MAKE THE MISTAKE of thinking thattransistors are still in the science fiction class, or eventhat they are many months away as far as you're con-cerned. Several manufacturers, including Raytheon andGermanium Products Corp., are slashing prices on thenew midget miracles, up to 50 percent on some types.At the same time, announcements of new types promisegreater versatility in circuit application. At this rate,transistors will be swooping down at you from all sidesbefore you can heat up your soldering iron in selfdefense.

Tetrode type transistor manufactured by Germanium Products Corp.

MONEY -MAKING IDEAS TO UP SERVICEREVENUE: Long-established Eastern dealer useslarge signs on his building to attract trade. Onesign reads "Over 5,000 Satisfied Customers." An-other stresses that the firm guarantees to bring in acertain hard -to -get channel. . . . The Long IslandRadio & Television Company, Woodmere, N. Y.,maintaining a large and modern service department,attracts plenty of interest with a sparkling Hi-Fiwindow. Signs advise that the firm specializes incustom work and has its own woodworking, design-ing and finishing departments.

SERVICE DEPARTMENT OPERATORS arehaving lots of trouble collecting bills these days, andin many instances the fault lies with the manage-ment. Too few owners have clear-cut policies re-garding payment, with the result that many a re-paired set is returned to the customer who givesthe deliverer that old "I'll -pay -you -later," or "send-a -bill" routine. A smart idea is to get a firm under-standing from C.O.D. customers that the bill mustbe paid when the set is delivered. In the absence ofsuch arrangement, the shop is bound to lose moneyoutright or to wait long periods for the payment.

COLOR RADAR is under study by the armed forces.A system demonstrated recently by Chromatic TV Labsmakes use of a version of their single -gun Chromatroncolor TV tube. The experimental radar indicator is in-tended to make it possible for many different types ofdata to be displayed at the same time, without con-fusion, by the use of different colors for different infor-mation.

TV SALES FAIR IN MOST AREAS, thoughslightly down from first two months of this year.However, the outlook is optimistic, and it's entirelylikely that 7 million black -and -white receivers willbe sold in '55. The color TV picture is still muddled,with some manufacturers looking for a spurt of pro-duction and interest by next September. Small ra-dios, particularly clock, continue to move steadily,and a good season for the sales of portables is rightahead.

THOSE SMART SHOP OPERATORS who stressservice on changers and other phonos via show -windowsigns are making money these days since numbers ofshops are not too eager to work on players or recorders.Fellow we know got a magnetic recorder back unfixedfrom two places after a long delay. Third shop tookhum out with a couple of filters.

14TECHNICIAN March, 1955

Picture111111mm. AiIll&

HI -F1 TRENDS: Another big metropolitan paper isjumping on the bandwagon with a special issue devotedto high fidelity. This time it's the New York HeraldTribune, in its edition for Sunday, March 6 . . . MOREPRE-RECORDED TAPE manufacturers are hitting themarket with their releases. Some of the periodical disccatalogs are beginning to list tapes in a separate section.There is an encouraging trend toward getting togetheron equalization curves for the tapes, or at least publiciz-ing the curves used. There is less agreement, however,on what the price should be per reel. Some makers areasking less than $5 each, others more than $8 . . .

YOUNG FOLKS are responsible for about 50 percentof current sales in Hi-Fi and audio, particularly whenit comes to automatic changers, tape recorders, portablephonos, and discs. These buyers of tomorrow promise abright future for the industry.

PLENTY OF SERVICE BUSINESS lost by num-bers of small shops through the customer -antagoniz-ing practice of closing the place, and leaving with-out any indication as to when it will re -open.Signs, such as those reading, "Will return in a halfhour," are poison, too. Suggestion: Make sure thatsign states hour of return, such as, "10 AM," and soforth. Some technicians with limited capital, find itprofitable to hire housewives or retired persons to"keep shop" while the boss and his men are out oncalls.

THAT TECHNICIAN'S DUMB GIRL FRIEND is stillhorning in on the conversation and she's getting tweeterand tweeter aready. . . . She thinks printed circuitsshould be much easier to read than handwritten ones,and she's sure that a gamma corrector is an Englishteacher. . . . She believes a binding post is a weddingchapel, that a carrier wave is a woman sailor, and tocap the climax her Hi-Fi fan boy friend, who has beenill, got a relapse when she called on him and asked,"Now, how does my audiophile?"

GARAGE -DOOR OPENERS really appear to becatching the public's fancy this time, although at-tempts to put them over in years past never quitecaught on. Signs of the present trend: the field isbeing penetrated by new manufacturers; also, estab-lished makers are reducing prices on current modelsor introducing less expensive versions.

SOME TRENDS ALONG THE SERVICING FRONT:Increasingly large number of shops repairing smallelectrical appliance, and some stocking them for sale.. . . More and more set owners shopping around forprice in big city areas forcing repair prices down in suchareas to an estimated average of 10 percent below thisperiod last year. . . . Technician manpower marketimproved with wage demands continuing high in theranks of the experienced. . . . Bouquets to those man-ufacturers who are spending plenty of money to pub-licize the technician; help raise his prestige. . . . Slowrate of buying used cars being reflected in reduced autoradio servicing in some sections.

AUTO RADIOS are moving along on the currenttide. The entire current production by Bendix Avia-tion Corp. for Ford Motors will feature printed wir-ing, which will help make the sets more compact.The new models are a far cry from the bulky autoreceivers of less than 10 years ago, that used octal -base tubes. Bendix also reports increased demandfor custom -styled car radios as original equipment.

SOME SELL -MORE -SERVICE ANGLES used byprogressive shops these days: Payment of parking feesfor customers . . . Payment of out-of-town phonecharges for customers . . . Drive-in facilities, thus sav-ing pick up and delivery costs . . . Many of the largerdepartments are offering custom service to dealers whohave no maintenance departments . . . In certain lo-calities, shop owners are making money servicing mu-nicipally -owned equipment, such as police radio, elec-tronic signalling devices, and so forth.

"Pull the switches men! Shut off all engines! Mrs. Jones on ElmStreet says we're interfering with her television reception."

BY-PRODUCT OF TRANSISTOR RESEARCHis an interesting development in the field of optics.Germanium is now being used to form filters forinvestigation of the infrared region of the spectrum.Germanium itself, as well as other solid-state mate-rials, has been shown to have many properties ofinterest to the optical designer.

Mar.

May

June

CALENDAR OF COMING EVENTS

21-24: 1955 Institute of Radio Engineers National Convention,Kingsbridg Armory, New York, N. Y.

16-19: The 1955 Electronic Parts Show, Conrad Hilton Hotel,Chicago, Ill. Sponsored by Assoc. of Electronic Parts &Equ.p. Mfrs., Radio -Electronic -Television Mfrs. Assoc.,West Coast Electronic Mfrs. Assoc., National ElectronicDistributors Assoc., Sales Managers Club (Eastern Group).

6-8: The Fourth Annual Convention and Trade Show for theNational Community Television Association, Inc. ParkSheraton Hotel, New York, N. Y.


Simplified Color DemodulationPETER ORNE

In preceding articles dealingwith color -signal demodulation, wehave dealt with receivers that detectalong the I and Q axes. Such setsmight be termed high-fidelity colorreceivers. The advantage in usingthis type of detection is that all ofthe color signal being transmittedmay be recovered and used.

The reader may recall that fullcolor is transmitted up to 0.5 mc,

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Fig. 1-The phase diagram shows how G -Ysignal can be developed from R -Y and B -Y.

which corresponds to large areas ofcolor as seen on the screen. Beyond0.5 mc, sidebands of the Q signal arenot transmitted, but I sidebands(orange and cyan) continue on upto 1.5 mc, which corresponds to themedium-sized areas as viewed onthe screen. Beyond this frequency,only luminance (brightness) infor-mation is transmitted up to 4 mc,for small areas and fine detail. Thisfailure to transmit full color forsmall, detailed areas is not con-sidered a great loss because thehuman eye, correspondingly, losesits ability to distinguish betweencolors as the areas on which they ap-pear decrease in size.

When demodulation along theR -Y and B -Y axes is used, stillmore of the full color is lost, but im-portant design economies can be af-fected. For one thing, the bandpassof the receiver's color section is re-duced, thus allowing higher gain perstage. Obviously, this makes possiblethe elimination of some stages ofamplification. Also, it now becomes

R -Y and B -Y Detectors Avoid the Complexpossible to perform color addition inthe crt itself. The latter arrange-ment eliminates the need for sepa-rate matrix and adder stages. Twoexamples of color sets using suchsimplified systems are the RCA 28-tube circuit and the Motorola 29 -tube receiver.

The basic system for the equibandset-as such color receivers arecalled-follows this pattern: Thecolor -carrying portion of the videosignal is built up through a bandpassamplifier. This stage eliminates theunwanted portions of the video sig-nal, amplifying only that portionwhich falls between 3.1 and 4.1 mc.Since the color subcarrier is at 3.6mc, it passes through the amplifier,along with those sidebands that fallwithin 0.5 mc to either side of it. Inthis portion of the color signal, wehave a straightforward set of rela-tionships: the phase of the sub -carrier varies according to hue, andsubcarrier amplitude varies accord-ing to saturation.

After suitable amplification, thesesignals are applied to the color de-modulators, where detection takesplace in the following manner: thesuitable phase of the local subcarrieroscillator is made to beat againstcolor signal. One way of accomplish-ing this is to let the demodulatorconduct only during subcarrierpeaks. In this method, proper sub -carrier phase is selected simply byadjusting the local oscillator so that

Fig. 2-Simplified block diagram of the

peaks appear at the proper time. De-modulator output will then dependon the amplitude of the color videosignal at that particular moment.Since the transmitted color -sync 8-cycle burst is exactly 180 degreesout of phase with the B -Y signal(see Fig. 1), we have a very simplephase relationship to work with.

Two Demodulators Used

Two demodulators are used in theset to give R -Y and B -Y respec-tively. One might think that anotherdemodulator would be necessary toget the third color -difference signal,G -Y. Such a demodulator could beused, but it would be expensive. Thephase diagram (Fig. 1) indicates thephase of the subcarrier that wouldhave to be used for a G -Y detector.But it can also be seen from thediagram that G -Y can be made upby adding the proper amounts ofR -Y and B -Y in the proper polarity.Putting it in the form of a mathema-tical formula, we can say

G -Y = - .51 (R -Y) - .19(B -Y)We can therefore take the output

of the R -Y and B -Y demodulatorsand use a resistive matrix with anadder stage to get the G -Y signal.In the Motorola receiver, this sys-tem is followed. The output of eachcolor difference amplifier is fed tothe grid of the corresponding colorgun. The three cathodes are con-nected together and the -Y signal is

demodulator section in the Motorola set.

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Circuits for Latest DesignsCircuitry Needed for 1 and Q Detectionapplied to them. The actual signalcontroling the beam of each gun willthen be the difference between thesignal on the grid and the signal onthe cathode. On the red gun, forexample, the grid signal (R -Y)minus the cathode signal (-Y) isequal to R. The beam of the red gunthus varies in intensity according tothe red signal. The same applies tothe other two guns. In order to getthe correct polarity for green, onemore stage, the adder, is used in thegreen channel.

In the RCA receiver, the designerswent one step further. The G -Ysignal has been shown to consist ofa certain ratio of - (R -Y) and- (B -Y). But the reader will re-member that plate and cathode volt-ages are 180 degrees out of phase.Thus if we have R -Y signal in theplate of a tube, the signal in thecathode will be - (R -Y). This prin-ciple can be utilized to get all threecolor -difference signals from theoutput of two demodulator tubes.The plate output of the two demodu-lators will be R -Y and B -Y; and theG -Y signal is taken from the com-mon cathode circuit of the two de-modulators.

Problems Arise

The trouble with a circuit of thiskind is that a signal at the cathodeof a tube has a degenerative effecton output. If we start with B -Y onthe plate of a tube, for example, andthen apply G -Y to its cathode, theplate signal will no longer be B -Y.The adjustments necessary to get theproper outputs can be determinedmathematically. In brief, withoutgoing into the necessary mathema-tical analysis, relationships are cor-rect when the following conditionsare met:

The plate load of the R -Y de-modulator must be twice the cath-ode resistance. The plate load of theB -Y demodulator must be 5.25 timesthe cathode resistor. The amount ofcolor sideband applied to the B -Ydemodulator must be 1.4 times theamount applied to the R -Y demodu-lator. Finally, the phase anglebetween the 3.58-mc signal fed tothe two demodulator grids must be63.5 degrees. When all these condi-

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Fig. 3-Simplified block diagram of the demodulator section in the RCA receiver.

tions are met, the three outputs willbe B -Y, R -Y, and G -Y.

It should be noted that we losesome of the simplicity of the pre-viously described system in that weare now dealing with phase anglesthat are fractions; to offset this,however, we have completely elimi-nated an adder stage.

The arrangement just describedalso poses some interesting problemsfor the service technician. The in-teraction between the three outputswill doubtless create difficulties. Tooffset this drawback, however, thenumber of components which wouldhave to be checked in case of troublein this circuit has been considerablyreduced.

There is one other noteworthy de-parture in the RCA receiver. Thedemodulators just described are so-called high-level demodulators andtheir output is applied directly to

the grids of the cathode-ray tubeguns. This is again a saving, sincethe necessary amplification is ob-tained in one stage-as long as thesignal involved is still the colorsidebands. On the other hand, threestages (one for each color) are re-quired for amplification if we do itafter demodulation.

The difficulty with high-level de-modulation is the large amount of3.58-mc signal that is now present inthe set. Very careful shielding andlayout are required to prevent 3.58-mc interference between differentsections of the receiver, or from onereceiver to another. In working onthese sections, the service technicianshould always be certain to replaceany shields that may have been re-moved to gain access to a compo-nent. It is also important that allcoils be restored to their originalposition.

Better B & W Pix from Color SignalsA new development in color

broadcasting is said to improve thequality of the picture viewed onhome monochrome receivers. Thenew technique, reported by GE de-sign engineer Pierre H. Boucheron,is also reported to simplify colorregistration in the studio. The re-ceived color picture is also madesharper.

Previous methods formed theblack and white picture by super-imposing red, blue and green images.

Unless registration is absolutely per-fect with this method, the picturebecomes fuzzy. With the new tech-nique, the monochrome pix isformed directly from a sequentialcolor camera before registrationproblems are met. Color signals arepicked up independently by the se-quential camera.

The two independent signals arecombined into a single signal beforetransmission. The reduction in mis-registration improves sharpness.


Radio -TV Rectifier andHow Much Do You Know About Half -Wave, Full -Wave, Bridge,

Part I

MICHAEL CRAIG

Since most technicians still dowork on ac -dc AM radios, andbecause the rectifier circuit used insuch sets is fundamental, it is thebest one to start with. Half -wavecircuits are in the majority, with the35Z5GT tube being the most com-monly used one for this purpose.Others are the 35Z3, 35Y4, and35W4. In portables we find the117Z4, 117Z6, and 25Z6GT in oldermodels, with most of the new onesusing selenium rectifiers rated at 75or 100 ma.

Half -wave rectifiers are alsousually found in low-priced, self-contained power supplies for phonoplayers which use either a dual tube,such as the 117L7GT or the equiva-lent 35Z5 and 50L6GT combination,as shown in Figures 1 and 2. R1 iseither a fixed wire -wound resistor ora line cord resistor. CH is either asmall a -f choke, if a PM speaker isused, or the field coil of an EMspeaker. R2 may replace CH, usinga value of approximately 1000 ohms,with somewhat reduced efficiency.Ck reduces degeneration, especiallyof the lower frequencies, but maybe left out for reasons of economy.

In Fig. 1, the net effective B volt-age available for the output circuitis 110-10, or 100 volts while in Fig.

Fig. 2-Alternate circuit for single -stage phono amplifier, showing negative voltage source.

2 the full 110 volts is used for in-creased output and quality. In thelatter case, the choke or speakerfield is in the negative lead of thesupply circuit, and the drop acrossit is used to furnish bias for the out-put tube grid circuit, while the cath-ode is returned to ground. Thiseliminates the need for a large ca-pacitor at this point. Instead, a 0.05or 0.1 mfd capacitor, in conjunction

Fig. 1-Circuit of a simple single -stage phono amplifier, showing half -wave rectifier supply.

with a 0.1 megohm resistor, is usedto filter any residual hum from thecircuit. The phono cartridge gener-ally used in these units is of the highoutput variety, delivering from 4 to5 volts peak to the grid. Thoughthis doesn't drive the output tubeto recommended maximum, it isusually sufficient for an ordinaryroom.

Many special circuits, such as areused in juke -box amplifiers and insome TV receivers, entail a negative -going supply; that is, one where thepositive side of the filter capacitoris grounded and the negative sidegoes to the bias or other control cir-cuit. Fig. 3 shows such a circuit.Here both negative and positivevoltages are secured from the sametransformer winding, the tap on thewinding furnishes bias voltage (afterrectification and filtering).

With slight modifications, this cir-cuit is similar to that used in mostoscilloscopes, where positive voltageis required for the amplifier tubeplates (usually around 300 volts),and negative voltage on the order of2000 volts is supplied to the CRTcathode with the plate, or anode, be-ing grounded. This is done for the


Po er Supply CircuitsDoubler and Tripler Circuits-Though You See Them Daily?

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Fig. 4-Ripple filtering, half -wave rectifier.

sake of the user's safety, as the high -voltage anode and two of the de-flection plates are at the same po-tential, or ground. If this were notdone, high voltage would be presentat the input posts if the couplingcapacitor broke down, or if directconnection to the deflection plateswere made for d -c readings.

As previously mentioned, the sim-plest rectifier types are of the half -wave variety. Because no rectifica-tion takes place on the negativehalf of the cycle, the output, beforefiltering, consists of 60 pulses of cur-

rent or voltage per second. Heavyfiltering is thus required to smoothout the output (when drawing aload from the circuit) to fill in thegaps between pulses. This is shownin Fig. 4A, B and C.

Fig. 4B shows how the averagedc output drops and how the rippleincreases as the load is increasedwhen fixed standard filtering is used.Curve 1 represents the output witha fairly light load; curve 3, with arelatively heavy load. These curvesmay also be used to illustrate whathappens when, with a fixed load, thevalue of the filter capacitor is de-creased. This may happen as a setages and the electrolytics lose capa-citance. In none of the curves of Fig.4B is the hum ironed out completely.The enclosing dotted rectangle showsthe ideal output, such as we mightobtain from a perfectly regulated desupply.

If full -wave rectifier circuits areused, less filtering is required to ironout the hum ripple, as the ripplefrequency is now 120 cps instead of60 and the filters are twice as effec-tive as before. To point up the addi-tional wattage required by a tuberectifier as compared to seleniumtypes, the full -wave rectifier circuitin Fig. 5 shows a 5U4G tube andtransformer. This tube draws 3 ampsat 5 volts for the heater filament, or15 watts; and allowing for an effici-ency of 80% for the transformer, itwill require 18 watts more power to

Fig. 3-A separate rectifier is used with its own filters to develop a negative source.

AC

0 SEC 120 ,131%EFILTERED

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Fig. 5-Full-wave rectifier, 120 cps ripple.

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1/601h SEC .

Fig. 6-Full-wave bridge rectifier circuit.

operate this tube than a comparableselenium rectifier. In addition, thereare losses due to the plate -to -cath-ode drop in voltage.

Because of the low forward resis-tance of the selenium rectifier, theregulation on large surges of cur-rent is better, since the voltage dropacross the rectifier is low. Smalllimiter resistors (from 10 to 40ohms) must therefore be used withthem to lower the initial chargingsurge to the capacitors. This parti-ally nullifies the advantage so faras regulation is concerned.

The same rectifier circuit shown inFig. 5 may be used with seleniums.

(Continued on page 57)


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TV &Wei Mo%THApril 19 May 19

Ask About Our Special Offer

TuneThese Manufacturers'

INDUSTRY SURVEY I

During these next few monthsmagazines, newspapers and radioand TV will see an unprecedentedflood of nation-wide publicity andadvertising on behalf of the TV serv-icing industry. Two large compa-nies are throwing the full weight oftheir advertising budgets into theirrespective "TV Service Month" and"National TV Servicemen's Week"campaigns. Other elaborate promo-tions are being planned by a numberof tube and replacement part manu-facturers.

At this time, when such tremen-dous expenditures are being madeon our behalf, it seems appropriateto call attention to the many benefitswhich we enjoy year in and year outthrough our association with thetube manufacturers. The high pointsof the companies' promotional pro-grams are described below; it isworth remembering, also, that ail re-placement part advertising, whetherthe technician is mentioned or not,is ultimately for our benefit. We arethe ones who will install and servicethe parts.

To bring you this up-to-date re-port, TECHNICIAN's editors can-vassed all the major tube manufac-turers for details on their current orplanned promotions and specialbonuses which they are offering toTV technicians. Let's derive themaximum benefit from these cam-paigns by starting sales and check-up promotions in our own shops-tying in with the manufacturers'national programs, and using thewealth of displays, mailers, etc.,available from these companies ortheir distributors.

CBS-Hytron

Plans are afoot for a big new pro-motion due to break this spring. Inthe meantime CBS-Hytron con-tinues to make available to the tech-nician one of the largest selectionsof tools, service aids and promotionalmaterial. The complete program isdescribed in their "Business Build-ers Catalog" available from CBS-Hytron tube distributors.

Up Your Sales PitchPrograms are Made -to -Order - For Sales -For You

DuMont

The Cathode Ray Tube Div. islaying plans for a contest but willnot release details at this time. Salesemphasis is on the "new -set per-formance" of their replacement pic-ture tubes. Green and gold medal -type stickers displayed on crt cartonsassure the consumer that the re-placement tube is equal in quality tothose used in new sets.

G.E.

The big news here is "TV ServiceMonth"-April 19 to May 19. Theprogram will be touched off by ahuge advertisement in Look maga-zine and the month -long campaignwill be supported by promotionalpieces, store banners, windowstreamers, side walk footprints, and"talking postcards," to be played onconsumer's phonographs. Highlightof the promotion will be a $25,000jingle contest. The aim of the cam-paign is "to focus attention on thetechnician-dealer as a friend andneighbor-and to call for direct at-tention in ordering long -put -off re-pairs."

Ho ydu Bros.

Keynote of the sales promotionand advertising of Haydu Bros., div.of Burroughs Corp., will be the"Trade -In System" in which usedTV picture tubes are accepted ascredit toward the purchase of Haydutubes. Sales emphasis will be on the

4 increased volume of business thatdealers and jobbers will experiencethrough this arrangement.

Philco

The current advertising programat Philco is wrapped around the new"Star Bright 20/20 Aluminized Pic-ture Tube." Available from Philcodistributors are a series of news-paper ads in mat form, printed radiospot announcements and a series ofsales -getting post cards. For thedealer's own store, there are windowstreamers, store posters, and a help-ful crt cross reference replacementwall chart.

Raytheon

The 9 -year old "Bonded ElectronicTechnician" program, whereby Ray-theon issues registered bond certifi-cates to selected radio -TV servicedealers, ranks as one of the majorcontributions toward improving pub-lic confidence in the TV technician.To qualify, service dealers are firstrecommended by the Raytheon tubedistributor, and then must meet theapproval of both Raytheon and theinsurance company which posts thebond. In addition to the certificate,Raytheon supplies the bonded dealerwith Creed displays, window decalsand identification. Advertisementspublicizing the program appear inLife magazine.

RCA

The big week for RCA will beMarch 7-12-"National TV Service-man's Week." The promotion will bemarked by a nation-wide RCA ad-vertising and publicity campaign de-signed to focus maximum consumerand industry attention on the na-tion's more than 100,000 servicemen.Prizes totalling more than $10,000will be awarded to radio -TV tech-nician-dealers initiating the mosteffecting National Week promotionsat the neighborhood level. Symbol ofThe Week is the RCA "ElectronicStatuette," a 14 -in. high, gold -fin-ished figure holding an electronicemblem, and standing on a base en -scribed with a dedication to TV serv-icemen.

Sylvania

Sales emphasis at Sylvania is ontheir new "Silver Screen 85" cathoderay tube. Through their nation-widetelecasts of the "Beat the Clock"show they are taking their advertis-ing directly to the consumer. In themill are plans for a big celebrationlater this month in honor of their25th anniversary. High spot of thepromotion will be a special contest.

As a tube purchase bonus, Syl-vania is currently offering techni-cians an exceptionally well designedtube caddy which is unique in itsadaptability to both home servicingand bench use.

Tung -Sol

The emphasis here is on personal-ized advertising to make the Tung -Sol serviceman distinctive in hiscommunity. Aim is to get thedealer's name on as many items aspossible, and to feature the dealer'sservice and name over the name ofTung -Sol. Among the items designedto assist the dealer at the local levelare newspaper mats, direct mail lit-erature, technical aids and illumi-nated signs. Also available at nomi-nal charge are shop and countercoats, stationery, calendars and uni-forms.

Westinghouse

High spot of Westinghouse salespromotion will be the direct -to -con-sumer advertising soon to appear inselected editions of TV Guide. Thecost of the ads will be shared withlocal distributors who will list theirkey technician -dealers. Also beingpushed is the Premium of the MonthClub, in which selected tools and ac-cessories are being offered as tubebonuses. Westinghouse also featuresa particularly elaborate selection ofdirect mail literature, post cards andenvelope stuffers.

In addition to the items listedabove, virtually all the manufactur-ers offer cooperative advertisingprograms under which the localdealer and the manufacturer splitthe cost of advertising productsbearing the manufacturer's name.

To, participate in these programs,contact the nearest distributor han-dling the particular line in whichyou are interested. Field representa-tives of the manufacturer are con-stantly contacting radio -TV techni-cian -dealers to assist them in theirolcal advertising and to keep themaware of the newest sales promo-tions.

We have here a golden opportun-ity to raise the professional statusof our whole industry but it willonly be done with a concerted effortby all involved-the technicians, aswell as the manufacturers.


Shop Hints to Speed ServicingTips for Home and Bench Service Contributed by Readers

Raster Loss, TeleKingThis is a failure I ran into more

than once on TeleKing model XT100series receivers. The same fault oc-curs on Coronado receivers whichuse a similar chassis, and others. Thesymptoms are: no raster, no high-voltage, but fuses and tubes areokay. Test voltage on prong 5 or 7of the socket for the 6AL5 horizontalphase detector. If it is too high, sim-ply replace C-211, which is 0.001mfd, 600 v.-Ralph Hayes, Rochester,Minn.

Dial Belt Replacement-Managing on a Shoestring

Many radio receivers still use beltsinstead of cables to operate the dialmovement mechanism. Sizes of thesebelts vary. There is no standard, andkeeping many sizes in stock is aproblem. However, the ordinaryshoestring is a near approach to a"universal" belt.

To make the substitute belt, wrapthe string twice the pulleys,as shown at A. Pull the two endstight and knot them as shown at B.With needle and very strong thread,sew the string at the two points asshown; after which snip the stringsbeyond the sewn places (sketch C).Put a dab of cement under eachclipped end, applying a clampingpressure with long -nose pliers untilthe cement has set; then let dry.

Thus prepared, the belt will glidesmoothly over the pulleys, especiallyafter a liberal coat of dial cord dress-ing. I've used one such shoestring-belt for over two years.-J. Amo-rose, Richmond, Va.

Step-by-step procedure for custom -fabricating

Home-made GrommetsWe keep a length of auto wind-

shield -wiper hose in the shop, tobush odd -sized or odd -shaped holesin all sorts of chassis and appliances.Suitable grommets are readily madeto fit any shape of opening by cutting

0

0

SPLITHERE

PREAD ANDAPPLY GLUEHERE

Windshild wiper hose is source for grommets.

off the proper length of wiper hose,splitting it open (as shown in sketchA), applying cement to the cutedges, and curling the hose intoshape (as at B) so that it can be putsnugly into place to line the hole.-Henry Josephs, Gardenville, Penna.

CRT Filament CheckerMany times before putting to-

gether the simple testing device de-scribed here, I found it difficult todetermine whether the picture tubefilament was truly open, or whetherit was simply the socket that was de -

dial belt substitutes with ordinary shoestring.

WRAP SHOE STRING AROUND

PULLEYS

PULL STRING-TIGHT; TIE

KNOT HERE

(2 TURNSOF SHOESTRING)

SEW WITHSTRONG THREADHERE

CLIP HEREAND DABWITH DUCO

SEWNTHREADS

CLIP HERE".-- AND DAB

WITH DUCO

fective. Simply connect two leads toa No. 44 panel lamp mounted in asuitable socket. Insulated leads areused, but the ends away from thesocket are stripped bare so that theycan be used as prods.

If the crt filament fails to light, Iremove the socket from its base andinsert the prods of the test lampquickly into the filament connec-tions. If the lamp lights, the crt itselfis the source of the trouble. Thiscompact tool may be carried easilyon calls. The system really pays offin time saved that would be spent inpulling out and setting up a meterto make the same test.-J. L. Man-cini, Winthrop, Mass.

Quick AGC CheckA shortcut that is frequently help-

ful in troubleshooting agc-relatedstages, such as the i-f strip or thetuner, involves a meter check oneither side of the resistor in the agcline. Readings taken on either sideof the resistor (usually 500k to 1meg) shown in the sketch should bevery close to each other. If the read-ing is noticeably higher (less nega-tive) on the side of the resistor near-

AGCLINE

ACCDETECTOR

2 6AL5

Check on each side of resistor shows fou!t

est the condenser than it is on theother side, a defective tube or a de-fect in the tube's circuit is permit-ting too much current to be drawn,and the agc line is being loaded.

To localize the bad tube or stage,leave the vtvm connected to thepoint along the agc line where thehigh reading is obtained and substi-tute or remove tubes in the video i-fand tuner sections. If substitution orremoval of a tube restores the read-ing, so that it is the same on eitherside of the resistor, the fault is local-ized.-W. A. Skowron, Wichita,Kans.

22

New Products Begin on Pg. 30


Adding Extra SpeakersMismatch, Phasing, Other Problems in a Hi-Fi Sideline

The advent of Hi-Fi does not meanthat every person whose interest hasbeen awakened goes out to buy acomplete high-fidelity system all atonce. Many fans are building up ona budget basis, piecemeal. The in-stallation of a new speaker to re-place or supplement an existing oneis a common measure. In many cases,the speaker is used with an oldersound system that is acceptable,either permanently or temporarily.In other cases, a speaker may beadded to simulate a stereophoniceffect.-Ed.

With the publicity about betteraudio quality from home equipment,many inquiries are being receivedabout adding an additional speakerto present equipment. In almost allcases the speaker required is largerthan the one now in use with radio,phono or TV amplifiers in the cus-tomer's home.

Some suggestions on obtaining themost benefit from the combination oftwo speakers are worth consideringif the final results are not to be dis-appointing. After the customer hasput some money into an additionalspeaker and housing, he wants tohear the difference, and he expectsthe new speaker to be the mostprominent from the standpoint ofvolume as well as quality.

Where two speakers being drivenfrom the same source are placedfairly close together, phasing is im-portant. If the speaker cones are

Fig. 1-Phasing speakers with flashlight cell.

moving in and out when energized inopposite phase, cancellations will oc-cur at certain points in the room andat certain frequencies that will dis-tort the response, and a definite dropin volume may be noticed at somepoints. A simple method for checkingproper phase is shown in Fig. 1. Theline feeding both speakers, in paral-lel, is cut at point "X" and an ordi-nary flashlight cell is connected

M. G. GOLDBERG

across the break momentarily. Thisshould cause both speaker cones tomove in the same direction. Whenthe cell is removed, the speakercones should both bounce in the op-posite direction. If one cone movesforward while the other moves back-ward, the speakers are out of phaseand the leads to either one or theother should be reversed.

When the newly attached speakeris the larger of the two, as is usuallythe case, another problem may arise.The small speaker in the existingequipment probably has an imped-ance of about 4 ohms, while thelarger speaker may be expected tohave an impedance of 8 ohms ormore. In this case, most of the am-plifier output would go to thesmaller unit, with results unsatis-fying to the customer.

Fig. 2-Matching connection, added speaker.

In Fig. 2, we see the two speakersconnected in parallel, the larger oneby means of a plug and jack so thatit may be disconnected at will. Notethat a 2 -watt resistor, 2.7 to 4 ohmsin value, is wired into the jack cir-cuit. Thus, when the larger speakeris disconnected, the resistor isshorted out and the small speaker ismatched directly across the second-ary of the output transformer. Whenthe plug to the extra speaker is in-serted in the jack, the resistor isthen in series with the voice coil ofthe small speaker, while the larger

What happens when an ion -trapmagnet "drifts"? When does agood tube show low emission?For answers to these questions,see "Tough Dogs" on page 24.

speaker, directly across the trans-former, does not have to share out-put with a series resistor. It there-fore produces more output than thesmaller speaker. Also, the matchingbetween speakers and output trans-former is now correct, as we havetwo 8 -ohm leads in parallel across a4 -ohm output. If the original speakerhad a voice coil impedance other

Fig. 3-Mismatch, power loss in long wires.

than 4 ohms, the same system can befollowed with different values.

On long speaker runs, the size ofthe wire used becomes important. Apair of no. 18 wire leads will have aresistance of 1 ohm per 65 ft. (roundtrip). If the run is longer than this,considerable loss of power may oc-cur in the lead and mismatch will beproduced, unless the size of the wireis increased (that is; the wire num-ber is made smaller).

Convenient rule -of -thumb calcu-lations may be made, in the case oflong runs, without resorting totables. First of all, it must be remem-bered that 1000 ft. of no. 10 wirehave about 1 ohm of resistance.From this base point, the resistanceof a wire will double every time thesize goes three numbers higher. Inother words, 1000 ft. of no. 13 wirewill have 2 ohms resistance. Con-versely, 1000 ft. of no. 7 wire (threenumbers lower than no. 10) willhave only 1/2 ohm resistance; thatis, half the resistance of 1000 ft. ofno. 10.

The importance of taking wire re-sistance into account over long runsis illustrated in Fig. 3. Two 8 -ohmspeakers in parallel are shown, withone of them at a remote location, 125ft. away, connected by no. 22 wire.The equivalent circuit indicates thelack of balance between the speak-ers, the waste of power in the wire,and the mismatch.


"Tough Dog" CornerDifficult Service Jobs Described by Readers

Wild Vertical OscillatorHere is a rather unusual fault

which took a lot of time to clear.The symptoms: about half the nor-mal vertical deflection; jagged edgeson the sides of the raster; black andwhite lines across the screen (as ifthe picture were truly out of hori-zontal sync); no clear-cut edge attop and bottom of the shrunkenraster; and a fizzing sound from theyoke.

A check in the horizontal depart-ment showed correct conditions andfrequency. With the scope appliedto the grid of the vertical outputtube at the socket, the oscillatorfrequency was an unstable 1200 cpsor so-whether the output tube wasin or out of the socket. Carefulchecks of the integrator network,blocking oscillator transformer andall other components in the oscilla-tor grid circuit showed no abnor-mality; component changes did notimprove the fault.

Closer checking indicated the de-fect was definitely in the oscillatorplate load circuit. The 3.3 meg and4.7 meg resistors (see sketch A)checked normal, as did the 0.1 mfdcoupling condenser. Shunting theplate load resistance with 1 meg,however, lowered oscillator fre-quency considerably. Next the saw -tooth shaping network of 8.2k and0.03 mfd was disconnected, makingno change in frequency or waveformshape. Making no change! . . . Theresistor measured normal, but thecondenser was wide open. Replacingit cured the fault.

I had regarded the network as be-

ing merely concerned with formingthe waveshape of the drive voltage.A good look at the circuit shows thenetwork is effectively in parallelwith the plate load of the oscillator.It is, in fact, part of the plate loadimpedance. This was my first en-counter with the fault. A couple ofweeks later, another instancecropped up in a vertical -chassis Ad-miral. Condenser C (see sketch B)went open and caused the sameeffect.

If this "dog" story is worth tenbucks, it will just about repay theloss I made on the repair of the firstset!-R. Eldridge, Vancouver, Can-ada.

No Ground for ComplaintA new model was brought to the

shop with the complaint of insuffi-cient vertical deflection. Accordingto the customer, the defect hadexisted since purchase of the set andwas more noticeable in the evening.After a 45 -second warm-up, theraster developed just enough verti-cal height, with poor linearity.

Height and linearity controls werealready set at maximum. Verticaloscillator and output tubes were re-placed, to no avail. A check of theoutput stage (12B4) showed all volt-ages well within tolerance. Remem-bering that the condition becameworse in the evening, I turned mysoldering gun on to load the ac line,and noticed a decrease of about 20percent in vertical scanning. Whenthe line was loaded, the sawtoothwaveform at the grid of the 12B4output tube remained unchanged,

VERTOSC

VERTOUTPUT

0 ID

$10 For Your "Tough Dog Story"Have you tangled with a difficult or ob-

scure service problem recently? Write it up,telling us how you licked it, and send it to"Tough Dog" Editor, TECHNICIAN, Caldwell -Clements, Inc., 480 Lexington Ave., N. Y.17, N. Y.

but fluctuated considerably at theplate. However, de plate voltage re-mained constant.

Everything pointed to low emis-sion of the 12B4, but everything hadbeen checked-that is, I thoughteverything had been checked. Onlythe filament voltage hadn't been in-vestigated. When I discovered thatone half of the center -tapped fila-ment had never been provided withthe necessary ground connection, Icould have jumped through theroof! proper groundconnection correctly placed 12 fullvolts on the filament and correctedthe trouble.-F. Fetrow, Harrisburg,Penna.

Brightness DriftsWhen the TV set was first turned

on, the picture was bright and clear.About an hour later, the raster fadedout. To restore the picture, the sethad to be turned off for approxi-mately two hours, then turned onagain. The crt, the 2nd anode volt-age, as well as other tubes, voltagesand components in the associatedbrightness and high -voltage circuits


Circuits in which open capacitor in the sawtooth shaping networkfrom vertical oscillator plate to ground reduced load impedance onoscillator and caused a drastic upswing of oscillator frequency.

OSC OUTPUT


What's New in TV Tuners?Streamlined Turret -Type Front End Reduces Costs

Recently released to manufac-turers of TV receivers is a newlower -priced line of turret -typetuners, featuring changes from theconventional design that has cometo be associated with the type.

The Standard Coil "T" Series fea-tures four basic types. Two pentodetuners are included, one for use with21-mc i-f systems, the other de-signed for 41 -me i-f operation. Theother two types are cascode ver-sions-again, one each for 21 and 41mc. All models are available ineither 12- or 13 -position turrets andmay be wired to accommodate eitherregular 6.3 -volt filament tubes orseries tubes for 600 -ma operation.(For a more detailed breakdown ofthe various models, see this month'sCircuit Digest section.)

One innovation results in elimi-nating the need for individual mixercrystals on every UHF channel towhich the tuner is subsequently con-verted. As shown in Fig. 5, only asingle crystal is now mounted on

Fig. 1-Externally, the new streamlined frontend resembles many of the preceding versions.

Fig. 2-View from above with top plate removed.

R. S. LEWISSTANDARD COIL PRODUCTS Co.

each individual UHF strip. This isthe harmonic generator. The singlemixer crystal that serves for all ismounted on top of the tuner chassis,where it is held in place by a bracketand screw. One end of the mixer isgrounded through the bracket; theother end is connected to a springcontact, through which it is intro-duced to the UHF strips.

Another new feature involves adeparture from the use of a pair ofcoil strips for each channel. In the"T" series tuners, all the coils for asingle channel are fixed on a singlestrip. The strips, held in the turretby spring tension, can easily be re-moved. This is accomplished byexerting pressure on the strip re-taining spring, which is located onthe turret between the center andthe rear of the tuner, and lifting out-ward on the strip. The opposite endof the strip is engaged in a slot inthe front turret plate. The new tur-ret is shown in Fig. 4, with one of thesingle -strip coil sets removed to il-lustrate the new arrangement.Further clarification of the mountingset-up appears in the exploded viewshown in the Circuit Digest' section.

When assembled, the "T" seriesfront end does not appear to differgreatly from earlier tuners in theturret line. Alignment procedures,

Fig. 3-Inside view of the tune. with the tur-ret drum removed to expose the spring contacts.

Fig. 4-New turret holds single -strip Insertsfor each channel with spring contact and slot.

location of adjustments and serviceconsiderations are much the samefor all tuners in the series. For fulldetails on these matters and otherpertinent data, see Circuit Digest184.

Fig. 5-Each UHF strip carries its own individual hor nonic generator crystal, but a singlemixer crystal, which is mounted on the chassis, is used in conjunction with all UHF strips.


Auto Radio Bench HintsHow to Substitute a Cut-out for a Fuse on Your Test Bench

Using Cut -Outs in AutoRadio Servicing

Technicians doing auto radio serv-icing know that the cost of fuse re-placement can run into dollars peryear for bench service alone; asso-ciated with this expense is the nui-sance of replacing the fuses, and theslow -up of servicing each time a fuseis blown during tests. To avoid suchtroubles, the writer uses an ordinaryauto -radio generator cut-out inplace of a fuse (see Figs. 1, 2).

This set-up, incidentally, elimi-nates the possibility of a fire beingstarted by a short-circuit at thepower supply input of an auto radio.It not infrequently happens that anauto radio that has not been discon-nected from the storage batterypowering it is left overnight on theservice bench. Even with the switch"off," a short-circuit may develop;traffic passing during the night maycause wires to move or slip alongthe bench, possibly introducing ashort that will make the wires redhot and start a fire.

One cut-out can be used with a6-v supply; the other with a 12-vone. The cut-out is connected inseries with the power supply beingused and the receiver under test. Itcan be adjusted to open automati-

Fig. 1-Photo of cut-out that can be usedto replace fuse in auto radio service work.Only the heavy -turn coil is visible; thefine -wire winding is inside this coil. Con-tacts have been altered to the solid -lineshape shown in Fig. 2B. Cover is at top.

BY MAURICE MICHAELS

cally when a certain current is ex-ceeded. For instance, if the averagereceiver to be serviced takes from 6to 7 amps, the cut-out can be set toopen -circuit at 10 or 12 amps.

The manner in which the cut-outfunctions as a fuse may be describedas follows: Normally the contactsare closed, and current flows withnegligible drop through the heavywinding of the cut-out, the fine -wirewinding being shorted out underthese conditions (see Fig. 3). Whena sudden overload occurs-due to a"stuck" vibrator or a shorted filter,say-the excessive current producesa magnetic field that is large enoughto overcome the spring tension,causing the contacts to open. Cur-rent now flows through the fine -wirewinding (since it is no longer short-circuited), causing it to be ener-gized. This activation of the fine -wire winding increases the mag-netic field that is pulling the con-tacts away from each other, and in-sures that these contacts will remainapart for as long a time as the over-load is present. In fact, even if theoverload is removed, the currentflowing through the fine wire fromthe battery will keep the contactsapart until the circuit is interruptedby disconnecting the wires to thebattery or the receiver.

The reader should note that cur-rent continues flowing through thebattery, the fine -wire winding andthe receiver in the presence of anoverload. This current is, however,limited to a maximum of .2 ampseven when a dead short is presentacross the power input terminals ofthe set.

Only enough turns should be re-moved from the heavy coil to keepthe cut-out from opening under nor-mal operation. (If too many turnsare removed, the spring tension willhave to be reduced, and "chatter-ing" may result.) The spring tensionof the contacts is increased by re-shaping the spring in the mannershown in Fig. 2B; good contact isprovided by the procedure, and thechances of the cut-out opening un-der normal operation are furtherreduced.

INPUTFROM

GENERATOR

- POLE PIECE

0

.LIMPER

0

OUTPUT TOBATTERY

CONTACTSARE NORMALLYCLOSED

Fig. 2A-Sketch of cut-out as it originallylooks. B-How cut-out looks after alteration.Note what has been done to the contacts. IAphotographic view of the altered contacts isshown In Fig. H. Note also the lumper wirethat is connected between points X & Y.

For the 12-v cut-out, the heavyturns can be left alone; all one needsto do is bend the contacts into theshape shown in Fig. 2B, and con-nect a jumper wire between pointsX and Y in the base of the unit.Since point X connects to the baseof the cut-out, the frame (whichalso contacts the base) must not begrounded to any part of the circuit;to avoid an accidental ground of thiskind (which would short-circuit theset input), the cut-out frame maybe mounted on a piece of insulatingmaterial.

The reason all the turns can beleft on in the case of the 12-v unitis that less current is drawn by the


Fig. 3-Schematic of cut-out and its circuit.

FINE -WIREWINDING ' PIVOT

"HOT" LEAD

WINDING

NORMALLY- CLOSED

CONTACTS

TO RECEIVER


Lead Dress TroublesChart Listing Symptoms, Causes and Remedies for TV Receiver Faults

Arising from Improper Placement of Wires and ComponentsBY CYRUS GLICKSTEIN

SYMPTOM POSSIBLE CAUSE REMEDY

1. PICTURE TWISTS even at low levelsof brightness, and contrast.

a) 6.3 v filament wires too close tohorizontal afc coil.

b) Pickup of undesired sigrals in

horizontal hold circuits.

a) Reroute filament wires.

b) Reroute horizontal hold control and/oruse shielded wire for control leads.

2. HORIZONTAL JITTER.Cross -talk between cathode (orgrid) lead of CRT and deflectionyoke cable.

Separate CRT and yoke leads.

3. POOR VERTICAL SYNC and hori-zontal pulling.

Agc plate pulse pickup at grid ofsync separator.

Dress coupling condenser and leads tosync sep. close to chassis, and away fromagc amplifier output circuit.

4. VERTICAL JITTER. Pickup from horizontal circuit.

Move horizontal deflection coil "hot"lead away from vicinity of vert. osc. tube,since it -nay be upsetting vertical trigger-ing.

5. 4.5 MC HASH IN PIX.

a) Radiation from discriminator totuner.

b) Radiaton from volume controllead.

Radiation from hor. output stage.

a) Place shield between discriminator andtuner.

b) Reroute vol. control lead (even ifshielded) away from audio i-f, to minimize 4.5 me pick-up.

6. BARKHAUSEN OSCILLATION (ver-tical line(s) at left side of pix andraster).

Alter hor. drive control setting; changehoriz. output tube; dress antenna inputlead away from horiz. output stage; usemagnet on horiz. output tube.

7. VERTICAL BLACK LINE(S) in pix andraster.

Radiation from deflection yoke.Dress transmission line (or transmissionline link in set) away from deflection yokecable and yoke assembly.

8. PIX SMEAR. Pickup from horizontal circuit.CRT cathode or grid lead too close tohoriz. yoke or horiz. output tube. Sep-arate.

9. HORIZONTAL OUTPUT TRANS-FORMER SQUEALING; raster linesseparate (poor interlace).

Interaction between horiz. yokeand horiz. or vert. oscillator stages,causing waveshape of signal ap-plied to sweep output stage to beimproper.

Dress leads of horiz. deflection coils awayfrom vert. and horiz. osc. stages.

10. INSUFFICIENT WIDTH, keystoneraster, arcing in yoke and/or con-necting wires.

Yoke -connecting leads shorting toeach other or to horizontal sectionof yoke inside yoke assembly.

Check visually and by resistance read -ings. Separate leads from each other andfrom yoke.


Editorially approved by HOWARD SAMS Photofact Reporter*-

Feature "invisible" conversion for over

uVit tan/ ttTV sets with Standard Coil tuners in

use today.

Buy the set owners' goodwill and Icya ty by selling them"invisible" conversion with Standard Coil UHF strips intheir Standard Coil tuner.

Strip conversion is "designed in" conversion developedby the same engineers who designed the turers used intFe sets. And-no extra box, no extra wires, no extrauning knobs-and the absclute min mum of interference.

And Standard Coil "invisible" conversion is simple to nstalland easy to align. Capitalize on the steady demand for UHFconversion. This is all that's needed for each :hannel converted(actual size).

'Vol. 3. No. 2-page 35 and following

glandala--COIL PRODUCTS CO., INC.CHICAGO LOS ANGELES BANGOR, MICH. NO. DIGHTON,MASS.Expor: Agent: Rocke International Corporation, 13 E. 40th Street, New York City


Transistor Service TipsPractical Techniques Used by an Experienced Tech

(The theory of operation of tran-sistors is no longer a novelty. Thepractical handling of these midgetmiracles, however, is still a mysteryto most technicians. The writer gotthe "feel" of transistors from hisown experience.)

Transistor leads, which aremade of very fine wire, have a habitthat is both annoying and damagingto the pocketbook: they will breakoff quite readily, as shown in Fig.1A. Attaching a new wire and ap-plying heat in the time-honoredmanner may be a costly mistake. Itoften results in ruining the transistoraltogether because it destroys thesensitive "whisker" adjustment.

There is a relatively simple way torepair these broken leads, thus pre-serving the transistor for continueduse. The method is illustrated in Fig.1B. First bend the broken transistorto an "L" shape, as shown. Thenwind a spiral of bare copper wire,beginning at the broken lead so that

Fig. 1A-Transistor with broken lead.B-Set-up for safe additions of lead wire.

the starting end of the bare wirehooks around the L -hook on thebroken lead. Introduce the solderthrough the center of the spiralledwire, and apply the iron to the solderby going through a loop in the spiral.Use a hot iron for a very shortperiod. A joint made in this way will

JOSEPH AMOROSE

hold securely although the whiskeradjustment will not have been dis-turbed. The spiralled wire lead maynow be stretched out straight andcut to the desired length.

The technique just described, in-cidentally, is useful for componentsother than transistors. When leadsbreak off close to the body of con-densers, resistors or other compo-nents which are still electricallysound, leads can be added in thismanner without danger of damagingthe parts with excessive heat.

Still better than repairing brokenleads is the technique of preventingthem in the first place. This can bedone quite easily if the tech workingon the transistors happens to be anexperimenter, using them in his owncircuits. An easy and inexpensiveway to protect the miniature devicesand insure prolonged life consists ofhousing them in a small transparentplastic box. Lucite boxes of this kindwhose dimensions are about lx11/2x1/2 in. are readily available at atrifling cost. Most radio supplyhouses use them as containers forsmall parts.

To adapt these boxes for use withtransistors, drill holes through theside of the box, as shown in Fig. 2, toallow the transistor leads to passthrough. Then apply Duco or similar

cement in the holes to hold the wiresin place securely. When the trans-istor is mounted in the box, be surenot to place it too close to the side ofthe box through which its leads will

Fig. 2-Protective housing for transistors.

pass. In this way, if one of the leadsshould break off outside the box,there is sufficient lead length re-maining inside the box so that thereis no chance of ruining the compo-nent for future use. The latter is thecase when a lead break occurs closeto the body of the transistor.

These little boxes are adaptable toholding three transistors each in thefashion described. Protection is pro-vided in more ways than one, sincewear, tear, heat and moisture areall kept out, along with excessivehandling. The advantage of com-pactness is also provided when it isdesired to use two or three trans-istors in a small space.

First TV ReceiverwithWingsThe initial successful demonstra-

tion of television during flight, ac-cording to Sylvania Electric Prod-ucts Inc., was carried out recentlywith a 21 -in. home receiver installedin the lower lounge of a Pan Ameri-can Stratocruiser bound for Ber-muda on a regularly scheduledflight from New York.

The TV flight test was conductedto demonstrate the quality of imagestransmitted from points as far awayas 330 miles, and at altitudes be-tween 15,000 and 19,000 ft.

As many as 12 channels weretuned in during flight from the fol-lowing eight cities: New York, Bos-ton, Philadelphia, Washington, Balti-more, Norfolk, New London and

New Haven. The receiver was suc-cessfully operated from the plane's110 -volt, 400 -cycle supply withoutalterations either to the TV set orthe source.

To pick up signal, about 50 ft.of RG59U transmission line wasstrung through the cable compart-ments to the pilot's compartment,then connected to the plane's re-ceiving and transmitting antenna.

Excellent reception was also re-ported while the plane was on theground. There were no difficultiesfrom electrical equipment, motor in-terference or propeller modulation.Only slight ignition interferencewas noted during take -offs, with nonoise in the sound. Sound volumewas enough to over -ride enginenoise.


New Test EquipmentOscilloscope, Tube Checkers, Voltage Calibrator; Adapters

Senco TUBE CHECKERDesigned to speed the checking of

tube filaments in the new series -con-nected TV sets, this new pocket sizedchecker handles all sizes of tubes, octal,Loctal, 7- and 9- pin miniatures and

5 v. rectifiers. Power is obtained byremoving the standard TV line cordfrom the receiver and plugging it intothe checker. Can also be used as aneon voltage indicator. Service In-struments Co., 422 S. Dearborn St.,Chicago 5, Ill.-TECHNICIAN (Askfor No. 3-24)

al TUBE CHECKERModel 531 tube and battery tester

measures tube quality on both Englishreading and percentage scales in aform of dynamic emission test. Featuresinclude a brass -geared roll chart; 13sockets to accommodate all tubes in-cluding sub -miniatures and acorns;added filament voltages for latest 1/2 v.

to 117 v. tubes; picture tube adapter;1% load resistors and multipliers. Bluesimulated leather case. Size 15 x 131/2x 7 in. overall. $70.00. Chicago Indus-trial Instrument Co., 536 W. Elm St.,Chicago 10, Ill-TECHNICIAN (Ask forNo. 3-33)

NM OSCILLOSCOPEWide -band scope designed especially

for TV servicemen is also recommendedfor industrial applications wheresquare -wave and pulse type signalsmust be observed. Vertical amplifier

response is flat from 10 cps to 4.5 mc,±3db. Four -step frequency -compen-sated vertical attenuator is calibratedfor direct peak -to -peak voltage meas-urement. Sensitivity is .014 v. (rms)linear sweep range 10 cps to 100kc. Average vertical amp. input im-pedance is 2 meg, and 25 mmf. Price-$147.50. Four probe accessory kitavailable at $14.95. Supply Div., NationalRadio Institute, 16th & You Sts., NW,Washington 9, D. C.-TECHNICIAN(Ask for No. 3-43)

Shasta VOLTAGE CALIBRATORCalibrating an oscilloscope is sim-

plified by the Model 402 Square WaveVoltage Calibrator. This instrumentgenerates a square wave with a constantfrequency of 1 kc and an amplitudewhich is continuously varied from 0to 50 v. A display of this signal on anoscilloscope appears as 2 parallel hori-zontal lines, the distance between thelines being equal to the desired voltage.Other signals are then read directly involts by comparison with the calibratorsignals. $75.00. Shasta Div., BeckmanInstruments Inc., P.O. Box 296, Sta. A.,Richmond, Calif.-TECHNICIAN (Askfor No. 3-17)

MORE TECHNICAL INFORMATIONdescribing the new products presentedhere may be obtained by writing oncompany letterhead to New ProductsEditor, TECHNICIAN, 480 LexingtonAve., New York 17, N.Y., listing num-bers given at end of each item of in-terest. Please mention title of positionheld. Please use coupon on page 36.

Vidaire TEST ADAPTERChecking tube socket voltages is

simplified by the new "Adap-Test" lineof test cables. Any standard tube socketsize can be accommodated by 1 of the3 units comprising the AT -K kit.

Model AT -1 is for octal tubes, modelAT -2 for 7 -pin miniature, and modelAT -3 for 9 -pin miniatures. Each unithas test points clearly numbered foreasy identification. Leads are 20 -in.long. Vidaire Electronics Mfg. Corp.,576 W. Merrick Rd., Lynbrook, N. Y.-TECHNICIAN (Ask for No. 3-22)

Tele-Matic CRT BOOSTERModel No. CR-70, "5 in 1" universal

picture tube brightener fits every typeof picture tube through its five posi-tions: series, parallel, electrostatic,electromagnetic and isolation. Flick ofthe switch puts the brightener in seriesor parallel, $3.95. Tele-Matic Indus-tries Inc., 16 Howard Ave., Brooklyn,N. Y.-TECHNICIAN (Ask for No.3-16)

Triplett METERNew 4 -in. panel meter combines a

transparent plastic case with a moldedbase. Case front projects over the rimof the instrument, giving longer scalelength and permitting easier readability.

Available in 2 basic types; dc perma-nent magnet moving coil, and ac ironvane. Triplett Electrical Instr. Co.,Harmon Rd., Bluffton, 0.-TECHNI-CIAN (Ask for No. 3-21)


NEW 1 2AU7A

-shorter construction reducesintermittent scan and heatercathode failures.

-completely interchangeablewith Type 12AU7.

Irt .

IN C. 1

Sylvania makesimportant NEW advances in

CAL BACSix "double -duty" tubes designed to lick TV service'scostliest problems. More to come!

Sylvania's war against callbacks began with the highlyimproved 5U4GB tube. Now Sylvania continues its fightagainst profit -grabbing callbacks and offers five moreimproved types for TV service.

These tubes score a direct hit on the most common"quick failures." Stronger winged -plate design and wafer -stem construction-sturdier welds and glass -to -metal seals;these plus a score of other mechanical and electricalimprovements are incorporated to give trouble -free service.

Join the battle against callbacks! Use only Sylvania"double -duty" types! They're designed for

servicing old as well as new sets.

Look for the new"double -duty" types in this ENOyellow -and -black carton. :t's yourcalling card of quality.

-

sy

REcrPoNicTUBEltltyi

It()

NEW 5U4GB-twin -wing plates provide greater heatdissipation.-wafer stem strengthens construction.Increases ratings to 275 Ma at 44Vdrop with 1.0 amp. peak plate current.

NEW 1 X2B

'or SYLVANIA

-all -nickel plates reduceelectrolysis. Lower gas levelresults in higher breakdownvoltage.-longer life -test underconditions well above ratings.

VA

NEW 61306GTA

-folded -edge plate designavoids bulb bombardment.

-double -clearance betweenmount and bulb top eliminatesthe "pigtail" to grid shorts.Avoids bulb -puncturing electronbombardment.

NEW 1 B3GT

-electrostatic shield -ringprotects filament duringhigh -voltage operation.-Sylvar la -developed top -cap alloy producespositive glass -to -metal seal-high -voltage basemakes tube interchange-able with coated types.

NEW 6SN7GTB

SYLVANIA'UBE

-oblique orientation of sectionsreduces microphoniam.-direct weld between stem pinsand plates strengthens mount.

Sylvania Electric Products Inc.1740 Broadway, New York 19, N.Y.

In Canada: Sylvania Electric (Canada) Ltd.University Tower Bldg., SI. Catherine Street

Montreal. P. 0.

LIGHTING RADIO ELECTRONICS TELEVISION ATOMIC ENERGY


New Components & ToolsCompact CRT Check Tube, Capacitors, Resistors; Hole Cutter

C -D CAPACITORNew STT Midget "Budroc" steatite -

cased paper tubular capacitors range insize from 742 -in. in diameter and 2%6 -in. in length to %-in. in diameter and11/2 -in. in length. Those rated up to400 vdc are impregnated in HT com-pound; those rated at 600 vdc are im-pregnated in Vikane. Both will with-stand wide temperature variations.Cornell-Dubilier Electric Corp., 333Hamilton St., S. Plainfield, N. J.-TECHNICIAN (Ask for No. 3-28)

Clarostat FUSE -RESISTORDual-purpose plug-in fuse -type re-

sistor, "Fuzohm," is designed as a low-cost unit to protect critical and expen-sive electronic equipment, particularlyin TV sets. They repeatedly withstandhigh surge currents without damagebut fuse when surge endangers expen-sive components. Clarostat Mfg. Co.,Dover, N. H.-TECHNICIAN (Ask forNo. 3-26)

Ram FLYBACKSTwo new horizontal output trans-

formers, Models X070 and X116, are re-placement units for Zenith receivers.Features include a unique anti -coronaspray feature, special terminal leaddistribution and high voltage stand-offconstruction. Ram Electronics SalesCo., Irvington -on -Hudson, N. Y.-TECHNICIAN (Ask for No. 3-25)

R & R HOLE CUTTERModel 400 "Dial Saw" will cut any

size hole from 11/2 to 31/2 in. diameterin metals, wood or plastics. Three elec-tronically heat -treated high -speed -steel

cutting blades adjust simultaneously tothe size desired by rotating the dial.The dial is calibrated in standard pipeand conduit sizes, in addition to 1/2 in.spacings. Rust -proof black finish; highalloy shaft, %-in. round, with 3 flatsmilled for chuck mounting. Completewith 3 sets of blades for various ma-terials. $14.95. Robertson & Ruth, Box534, Elmhurst, Ill.-TECHNICIAN (Askfor No. 3-44)

Stackpole CONTROLSLow-cost variable resistor, Type F,

is only % in. in diameter, is especiallysuited for installation in chassis wherespace is limited. Deposited carbon re-sistance element, gold plated ringspring contactor. Shaft has 1/2 in. di-ameter, and comes with either screw-driver slot, fiat, knurl, or plain finish.Available in all resistance ranges,tapers and other specifications accord-ing to RETMA standards. ElectronicComponents Div., Stackpole CarbonCo., St. Mary's, Pa.-TECHNICIAN(Ask for No. 3-32)

Sylvania TEST CRTNew TV receiver check tube, desig-

nated the 5AXP4, is a 5 -in. round,magnetically deflected tube using elec-

trostatic self -focusing. $24.00. SylvaniaElectric Products Inc., 1740 Broadway,N. Y. 19-TECHNICIAN (Ask for No.3-70)

B -M ELECTRICAL TAPEThe vinyl plastic backing on the new

"Behr -cat" line of electrical tape has aparticularly high dielectric strength-over 1,000 v/mil-which, according tothe mfr., makes the tape superior tocombinations of rubber or friction tapesfor electrical applications. Tape is highlyelastic; will stretch 11/2 times its lengthwithout breaking. Withstands acids, al-kalis, water, salt water and oils; highlyresistant to abrasion and corrosion.Available in three models, 7, 10 and 20mils thick. Behr -Manning Corp., 2054Seifert St., Troy, N. Y.-TECHNICIAN(Ask for No. 3-12)


Sprague CAPACITOR KITSDesigned to satisfy the needs of both

large and small service shops, the"Ceramikits" contain the most fre-quently used ratings of capacitors inquantities determined on the basis ofpopularity. The capacitors are pack-aged in clear "Plasti-Pak" boxes andindexed with stand-up file separators.In 2 models; CK-2, which comprises a2 -drawer cabinet and 150 capacitors,and CK-3, a smaller kit which includes75 capacitors. Price, for CK-2-$38.00;for CK-3-$19.25. Sprague Products Co.,65 Marshall St., North Adams, Mass.-TECHNICIAN (Ask for No. 3-31)

Vokar TRANSFORMERSFirst designed for Regency's all -

transistor pocket radio, these new sub-miniature i-f transformers and oscillatorcoils measure only 1/2 -in. cube. The262 kc i-f transformers are enclosedand shielded, and also include a 200mmf. capacitor. The unloaded Q is 80.Mounting leads are designed for dip -soldering. Vokar Corp., 7300 HuronRiver Dr., Dexter, Mich.-TECHNI-CIAN (Ask for No. 3-30)

Aerovox CAPACITORSHeavy-duty ribbed -case of the new

'`Cartwheel" ceramic HV capacitorprovides an extra -long "creepage path,"permits operation at voltages up to 30kvdc. Exclusive potting compound pro-vides insulation resistance greater than50,000 megohms. Power factor is 1.5%max. at 1,000 cps. Standard capacitanceis 500 mmfd., with tolerance of plus50% minus zero. Aerovox Corp., Olean,N. Y.-TECHNICIAN (Ask for No. 3-29)

IDI PHONE PLUGRuggedized phone plug adapter of

molded nylon, designed for the military,is now available for commercial appli-

cations. Plug end of adapter, ModelNo. 1416, is a standard PJ055B insert.Female end accepts twin test prods ofthe standard phone type, or .080 -in.test prods. Industrial Devices Inc.,Edgewater, N. J.-TECHNICIAN (Askfor No. 3-27)

MORE NEW PRODUCTS ON

PAGES 30, 34, 36, 38, 40, 42, 44, 61


At Du Mont there is only one

LY&440(0A

You take no chances with quality whenyou use Du Mont picture tubes. EveryDu Mont picture tube is manufacturedto the same exacting quality standards

EpE

"Trode-marks

- whether it's for a leading televisionreceiver manufacturer to be used asinitial equipment, or for you to be usedas a replacement.

ADVERTISE QUALITY-FOR QUALITY PROFIT!

Look for the Initial Quality

Picture Tube tag packed

with sr ery Du Mont

picture tube. Use it toshow your customers

that you have provided

the finest qualitycomponents with

your service.

Allen B. Du Mont Laboratories, Inc., Clifton, N. J. Replacement Tales, Cathode Roy Tube Divisicn


New Audio EquipmentTuners, Amplifiers, Tape Recorders; Speakers and Enclosures

Bogen HI-FI ENSEMBLE"Nassau" home music system consists

of 2 units, a chairside radio-phono-amplifier cabinet, and the speaker en-closure, which houses a ruggedly con-structed 8 -in. woofer and a separatecompression -horn tweeter. Speaker cab-inet may be located anywhere in theroom. Units incorporated in the systemare: Bogen RR500-1 AM -FM radio-phono chassis and Collaro Model Inter-mix Model 3/532 with G.E. RPX-050variable reluctance magnetic cartridge,with dual sapphire styli. $357.75. DavidBogen Co. Inc., 29 Ninth Ave., N. Y. 14,N. Y.-TECHNICIAN (Ask for No. 3-38)

Pilot PHONOGRAPHHi-fi table model phonograph, Model

PT -1020, "Encore," contains a GarrardRC -80 automatic 3 -speed changer withGE variable reluctance cartridge and a6 -tube push-pull 8 -watt amplifier. Lessthan 1% distortion; 3 step equalization

control for all records. Speaker systemconsists of a heavy-duty 8 -in. wooferand 6 -in. tweeter, enclosed in anacoustic chamber. Mahogany finishedcabinet. $179.50. Pilot Radio Corp., 37-06 -36th St., Long Island City, N. Y.-TECHNICIAN (Ask for No. 3-34)

TRI RECORDERFull fidelity tape player and recorder,

the "TriFy Continental," features aplug-in recording head, exclusive tapeguide slotting device, neon bulb record-ing level indicator, pre -equalized am-plifier, and 5 x 7 in. speaker. Also in-cludes a 6 -tube superhet radio, withfull 540-1600 kc broadcast coverage, anda special mixer circuit which permitsrecording of both the microphone andradio at the same time. $169.95. TapeRecorders Inc., 1501 W. Congress St.,Chicago 7, M.-TECHNICIAN (Ask forNo. 3-5)

Webster TAPE MECHANISMNew addition to the "Ekotape" line

of custom tape recorder mechanisms,Model 221 "Symphotone," consists of2 -speed record -playback mechanismfinished in antique copper and brushedchrome plate. Plays and records at33/4 and 71/2 ips. with twin track re-cording head. Response is 40 to 13,000cps at the 71/2 ips speed. Two inputs,for mike and phono or tuner. Two in-dicator kits-a db meter and a "magiceye" tube-are available as accessories.Sound Sales Div., Webster Electric Co.,1900 Clark St., Racine, Wis.-TECH-NICIAN (Ask for No. 3-36)

Hartley ENCLOSURENew design in a non -resonant en-

closure for use with the Hartley 215speaker has a 2 -stage acoustic filterand measures 18 x 18 x 16 in. Un-

fimsned gunmood, sanded ready forstaining or painting. Price-$50.75; withspeaker-$115.75. H. A. Hartley Co. Inc.,521 E. 162nd St., N. Y.-TECHNICIAN(Ask for No. 3-35)

Approved FM TUNER KITFeatures of the new V-9 FM kit are

the self-contained ac power supply,200 kc band width, 2 limiters and dis-criminator, 10 wv sensitivity with 20db of quieting, and tuned r -f stage.$29.50. Approved Electronic Instr. Corp.,928 Broadway, N. Y. 10.-TECHNICIAN(Ask for No. 3-7)


Regency HI -Fl CABINETSFlexible line of cabinets enables dealersand technicians to assemble customer'schoice of company's audio componentsinto packaged units. Price range ofthree units is $17.50 to $85.55, with aux-

iliary panels priced around $5. Tablemodel TM is for Regency HF 80 or HF150 amplifiers. Model TMC also accom-modates record changer, and amplifieror AF 220 tuner. Model CTC is adapt-able to any Regency amplifier or tuner,and any standard record changer. Re-gency, Div. of IDEA, 7900 PendletonPike, Indianapolis 25, Ind.-TECHNI-CIAN (Ask for No. 2-29)

Argos CABINETSSmall size console speaker cabinet

is designed and licensed to use theJenson "Duette" principle, which isclaimed to get double the use out ofthe internal air mass. Available in

either mahogany or blonde leatherette,in 2 models: AD -1 rectangular model,at $21.50, and Model AD -2, cornermodel, at $24.50. Argos Products Co.,4753 N. Broadway, Chicago 40, Ill.-TECHNICIAN (Ask for No. 3-42)


"Everywhere! Even in the most extreme fringe areas, the sensationalWinegard Interceptors are providing clear, enjoyable TV pictures."

Wilmington,Del.

"first shipmentof Interceptors

and Pixiesenthusiastically

occlaimedby our dealers.

Advertisingclaims well founded.

wrlloutperformo stocked

conical ... oftentimesat o

much lowereight.Interceptor

better thoPixie n anythingwe hove

run up ogcinst includinglarge colineor

arrays."

DELAWAREELECTRONICS

SUPPLYCO.

A great new antennathat gives you both

Complete all -channel VHF coverage_

2.Brilliant yagi performance --Yes, the extraordinary high gain of a yagi . . .

The pin -point directivity of a yagi . . .

Not on just one channel-not on just one bandbut clear across the whole VHF spectrum.

The Interceptor is designedfor both black and white and colorThe same Interceptor that gives you those sharp, clearblack and white pictures today will give you the truest,brightest color pictures imaginable in the future.NOTE- The Interceptor has been received so enthusiastically

. all over the country ... that the Winegard Company, evenwith around the clock production in its brand new plant,can't seem to make Interceptors fast enough. Twice thisseason production has been actually doubled over what wasoriginally planned, and still we are experiencing difficulty inkeeping up with this tremendous demand. So, get your orderin now - and avoid disappointment on delivery.

1.

List price U.S.A.... Interceptor ... per bay...$2495(Stacking bars available)

016, MIN 11.MI 1MM

IMP-Model L-7 for channels 7-13.On the high VHF band, the IMPfunctions as two high gain yagi-operating side by side in perfectphase, to give gain and directivityfar in excess of more conventional7-13 broad hand designs.

Imp Features: Exceptionally high gain on channels 7 13. Full wave driven elements. Full wave reflector elements. Electro-Lens Focusing.*

Note --the IMP makes the perfect all -channel atticantenna for alt channels in primary areas.List price U.S.A.... Imp.... per bay(Stacking bars available)

PATENT PENDING

'1295

AN

fi eports like thesefrom across the nation

are pouring in, testifying tothe ex:eptional performance

of our antennas

o,

Exclusive!Electro-Lens Focusing !*

more gain ! Super 'Ceptor(Super Interceptor)

A NEW more powerful version of our famousWinegard Interceptor-Now-makes it pos-

sible to have multi -element yagiperformance on all channels int:ie most extreme fringe areas.

The Super 'Ceptor possessesad of the wonderful features oft le Interceptor, but with muchincreased sensitivity . . . lip to22C/, more gain. over the stand-ard Interceptor model.

Features of the nterceptor and Super 'Ceptor Excellent 3(0 ohm impedance match over

the entire VHF range. Extremely marrow yagi type forward lobes,

with no side lobes and negligible rear lobes. Single lead . . no switching . . . no inter-

action between the high channel elementsand th.e low band elements.

The New Winegard Super 'Ceptor(Super Interceptor)

With Illectro-Lens Focusing 1*Gives you-multi-element yagi performance,not on one channel . . . not on one band . .

but on every single channel in the wholeVHF spectrum!List price U.S.A.. - Super 'Ceptor ... per boy ,3495(Stacking bars available)

=1

THE PIXIETop all channel performance-at a lowprice-featuring unique improved coni-cal type driven element-for high gainand uni- lobe directivity.List price U.S.A.... PIXIE ... per bay $14

95(Stacking bars available)

See your jobber or write us for additional information about theInterceptor and other Winegard antennas

WINEGARD COMPANY3000 SCOTTEN BOULEVARD, BURLINGTON, IOWA

Winegard-America's most wanted line of TV antennas- designed to make installations quicker- easier -and more profitable


Antennas & Related ItemsHigh Gain Outdoor Types; Tunable Indoor Antenna; Accessories

JFD VHF -UHF ANTENNAThe reverse -phase multiplex dipole

system employed in the new "Fireball"antenna permits dual operation of allelements for channels 2 through 13.Wide spaced booster and parasitic ele-

ments assure maximum signal pick-upon all channels. Over -sized folded di-pole cuts interference and multipliesthe signal strength. Assembly is speededby new "Hi -Tension" brackets whichhold elements in place without use ofscrews or bolts. Price, for single baymodel (No. FB500), $14.95; stacked,(No. FB500S), $31.90. JFD Mfg. Co.Inc., 601 -16th Ave., Brooklyn, N. Y.-TECHNICIAN (Ask for No. 3-10)

Dage COAX CONNECTORS"DM" series of weatherproof coax

connectors is one-half the size of thestandard BNC type. Designed for usewith miniature cables up to No -fn. indiameter. Silver plated brass conduc-tors, teflon insulation, and siliconegasketing for operation at extreme tem-peratures. Positive lock, quick discon-nect coupling. Dage Electric Co., Inc.,Beech Grove, Ind.-TECHNICIAN(Ask for No. 3-3)

Vee-D-X VHF ANTENNANew "VeeDXer" all channel VHF

antenna is an 18 -element yagi com-posite combining a half -wave broad-band yagi on the low band with a fullwave broadband yagi on the high band.The system is phased together with theexclusive "dyna-phase" system. Full

wave design for the high channels issaid to equal the gain directivity andfront -to -back ratio of a single channel10 -element yagi. All -aluminum, pre -assembled construction. LaPointe Elec-tronics Inc., 155 W. Main St., Rockville,Conn.-TECHNICIAN (Ask for No. 3-2)

Neal YAGI ANTENNASThe -Fringe Beam" line of 5- and 10 -

element yagi antennas are designed forthe VHF band. Extra rugged construc-tion; heavy gauge plated steel elementclamps. Boom is 1 -in. seamless alumi-num. Step-up type transformer dipoleprovides excellent 300 ohm match; full6 me bandwidth. Gain of 10 -elementyagi is approximately 10 db. NealElectronic Co., Inc., P.O. Box 376,Huntsville, Ala.-TECHNICIAN (Askfor No. 3-9)

FOR MORE TECHNICAL INFORMATION ON NEW PRODUCTS OR BULLETINSuse this convenient coupon. Enter below the reference numbers for all time desired.

New Products EditorTECHNICIAN & Circuit Digests480 Lexington Ave.New York 17, N. Y.

Please send me more information on this following items:

My company letterhead or business card Is 11111C101414Name

Firm My position

Business address lif different from abeam)

Address

City Nate

TENtenna ANTENNA"No -Ghost" Model T-100, for b&w, or

color TV, and FM radio, operates in-dependently as an indoor antenna orin conjunction with roof or existingantenna. Contains 10 variable tuning

circuits, with a calibrated visual in-dicator. Twin dipoles of "Ceroc" wirespool off to the required length, andare secured behind the receiver by 2suction cups. $7.95. TENtenna Inc., 122E. 42nd St., N. Y. 17, N. Y.-TECH-NICIAN (Ask for No. 3-15)

Federal TVI FILTERTelevision interference caused by

auto ignition system, medical diathermy,ham radio transmitters and similarsources is suppressed by the "3 -Pi"TVI filter. Features include printedcircuit construction and durable, trans-parent polystyrene plastic case. Attenu-ation provided by the "3 -Pi" is inexcess of 46 db, which, according tothe mfr., is far superior to existingitems on the market. Federal Elec-tronics, Federal Electronics Bldg., Rock-ville Centre, N. Y.-TECHNICIAN (Askfor No. 3-11)

Radian ARRESTORAll standard types of 300 ohm twin

lead-open, jumbo, flat or tubular-canbe handled by the new LA75 lightningarrestor. Utilizes sparkgap, resistor cir-cuit, and exclusive ground wire grip.UL approved for both outdoor and in-door use. Radical twin lead grip isclaimed to make installations fasterand easier. Price, including mountingstrap and hardware-$1.35. The Ra-dion Corp., 1130 W. Wisconsin Ave.,Chicago 14, Ill.-TECHNICIAN (Askfor No. 3-14)


Pages 30, 32, 34, 38, 40, 42, 44, 61


ociasoozooss

tArkt.1.011`(APPROVED PRECISION

PRODUCTS

,ucis

Fp 3

APPROVED P

MACAPPROV

ID PRECISIONPRODUCTS

tillALLORI..010:1313'

APPROVEDPRECISION

PRODU

WIALLOINAPPROVED

PRECISIONPRODUC1S ALLORN(IsA ECISION

P0.0

DUC15

APPROVEDPR

On electrolytics

FP meansMALLORY!Look for the two names-Mallory and FP-on the electrolytic capacitors you buy.They're your assurance of getting thegenuine FP design, offering an exclusivecombination of Mallory -developed features.

Famous for long life on the shelf and inservice, they have true fabricated plateanodes ... have been built for years tooperate dependably at 85° C (185° F).

FP's handle high ripple currents. They'reideal for voltage doubler applications andfor selenium rectifier circuits. Their twistprong mounting cuts installation timeto seconds.

Don't accept substitutes. Alwaysspecify Mallory FP Capacitors tobe sure of premium performanceat no extra price.

BE SURE TO USE ...

Mallory PlascapsK . . . plastictubular replacements %silk per-manently secured leads ... won'tshort out or open prematurely.

Subminiature Silverlytie* Capac-itors . . . only %" long and 7,12"in diameter ... ideal for trap.sistors and other miniature low.voltage circuits.

Trademark

MALLORYCAPACITORS CONTROLS VIBRATORS SWITCHES RESISTORSRECTIFIERS POWER SUPPLIES FIVERS MERCURY BATTERIES

APPROVED PRECISION PRODUCTSP. R. MALLORY a CO. Inc., INDIANAPOLIS 6, INDIANA

APPROVEDPRECISION

PRODUCTS

4111110

ISA PS II0RfAPPROVED PRECISION

PRODUCTS

Antennas & AccessoriesOutdoor VHF, UHF & FM Antennas; Line Tap -Off; Mast Mount

Winegard VHF ANTENNADesigned for difficult and extreme

fringe area operation, the new "Super'Ceptor" Model SL -4 is designed to givemulti -element yagi performance on all12 VHF channels. Features include the

patented "Electro-Lens Focusing" andthe use of Modified Tee matched drivenelements so phased that they reinforcesignals arriving from the front of theantenna and cancel signals from backand sides. Uniform gain characteristics;high signal-to-noise ratio. WinegardCo., 3000 Scotten Blvd., Burlington, Ia.-TECHNICIAN (Ask for No. 3-71)

B -T TAP -OFFS

Model MTO-11 tap -off for communitysystems and the Model MTO-59 forindoor use feature air dielectric insula-tion to minimize shunt capacitance.They provide uniform 17 db r -f insula-tion and positive electrical protectionthrough a spring contact resistor -capa-citor network. Weatherproof MTO-11handles RG-11/U through line, and hasa clamp for a messenger cable: tap -offfits RG-159/U. MTO-59 taps into RG-59/U. A wall outlet plate and an RG-59/U receptacle are included. Price, foreach-$7.00. Blonder -Tongue Labs Inc.,526 North Ave., Westfield, N.J.-TECH-NICIAN (Ask for No. 3-84)

Acme PULSE TRANSFORMERSTwo types of miniature pulse trans-

formers have been especially designedfor triggering and counting circuits andde isolation, inversion pulse shaping,and pulse transmission circuits. Onegroup, comprising models 1C, 2C and3C, has the core and coil assemblymounted within a metal housing withmultiple terminal header plates of im-proved glass seal type. The other group,1E, 2E and 3E, has the core encapsu-lated and sealed within a molded im-proved epoxy resin. Acme ElectricCorp., 1375 W. Jefferson Blvd., LosAngeles, Calif.-TECHNICIAN (Askfor No. 3-78)

Snyder FM ANTENNASFour new FM antennas, the "S"

Model, the "X" Model, the "Ultimate"and the "Directronic" cover all condi-tions of FM reception. Model "S" is arigidly constructed omni-directional

tenna for metropolitan areas. Model"X", also omni directional, is for metro-politan and suburban areas. It consistsof crossed folded dipoles. The "Ulti-mate" is of a yagi-type construction andis designed for fringe area operation.High gain; low front -to -back ratio. The"Directronic" is constructed to givemaximum reception in suburban andfringe areas. No orientation needed.Six -position switch selects combinationof elements which provide best recep-tion. Snyder Mfg. Co., 22nd & OntarioSt., Phila., Pa.-TECHNICIAN (Ask forNo. 3-75)

Alliance DOOR OPENERNew "Lift-A-Dor" line of electrical

and radio -controlled garage door open-ers consists of 7 models designed to fitall the popular types of overhead doorsMost elaborate type, Genie Model A,is a completely automatic, radio -controlled model which opens andcloses the door, turns the light on andoff, locks and unlocks the door. It isoperated from the dash of the car.Prices range from $69.95 for the GenieModel KST-1, a key lock straight track.to $219.95 for the Genie Model A des-cribed above. Alliance Mfg. Co., 100Lake Pk. Blvd, Alliance, 0.-TECH-NICIAN (Ask for No. 3-69)


Ward OUTDOOR ANTENNAThe new "Invader" antenna, designed

to operate in fringe areas in a VHFrange and in primary signal areas in aUHF range, is a flat type inline yagi.It features a new snap lock bracket

which is claimed to eliminate the possi-bility of intermittent contact. Requiresonly 29 in. of stacking. Available in 4 -bay stacking kit, model TV -357, and ina 2 -bay version with stacking harness,Model TV -356. Price for the TV -356is $39.95. Ward Products Corp., div. ofthe Gabriel Co., 1148 Euclid Ave.,Cleveland 25, Ohio.-TECHNICIAN(Ask for No. 3-13)

Telco MAST MOUNTVersatile "Handy Mount," mast

mount, designed for use on any rooftopinstallation, comes completely pre -assembled and has a double supportfeature to give it extra strength. Fitsany size mast up to 11/2 -in. diameter.

Clamp and U -bolt construction givesthe device all -angle versatility. Anextra leg provides solid support fromboth sides. 55e. Television HardwareMfg. Co., div. of General Cement Mfg.Co., 919 Taylor Ave., Rockford, Ill.-TECHNICIAN (Ask for No. 3-68)


PAGES 30, 32, 34, 36, 40, 42, 44, 61


Nationwide Sales ContestTrips to Bermuda on the Furness

Line's "Queen of Bermuda" are thegrand prizes in Jersey SpecialtyCo.'s new "Time of Your Life" vaca-tion contest being launched thismonth. Several hundred worth-while prizes will also be awarded toothers showing meritorious effort inthe sales activity.

The prizes are being awarded forthe best letters from dealers on TVwire installation techniques. Thewinning letter takes one grandaward, with the others going to thedistributor and the distributor'ssalesman contacting the dealer. Twotrips to Bermuda are awarded toeach.

An interesting highlight of thecontest is the awarding to each ofthe first 5,000 entries of a 100 ft. coilof 20 gauge, 80 mil -web, pure poly-ethylene lead-in wire.

All inquiries regarding the "Timeof Your Life" contest should be di-rected to the Contest Manager, Jer-sey Specialty Co. Inc., BurgessPlace, Mountain View, N.J.

Milestone For PublicationOn March 1, Sylvania commemo-

rates the 25th anniversary of its"Sylvania News," the service -dealerpublication published by the com-pany's renewal tube sales depart-ment. It is the oldest continuousservice -dealer publication within theelectronics industry.

First published on March 1, 1930,with a circulation of 30,000, the"News" now reaches more than 130,-000 readers all over the world.

Featured in the "Sylvania News"are technical articles in the radio,TV and electronic fields, practicalinformation for the service dealer,news of the industry, and technicalinserts which will become part of theSylvania Technical Manual-now inits 9th edition.

Motor Capacitor GuideTechnicians eager to expand their

business to allied fields will find anew catalog release from AerovoxCorp., New Bedford, Mass., particu-larly interesting. Entitled "Catalogand Replacement Guide-AC Ca-pacitors," this comprehensive 35 -page report gives detailed technicalinformation on electrolytic motorstarting capacitors.

The catalog lists typical capacitorratings for capacitor start motors,with formulas for calculating ca-pacity, current and power factors.Included are wiring diagrams forcapacitor motors and a graph show-ing the electrical characteristics of110 v. starting capacitors at 60 cps.

for servicing colorYOU NEED

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lightweight ...just what you need for those money -making :louse

MODEL 617 3" OSCILLOSCOPEDesigned both for color TV servicing ani

laboratory requirements. Features highdeflection sensitivity (.01 v/ir.. rms);

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MODEL 614 VTVMConv7.-nience at unprecedented low costsums up this rugged, service ibleinstrument. Hycon plus featu-es include:21 ranges 128 with p -p scales); large61/2" meter; 3% accuracy on DC and ohms,5% cn AC. AC frequency responseto 25) MC (with accessory crystal probe).AND TEST PROBES STOWINSIDE CASE, READYTO USE.

MODEL 615 DIGITAL VTVMIdeal for production -line testing

and the laboratory, this new VTVMgives direct readings, without

interpolation. Features illuminateddigital scale with decimal point and

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New Sound EquipmentCartridges, Amplifiers, Speaker Systems; Hi-Fi Accessories

GE FILTERNew hi -fidelity "Three -Way Record

Filter," Model A1-901, designed for sys-tems using the GE variable reluctanceor similar cartridges, combines two in-dependent filter controls and one com-pensator control in a single unit. Itconsists of a low frequency cutoff filter,a record compensator and a high fre-quency cutoff filter. The record com-pensator adapts individual systems toeach of the six commonly used record-ing curves. Dimensions, including cabi-net, 71/2 x 31/2 x 31/2 in. $19.95. Radio& TV Dept., General Electric Co. Inc.,Syracuse, N. Y.-TECHNICIAN (Askfor No. 3-76)

A -L HI -Ft AMPLIFIERSModel A -440A, a self -powered pre-

amplifier -control unit, has two lowlevel and three high level inputs withindividual gain controls, selection foreither conventional volume or loudnesscontrol, and choice of 25 recordingcharacteristics. Also incorporates exclu-sive tape monitoring feature. Hingeddoor hides all controls except the on -off volume control. Companion poweramplifier, Model A -340A, 35 watts, hasa response ± 1 db from 5 to 100,000cps. Variable output impedance andgain control. Utilizes 6550's in push-pull output. Altec-Lansing Corp., 161Sixth Ave., N. Y. 13-TECHNICIAN(Ask for No. 3-72)

Fenton PORTABLE SPEAKERDesigned for simultaneous listening in

different rooms or stereophonic setups,the Fen -Tone extension speaker in-cludes a Jenson 5 -in. speaker and 25

ft. of extension cord. Available in 6satin -finish colors. Equipped with itsown baffle, stand and switch. $11.90.Fenton Co., 15 Moore St., N. Y. 4, N. Y.-TECHNICIAN (Ask for No. 3-37)

Recoton CARTRIDGEMagnetic turnover cartridge, Model

500, features a frequency response of20 to 16,000 cps, high compliance andlow mass, replaceable stylii, diamondor sapphire, and extra shielding. Newpush-pull coil assembly is claimed toeliminate hum pickup from changermotor, or transformers. $9.90. RecotonCorp., 147 W. 22nd St., N.Y. 11, N.Y.-TECHNICIAN (Ask for No. 3-6)

FME TAPE RECORDERTwo -speed, dual -track tape recorder,

Model 37C, is an improved version ofthe earlier 37B. Improvements includethe use of a 2 -belt system to eliminatethe possibility of wear or squeal andseveral circuit modifications to providegreater fidelity of tone. Externalchanges include an attractive 2 -tone

gray color scheme and redesigned con-trol knobs. $139.95. Federal Mfg. andEngrg. Corp., 211 Steuben St., Brooklyn,N. Y.-TECHNICIAN (Ask for No.3-66)

Magnavox HI-FI PHONOConsole model hi -fidelity phonograph,

the "Magnasonic 210," has a 10 -wattpush-pull amplifier, a 12 -in. woofer and5 -in. tweeter. Changer is 3 -speed, auto-matic, with dual sapphire styli. Cabinetis available in either russet or blondMagnatex. $149.50. The Magnavox Co.,Fort Wayne 4, Ind.-TECHNICIAN(Ask for No. 3-39)

MORE TECHNICAL INFORMATIONdescribing the new products presentedhere may be obtained by writing oncompany letterhead to New ProductsEditor, TECHNICIAN, 480 LexingtonAve., New York 17, N.Y., listing num-bers given at end of each item, of in-terest. Please mention title of positionheld. Please use coupon on page 36.

Hallicrafter RECEIVERSModel SX-96 is a 10 -tube double con-

version selectable side band communi-cations receiver which covers the stan-dard broadcast band from 538 to 1580kc and 3 SW bands, from 1720 kc to 34

mc. Features include calibrated band -spread, "S" meter, low drift and fivesteps of selectivity.

Model SX-99, shown, covers the rangefrom 1680 kc to 34 mc. Over 1000 de-grees of calibrated bandspread over the10, 11, 15, 20, 40 and 80 meter bands,Crystal filter, antenna trimmer, "S"meter, 1 r -f and 2 i-f stages. Price-forthe SX-96, $249.95; for the SX-99,$149.95. Hallicrafters Co., 4401 W. 5thAve., Chicago-TECHNICIAN (Ask forNo. 3-83)

National SPEAKER SYSTEMSRecent additions to the "Horizon" line

of hi-fi components are the National"Catenoid," a 4 -way corner horn withcross over network, the "Copley," a3 -way corner system, the "Wellesley,"a deluxe version of the "Copley," andthe "Fantasia," an end table type withdual speakers and wrought iron legs.All models are available in blonde, ma-hogany and walnut, both hand rubbedand Formica. The National Co., 61Sherman St., Malden, Mass.-TECH-NICIAN (Ask for No. 3-67)

Astatic CARTRIDGESTrue tone, smooth response and a

marked absence of needle talk areclaimed for the new 66 and 68 Seriescrystal pickup cartridges. Feature ofconstruction is the new high compliance"K" needle. Cartridges are available inboth single needle and double -needleturnover models. 66 Series have a 3.0 v.output and 68 Series a 4.0 v. output.Housings are stamped aluminum, andterminals are quick -disconnect type.Crystal elements have moisture -proofcoating. Astatic Corp., Conneaut, O.-TECHNICIAN (Ask for No. 3-77)


Magnetic Indoor AntennaA new magnetic material is the

heart of a compact, cabinet -enclosed,permeability tuned indoor antennaannounced by Brach Mfg. Co. (Div.of General Bronze Corp.)

Most interesting feature, techni-cally, is the use of electromagneticrather than electrostatic means forpicking up signals. In this respect,Brach engineer Ira Kamen com-pared it to preceding types as oldlong-wire antennas may be com-pared to ferrite -core miniature re-ceptors.

Housed in a cabinet 14 in. long and4 in. high, the unit can sit on top ofa TV set without contributing anunsightly appearance. A channel -calibrated slide -rule dial and a tun-ing knob give it the appearance of asmall table radio. They also make forsimplified adjustment. The unit doesnot have to be oriented. Perform-ance is stated to at least equal thatof any indoor type. The unit retailsfor $19.95.

Possibilities for future antennadevelopments based on the new ma-terial were said to include: (1) useof the present design by receivermanufacturers to incorporate built-in antennas that will give good re-sults in a large number of installa-tions, (2) easy adaptibility of thepresent model to UHF reception, and(3) design of multi -unit antennas ofsmall size for use in attics or onrooftops in fringe and ultra -fringeareas.

While antenna design parametersfor the new material are completelydifferent from present formulas, nodesign limits were foreseen.

"Well, who shall we visit tonight, dear", TheJohnsons, the Goulds or the Pennypackers'''

Rea byyou get

EXACT -DUPLICATE TV REPLACEMENTS

with AER011011TWIST -PRONG ELECTROLYTICS

Because Aerovo offe-s the cutstarding listings of to ist-pron7,e ectrolytics - 80 singles, 132 duals, 280 triples,234 quads - all addirg up to 726 different numbers

These are all standard numbers. Ali are listed.All are available in a hurry f-om your Aerovox distribibr.

And it's easier, quicker, surer, mor! 3rofirable, to pic.4 the right number.The Aerovox numbering system is sure-fire: first digi: ndicatesnumber of sect ons, followed by numerals for catalog number. Listingsarranged by singles, duals, triples, quads; capacitance;, voltages. sizes.

Of course all Aerovo) Type AFH twist -prong electrolytics offerthe latest refinements - 85° C. opxration improved hermetic sealing;Sturdy terminals and nounting prongs; hi -purity alumir um througiout.

DON'T IMPROVISE! To save time, effort, mone.,,make full use of the outstanding Ae-ovox listings.It doesn't pay to try makeshifts with odd value!.Ask your Aerovox distributor for latest AFH listings.

AEROVOX CORPORATIONfRovax

C-fi3p8EitorsDISTRIBUTOR SALES DIVISION,

NEW BEDFORD, MASS.

In Canada: AEROVOX CANADA, LTD., Hamilton, Ont.Export Ad Ayr rna. 89 Brood St, New Yo Y, N Y Coble Auriemo, N. Y. "


Test Instruments & ToolsVTVM, Tube Checker, Signal Tracer; Geiger Counter

EIce SIGNAL TRACERDeluxe multi -signal tracer Model 147,

for r -f, i-f and audio signal tracing,and trouble -shooting in AM, FM andTV sets, has separate high gain r -fand low gain audio input channels. In-

corporates a built-in 5 -in. test speakerand magic eye. Exceptionally high r -fsensitivity. Added features include aspecial Noise Locator Circuit, and acalibrated wattmeter which reveals ab-normal wattage consumption in setsunder test. Price, in kit form-$24.95;factory wired,-$39.95. Electronic In-strument Co., Inc., 84 Withers St.,Brooklyn 11, N. Y.-TECHNICIAN(Ask for No. 3-18)

Drake SOLDERING KITNew soldering Id+ consists of three

irons which fit into a single handleassembly. Medium -heavy duty modelis 150 -watt iron, with 11/4 -in. tip. Lightduty iron is 100 -watts, with 3/4 -in. tip.Smallest, a 60 -watt iron, with 1/4 -in.tip, is for hobby work. Outfit is con-tained in an all -steel tool kit, andincludes safety stand and 2 tubes ofDrake solder-acid and rosin core$15.95. Drake Electric Works Inc., 3656Lincoln Ave., Chicago 13-TECHNI-CIAN (Ask for No. 3-79)

EMC TEST EQUIPMENTThree precision instruments are be-

ing offered together as a package inthe new "Basic Service Shop TestEquipment" offer. The units are theModel 106 vtvm, Model 500 r -f signalgenerator, and the Model 208 tubetester. Included without extra chargeare the Model CRA picture tubeadapter, for the Model 208, and 2 ModelIS "Eye Level" instrument stands. To-gether, the equipment provides all themeasurements necessary for basicradio and TV receiver servicing.Total cost-with Models 106 and 500in kit form, $68.55; with all unitsfactory wired, $90.55. Electronic Meas-urements Corp., 280 Lafayette St., N. Y.-TECHNICIAN (Ask for No. 3-19)

Precision VTVMAdvanced features in the new Model

88 wide -range VTVM-ohmmeter in-clude special peak -to -peak voltageranges. The meter provides 7 distinctlyseparate functions with 40 ranges. In-

-

eludes all -zero center dc vtvm with 6overlapping 0 -center de ranges fromplus to minus 1.2 v to ± 1200 v. Ohm-meter covers range of resistance valuesfrom 0 to 1000 megohms; reads 10 ohmscenter scale on R x 1 range. High fre-quency vacuum tube prole is availableas an accessory and provides high fre-quency ac-rms reading facility to 300mc. Price, complete with battery, andcoaxial vtvm probe, $69.75. PrecisionApparatus Co., Inc., 70-31 84th St.,Glendale 27, N.Y.-TECHNICIAN (Askfor No. 3-80)

III TESTERModel HC Tester permits continuity

measurements, insulation resistancetests, dielectric strength tests and theuse of external instruments on cableharnesses in airplanes, electronic as-semblies and communications equip-ment. Two colored lights serve as in-dicators for continuity testing, andmeters are provided for Lo -Rangeohmeter, insulation resistance measure-ment and dielectric breakdown test.Dielectric breakdown and insulation re-sistance test of up to 1500 vdc are avail-able. Industrial Instruments Inc., 89Commerce Rd., Cedar Grove, N. J.-TECHNICIAN (Ask for No. 3-20)


Knight TUBE TESTER KITLow cost tube tester kit for the TV

service shop measures tube perform-ance by the cathode emission methodand checks for shorted elements, openelements and heater continuity. Han-

dles all sizes of tubes, and, with specialadapter, all types of picture tubes. Fea-tures 41/2 -in. meter, line voltage com-pensator, and clearly marked roll chart.Single -unit, 10 -lever function switch.Price, with counter -type case, $29.75;in portable carrying case, $34.75. AlliedRadio Corp., 100 N. Western Ave., Chi-cago 80, 111.-TECHNICIAN (Ask forNo. 3-73)

Nucleonic GEIGER COUNTERUranium Ore-Lokator Model RM2N

has a sensitivity of .02 milliroentgens/hr. and is sensitive to as little as .003%uranium. It detects and measures theintensity of hard beta and/or gammaradiation. Large 21/2 -in. meter is cali-brated to read radiation from 0 to 25-2.5-25 milliroentgens/hr. and countsfrom 500 to 5,000-50,000 counts per min-ute. A neon panel light is provided toindicate when the instrument is turned

on and also provides a flashing signalin response to radiation. An audiblesignal is provided by clicks in the head-phone. Models vary in price from $24.95to $149.50. Nucleonic Co. of America,497 Union St., Brooklyn, N.Y.-TECH-NICIAN (Ask for No. 3-4)


PAGES 30, 32, 34, 36, 38, 40, 44, 61


1954 1955

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB

* As filed with the Audit Bureau of Circulations subject toaudit.

t See ABC audit, paragraph 28a, for an official explanationof cutbacks.

Pub ,her rnote_-

0' ABC rs,,,d

UP!UP!

UP!goes the paidcirculation ofTECHNICIAN

As of February, 1955:

47,672 PAID SUBSCRIPTIONS ON HAND50,000 AUDITED TOTAL CIRCULATION94% OF PAID SUBSCRIPTIONS GO TO

SERVICE OUTLETS

-greatest success ever scored by a tv-electronicservice publication.

-main circulation goal reached at start ofsecond calendar year.

Find out for yourself °pout TECHNICIAN'S overwhelm-ing preference -120% over the second publication ascertified by Ross Federal Research Corporation.

And here is an unprecedented challenge: Have youradvertising agency poll all the servicemen in a city orcities of your choice, at our expense. First, write usfor details.

CALDWELL-CLEMENTS, INC.480 Lexington Avenue, New York 17, N. Y.

Telephone Plaza 9-7880

LARGEST AUDITED PAID CIRCULATION AMONG SERVICEMENTECHNICIAN March, 1955 43

Speeding Up SolderingSuggestions From Readers on How to Do Difficult Jobs Faster

Soldering in Tight PlacesIn cramped quarters, it is often

desirable to use just enough solderto do the job and no more, sinceany excess may, sooner or later,form a hard -to -remove short-cir-cuit. A minimum of solder may beapplied in such areas as follows: Asmall ball of solder is melted on atable top, or on a junk block ofwood; an ice pick or similar tool istouched to it before it solidifies. Theball of solder will stick to this tool,permitting exactly that amount tobe transferred later to the place de-sired. The wires to be joined areheated until they become hotterthan soldering temperature. Thejoint is then touched with the pre-formed solder ball. The beauty ofthis method is that you can regulatethe exact amount of solder going toa joint in a ticklish place, say a coilterminal, where splashes or excesssolder would be difficult to remove.Obviously, the separate wires tobe joined have already been tinned,either in the manner described orby more conventional methods, be-fore the soldering operation.-JamesMcRoberts, Brooklyn, N.Y.

Soldering Aluminum PartsSoldering an aluminum portion of

an electronic device can be accom-plished quickly and efficiently witha regulation soldering iron and or-dinary solder, by first melting ablob of solder at the site of the re-pair. While keeping the metal hotenough so that the blob of solderremains molten, scrub the solderonto the aluminum surface with apad of steel wool. Then tin the sur-face, after which solder will adhereto the aluminum as well as it willto other metals.-Harvey Miller,Sarasota, Fla.

Flexible ViseIn assembling small units or many

components, we've often found thiswork easier by clamping or stickingthem in a wad of children's modelingclay during the soldering process.The clay can be shaped firmly tohold any irregular pieces, does notconduct away or dissipate the heat,and is firm enough to stay put underthe soldering iron.-Stanley Clark,Box 222, East Bradenton, Fla.

Solder Flux CautionsMany technicians are apt, on occa-

sion, to resort to the use of somepatented soldering flux, in order tomake a soldering job easier-espe-cially in the case of aged radio andtelevision sets, where the wires areold and have an oxidized coating.Where high voltages are present-particularly in the vicinity of lowor high -voltage rectifiers-solderingflux should never be used. Nodamage may be evident for a fewdays; when the high voltage haseaten its way through the flux, andacross a Bakelite socket to ground,however, the wires or Bakelitesocket will smoke, and a tough jobis on the way, replacing wires andsockets. I have had to replace sev-eral sockets lately that had beendamaged in the manner just indi-cated. In some instances, the setsnearly caught fire. It pays to taketime to clean and scrape wires anduse a good rosin core solder for alljobs, omitting soldering flux in anycase where its use might lead to highresistance leakage of this type.-RoyHale, Middlesboro, Ky.

New Products

Browning TUNERSNew hi -fidelity tuners, designed for

custom installations, are claimed toprovide all the features of larger models.FM Model L-300 has a sensitivity of3.5 uv for 20 db of quieting, 20-20,000cps frequency response, afc, cathodefollower output, tape recorder outputand Armstrong circuit. The AM ModelL-500 has high sensitivity, variableselectivity, 10 kc whistle filter and acathode follower output. Browning La-boratories Inc., 750 Main St., Winchester,Mass.-TECHNICIAN (Ask for No. 3-40)

Illinois CAPACITORSUnusually high insulation resistance,

low power factor and long life per-formance are claimed for the new"Mini Ste-Tite" Type capacitors. Thenon -inductively wound foil assembliesare oil impregnated and hermeticallysealed in steatite cases. They are over-load tested and have a standard toler-ance of ± 20%. Available in capacityranges from .0005 to 1.0 mfd. and in200-400-600 and 1600 wvdc ratings. lin-nois Condenser Co., 1616 North ThroopSt., Chicago 22-TECHNICIAN (Ask forNo. 3-82)

JFD FILTERInterfering adjacent channel signals

can be eliminated by one of these twonew interference filter wave -traps.Model WT26, for the low band, andModel WT713, for the high band, are

sharply tuned traps which are adjustedat each receiver to eliminate the inter-ference. Particularly useful in cases in-volving cross -modulation from excep-tionally strong local station. $4.50. JFDMfg. Co., 6101 -16th Ave., Brooklyn 4,N.Y.-TECHNICIAN (Ask for No. 2-1)

Ohmite FUSE RESISTORSModel No. FR -7.5 is a 71/2 ohm fuse

resistor designed to replace any fuseresistor in TV receivers. It is furnishedwith 11/2 in. tinned wire leads plus aseparate plug-in mounting strip. Theresistor can be soldered to the stripfor plug-in mounting or directly intothe circuit under the chassis. OhmiteMfg. Co., 3675 Howard St., Skokie, Ill.-TECHNICIAN (Ask for No. 3-74)

Tele-Matic WAVE TRAPAdjacent channel interference is

eliminated or reduced by the new"Knock -Out" antenna traps. Factorypre -tuning eliminates all adjustmentsin installation. The unit consists of 2hi -Q traps which provide maximumattenuation of interfering channels.Available for channels 2 through 13.$3.50. Tele-Matic Industries Inc., 16Howard Ave., Brooklyn, N.Y.-TECH-NICIAN (Ask for No. 3-1)

Bogue TRANSISTORGeneral purpose n -p -n ground junc-

tion transistor, intended for applicationsat power, audio and radio frequenciesup to 1000 kc, provide power gains upto 32 db. Hermetically sealed; goodtemperature characteristics. BogueElectric Mfg. Co., Dept. WNH-2, 52Iowa Ave., Paterson 3, N.J.-TECHNI-CIAN (Ask for No. 3-81)


RCA's Music Synthesizer

A technical description of RCA'snew electronic music synthesizer(See p. 54-Feb. Technician) was de-livered to the recent 1955 AIEE Win-ter Meeting in New York By Dr.Harry F. Olson, head of RCA'sAcoustical Lab.

Preliminary to his description ofthe unit's operation, Dr. Olson dwelton the technical characteristics ofsound. These he itemized as fre-quency, intensity, growth, duration,decay, portamento (a frequencyglide), timbre and vibrato (an am-plitude or frequency modulation).Knowing the values of these char-acteristics, and having means forvarying each independently, he said,any given tone can be duplicated.The synthesizer is designed so thatany combinations of these character-istics can be achieved.

New Tone Structures

Since the synthesizer can controlany characteristic of a tone, it cannot only reproduce any knownsound, it can also form new sounds-tones which cannot be duplicated byany known musical instruments.This has opened the door to unique"electronic engineers' compositions"which have tone structures unlikeany previous musical selections.

The exceptional musical accuracyprovided by the synthesizer's all -electronic circuitry can be somethingof a mixed blessing, Dr. Olsonpointed out. The tones generated bythe unit have an accuracy of 1 partin 104, far beyond conventional in-struments. The effect upon the earof such "perfect" tones is eerie andunnatural. Intentional discords andnoise must be inserted for realism.A gas tube noise generator achievesthis effect.

OperationThe fundamental frequencies (30

to 15,000 cps) are provided by 12tuning fork oscillators. After ampli-fication a series of filters, resonatorsand growth, decay and duration con-trols provide the waveshapes andovertone structures desired. Mastercontrol over the complete operationis provided by a punched paperrecord not unlike the old "playerpiano" rolls.

In an experiment conducted to de-termine the fidelity of the syn-thesizer, recordings of its outputwere compared with recordings bylive musicians. Expressed statisti-cally, it can be said with 70% cer-tainty that only 1 person in 4 candistinguish which performance is"live."

Gives your customersbrilliant results...pays off for you!

NEW SONOTONE 1P CERAMIC CARTRIDGE

CUTAWAY VIEW(Actual size 1" long)

1. Easy to install. Just two models fit most armsnow in use. Cartridge is less than 1" long,8/10" wide with bracket. Time -saving hard-ware included.

2. Ceramic element gives flat response (see curve/-requires no preamplification or equaliza-tion. No deterioration problems as with other

1. CONVENIENT SIZEAND DESIGN

2. CLIMATE -PROOFCERAMIC ELEMENT

SINGLE, JEWEL -TIPNEEDLE

4. HIGH -COMPLIANCEMOUNTING

5. SNAP -FIT NEEDLE REPLACEMENT

types...virtually immune to hum pickup.

3. Replaceable needle, diamond or sapphire.Models for 33-45 rpm, or 78 rpm.

4. Extreme lateral compliance and low -mass de-sign give superior tracking, low wear.

5. Neecles snap in, snap out easily.

Tap the Huge 33-45 RPM Replacement Market!Install this new Sonotone IP, and give your customers exciting, true, wide -range response. At one stroke, you make a good sale, cut installation time,avoid problems found with other types of cartridges...and build your reputa-tion for quality work and professional advice. No other cartridge has all theadvantages this I P gives you! With sapphire, $8.50; with diamond, $30.

RESPONSE 30-15,000 ± 3 E/B1

MEIN I 11111111111 1111

1'111111

lious 111111 1111111111111111

5+

0

5-

30 50 100 300 500 IKC 3KC 5KC IOKC 15KC

Response to new industrywide RIAA characteristic shows how IP ceramic cart-ridge self -equalizes, because it works on "amplitude" rather than "velocity" prin-ciple. Here's startlingly improved performance for your customers' phonos!

SONOTONE CORPORATION

ELMSFORD, N.Y.

U'rite Dept. CT -35 for free Mono Modernization Manual


'BOY WHAT A THRILLHAVING NO CALLBACKS r

"That name Tung -Sol is sure reassuringwhen I replace a tube. I know it's goingto stand up like Tung -Sol Tubes alwayshave. It's this kind of dependability thathelps protect my profits and my repu-tation and keeps customers sold on me."

TUNG-SOL'dependable

PICTURE TUBESTUNG-SOL ELECTRIC INC., Newark 4, N. J. Sales Offices, Atlanta,Chicago, Columbus, Culver City (Los Angeles), Dallas, Denver.,

Detroit, Montreal (Canada), Newark, Seattle.

MFRS' Catalogs & Bulletins

MAGNETIC TAPE: The seven questions asked most often about"Scotch" brand "Extra Play" magnetic tape No. 190 areanswered in a new, 8 -page booklet available upon requestfrom Minnesota Mining and Mfg. Co., Dept. M5-2, St. Paul,Minn. (Ask for No. B 3-1)

WIRE & CABLE New illustrated bulletin on shielded wire andcable for microphone and sound system use, Bulletin SW -1,describes new microphone cables with semi -conductingtextile shield as well as the conventional types with braidedcopper shield. Available from Whitney Blake Co., NewHaven 14, Conn. (Ask for No. B 3-2)

DYNAMOTOR POWER SUPPLIES: Catalog No. 155 has 28 attrac-tively illustrated pages and lists the entire 1955 line ofCarter dynamotor power supplies, with complete electricaland mechanical specifications. Available from Carter MotorCo., 2644 N. Maplewood Ave., Chicago 47, Ill. (Ask forNo. B 3-3)

ELECTRONIC COMPONENTS: A new 1955 edition of stock catalogNo. 29 contains 48 pages of photographs and technical datacovering five complete stock lines. It is specifically designedfor the use of distributor salesmen and manufacturing ac-counts and can be ordered only through a representative ofCentralab, Div. of Globe -Union, 900 E. Keefe Ave., Mil-waukee 1, Wisc. (Ask for No. B 3-4)

MINIATURE LOUDSPEAKER: Bulletin No. 1001 describes Jensen'snew miniature loudspeaker P275 -Y, currently being used inthe Regency transistorized radio. All technical informationon the P275 -Y, as well as the new features the loudspeakerincorporates, are listed on the bulletin. Available fromJensen Mfg. Co., 6601 S. Laramie Ave., Chicago 38, Ill. (Askfor B 3-5)SUB -MINIATURE PILOT LIGHTS: The Dialco line of pilot lightassemblies now includes a new sub -miniature series whichmounts in a single 1%2" clearance hole and requires no in-sulating mountings. The series is fully described in bulletinL-156 available from Mr. R. E. Greene, Dialight Corp., 60Stewart Ave., Brooklyn 37, N. Y. (Ask for B 3-6)BATTERY CATALOG: A new catalog showing the manufacturerscomplete line of batteries plus a replacement guide forbattery operated instruments. Also included is a graphshowing battery requirements for transistor circuits. Avail-able from Burgess Battery Co., Freeport, Ill. (Ask for B 3-7)TV SERVICE BOOKS: A sheet describing seven TV service booksby H. G. Cisin noted TV consultant. They are: "TV Doc-tor", $1.00, (reviewed in Dec. TECHNICIAN); "The ABCof Color TV", $1.00, (reviewed in Dec. TECHNICIAN); "TVConsultant", $2.00, "Pix Guide TV Terms", $1.00, "TV TubeLocator", $1.00; "TV Trouble Tracer", 500 and "Shoot TVTrouble Fast", $1.00. Available from H. G. Cisin, Publisher,Amagansett, N. Y. (Ask for B 3-8)COLOR BCST. EQUIPMENT: 20 -page brochure describes the com-plete operation of Du Mont's color and monochrome multi -scanners for 16 mm films, slides, and opaques, together withinstructions for field conversion of monochrome Du Montmulti -scanners to color. Available from Allen B. Du MontLabs., Inc., 750 Bloomfield Ave., Clifton, N. J. (Ask for No.B 3-9)SPEAKER ENCLOSURES: 32 -page booklet discusses speaker bafflesand new enclosure design principle. Free. Ask for BookletP-13. Karlson Assoc., 1483 Coney Island Ave., Brooklyn 30,New York. (Ask for No. B 3-10)

OBTAIN THE BULLETINSdescribed here by writing on company letterhead toBulletins Editor, TECHNICIAN, 480 Lexington Ave.,New York 17, N. Y., listings numbers given at end ofeach item of interest. Please mention title of positionheld. Use coupon on page 36.


FLYBACK & YOKE CHECKER: Bulletin describing the new modelBF -80 "Flyback Transformer and Yoke Checker" is avail-able from Cornell-Dubilier Electric Corp., South Plainfield,N. J. (Ask for No. B 3-11)

HI-FI PRODUCTS: New catalog provides detailed informationon more than 20 high fidelity products, including AM -FMtuners, preamplifiers, amplifiers, speakers, speaker systems,horns, networks and cabinets. Available from Altec LansingCorp., 9356 Santa Monica Blvd., Beverly Hills, Calif. or 161Sixth Ave., New York 13, N. Y. (Ask for No. B 3-12)

New Books

THE RADIO AMATEUR'S HANDBOOK. 32nd Edition. By the Head-quarters Staff of the American Radio Relay League. Pub-lished by the American Radio Relay League Inc., WestHartford, Conn. 148 pp. Paper cover. $3.00. $3.50 in U. S.possessions and Canada; $4.00 elsewhere.

In addition to being indispensable guides for all those in-terested in amateur radio, these annual editions of TheHandbook are also outstanding reference works for theentire electronics industry.

This new Handbook features 5 chapters of basic radiotheory, 3 chapters concerned with the history and operatingpractices of amateur radio, 3 of basic experimental data and15 chapters of advanced theory, together with practicalconstructional details, including transmitters, receivers,transmission lines, antennas, power supplies, SSB, FM,keying, AM and microwave techniques.

Among the principal revisions of the new edition are thosein the vacuum tube tables and base diagrams. Two full pageslisting 67 new tube types have been added to the miniature -tube section alone.

The chapters on VHF have been extensively changed toimprove clarity and to take advantage of techniques de-veloped as a result of greater occupancy of this portion ofthe spectrum. The high -frequency section has also beenrevised to include such new features as continuous (multi -band) tuning circuits and clamp -tube protective circuits.

SINGLE SIDEBAND FOR THE RADIO AMATEUR. Prepared and pub-lished by the American Radio Relay League Inc., West Hart-ford, Conn. Paper cover. 208 pp. $1.50 in the U.S.; $1.75elsewhere.

A comprehensive digest of over 30 QST articles dealingwith the subject of single-sideband transmission and recep-tion. Recommended as a reference work and training text forclass or home study. Text is liberally illustrated with over300 photos, charts, tables and formulae.

ELECTRICITY AND MAGNETISM. By Ralph P. Winch. Publishedby Prentice -Hall Inc., 70 Fifth Ave., N. Y. 11, N. Y. 755 pp.Hard cover. $7.75.

Designed for college -level courses in electricity and mag-netism this book assumes a previous knowledge of basicphysics and elementary differential and integral calculus-though the author makes a point of avoiding the use ofcalculus where possible. Primary emphasis is on ac and dccircuit analysis, with particular attention to the action ofcircuit components-capacitors, resistors, and transformers.In addition, there are particularly thorough treatments offerromagnetic materials, magnetic fields and oscillatingcircuits.

UHF CIRCUITS AND COMPONENTS. By Milton S. Kiver. Publishedby D. Van Nostrand Co., Inc., 250 Fourth Ave., New York 3,N. Y. 415 pp. Hard cover. $7.50.

This comprehensive handbook, of broad appeal and up-to-date, may be equally useful to technicians, hams, studentsand engineers-anyone, in short, who deals with equipmentoperating in this range. Coverage includes transmission lines,antennas, waveguides, resonators, oscillators and measure-ments in this frequency range. Also treated are specialtubes, such as the magnetron, klystron, resnatron and others.

'MAN, OUR SETSURE WORKS SWELL NOW r

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TUNG-SOL®dependable

TUBES -DIAL LAMPSTUNG-SOL makes All -Glass Sealed Beam Lamps, Miniature Lamps, Signal

Flashers, Picture Tubes, Radio, TV and Special Purpose Electron Tubesand Semiconductor Products.


Service Assin. Reports

Technician not ServicemanSays ARTSD

In the last issue of the AssociatedRadio -Television Service Dealers'News, 2552 N. High St., Columbus,0. protest is made against the con-tinued use by both the Radio Corp.of America and the General ElectricCo. of the word "serviceman" insteadof "technician." Members of this as-sociation are delighted at the pushthey have been given with National

Servicemen's Week and TV ServiceMonth, sponsored by RCA and GE,but are still chagrined at being called"servicemen" instead of "tech-nicians."

(Ed. Note: We, too!!)

GUILD PublishesShopping Reports

Effective with the February issue,the Radio Television Guild of LongIsland, Box 87, Bethpage, N. Y., isfeaturing the results of their dis-tributor shopping program eachmonth. The report will list the dis-tributors who were shopped and theresults of each shopping.

for your service truck . . .

service kit . . .

extra bench tool

MODEL810 0

This newest Weller Soldering Gun tills your need for an extra solderingtool. Its new, compact design includes all regular Weller Gun features,at a rating of over 100 watts. Its new, low price makes it as convenientto buy as it is to own!

SEE THE WELLER jUitint AT YOUR DISTRIBUTOR NOW

Week}Unith, SOLDERING GUN805 Packer Street, Easton, Pa.

After much planning, members ofthe Guild have made certain changesin their constitution and by-laws tohelp carry out the expanding Guildprograms.

TV FOR THE NEEDY

Long Island Electronic Technicians Assoc.member, Cosmo Barbaro, installs a TV setfor a multiple sclerosis patient. Set wasdonated to a pool of TV sets and radiosset up by Multiple Sclerosis Society andLIETA. Assoc. overhauls and rebuilds setsfor the use of MS patients as partof LIETA's Community Service program.

RTA Springfield BranchElects new Officers

At a recent meeting of the Radioand Television Association ofSpringfield, Ohio, 1805 Edwards Ave.,the following officers were elected:Marvin A. Miller, pres., Frank H.Gross, vice-pres., Jack Carpenter,treas. and Paul Boller, secy. Guestspeaker George Reiling, district rep-resentative of the RCA tube div.,discussed the forthcoming nation-wide campaign to honor TV tech-nicians.

SARTA Elects New OfficersNew officers were elected at the

last meeting of the San AntonioRadio & Television Assoc., Inc., 520W. Hildebrane. They are: Thomas F.Boyd, pres., H. M. Willmann, secy.,Wilbur L. Lehmberg, treas., and PaulW. Carter and Porfirio Zepeda as di-rectors.

MAX FISCHMAN CO. of Pittsburghhas been appointed distributor in 0.,W. Va. and Penna. for the TV andbroadcast receiver div. of BENDIXAVIATION CORP. . . . KILSBYREFRIGERATION CO. of Honoluluwill cover the Hawaii territory for thesame div. of BENDIX.

NAT'L. ELEC. DISTS. ASSOC. Tri-State Chapter met recently for electionof new officers. HERBERT J. FARR, Jr.was elected pres. and EDWARD COR-SICA secty.

EMERSON RADIO & PHONO. CORP.will market a transistorized radiowithin 60 days, promises Ben Abrams,Emerson pres.

GORDON DOUGHERTY has beenelected sales mgr. for BRENNA &BROWNE, mfrs' reps in the territory ofHawaii.


"Tough Dog" Corner

(Continued from page 24)were checked to no avail. Finally,following one occasion when the pixfailed, I tried readjusting the beambender (ion trap) magnet. Thescreen lit up, but not as brightly asbefore.

As long as the set was kept run-ning after this adjustment, the crtwould stay lit. However, when theset was turned off for a few hoursand then turned on again, the beambender had to be restored to itsoriginal position to produce a raster.

Replacement of the ion trap mag-net with a new one cured the trou-ble. Heat from the crt filament ap-parently changed the magneticcharacteristics of the beam bendergradually.-.T. L. Mancini, Winthrop,Mass.

Critical Hold, PullingThe symptoms on this 24 -in. Syl-

vania 512-2 chassis were horizontalpulling and very critical horizontallock. After replacing the sync am-plifier and separator, the noise in-verter and phase detector tubeswithout getting rid of the pulling, Ilooked for 60 -cycle modulation inthe composite video waveform at theplate circuit of the video amplifier,using a scope. No dice. I measuredall the dc voltage readings in thesync, noise inverter, and phase de-tector stages, and they all comparedfavorably with those in a Sylvania515 that we had in the shop. Havingwasted precious time a while backon another set that had pulling, onlyto find a heater -to -cathode leak inthe r -f tube, I took time out to checktuner and video i-f tubes in a tester.All were okay.

I discovered then that removingthe noise inverter tube caused thepulling to disappear. Ah! I was onthe road to success. A scope showedthat my horizontal sync pulse wave-form on the grid of the sync sepa-rator dropped in amplitude when Iput the noise inverter tube backin. I thought that I had isolated mytrouble to the noise inverter stage,but was I fooled! All voltage read-ings and resistor values checkedokay, and I couldn't find any leakycapacitors. On an earlier Sylvaniachassis I had found that, by chang-ing the resistance in the cathodecircuit of the noise inverter to giveit more cathode bias, I corrected ahorizontal "hopping" trouble. This"dog" was different in that the in-verter obtained its cathode bias fromthe cathode circuit of the 6BQ6,

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horizontal output tube. The cathodevoltage was too high in the presentcase instead of being insufficient,so the idea was out.

The high cathode voltage on the6BQ6 was a clue that took a whileto sink in. Then came the dawn. Ibridged the 2 mfd cathode bypasscondenser of the 6BQ6 (C-262) withanother unit, and the picturestraightened out. The defective ca-pacitor was not open, for it couldacquire a normal charge. It took along time, however, for it to dis-charge through a meter (long com-pared to the discharge time of a

good capacitor), indicating a high re-sistance joint on one of its terminals.This made it as useless as if it wereopen.

W,thout any bypassing on the6BQ6 cathode, a negative pulse wasdeveloped across the cathode resis-tor. This pulse was fed to the cath-ode of the noise inverter, permittingthe latter tube to conduct duringhorizontal retrace time, which in-cludes sync pulse time. As a result,the noise inverter not only cancellednoise, but the horizontal sync pulseas well!-E. R. Nelson, Tonawanda,N.Y.

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ModelTK1500

Clear Beam

HUNTER

News of Industry

July P. BROCKI has been namedasst. service mgr. and A. C. BOSS hasbeen appointed chief field engineer ofthe TV and Broadcast Receiver div. ofBENDIX AVIATION CORP., Baltimore,Md.

WILLIAM C. BAINBRIDGE has beenappointed director of automation forAEROVOX CORP., New Bedford, Mass.

HOWARD S. ORCUTT has been ap-pointed chief engineer of the rectifierdiv. of PYRAMID ELECTRIC CO., N.Bergen, N. J.

GOODWIN G. MILLS has beennamed manager of the electronic kitdept., and LEONARD S. PRESKILL hasbeen appointed product developmentmgr., for ALLIED RADIO CORP.,Chicago, Ill.

FRANK B. ROGERS, JR. has beenelected executive vice-pres. in charge ofSoundcraft operations for REEVESSOUNDCRAFT CORP., New York,N. Y.

JAMES W. SAFFORD, formerlyEastern regional sales mgr. for the radio& TV div. of SYLVANIA ELECTRICPRODUCTS, INC., has been namedsales mgr. of ANDREA RADIO CORP.,Long Island City, N. Y.

HOTTEST NINE FRINGES ',NATICLEAR BEAM'S

7B2 ay Model MYhi 50.2

New wave trap principle givesextremely high gain, sharp di-rectivity, in -phase tuning on allchannels. New, flat design forlow wind resistance)

ALL -BAND,FRINGE

ANTENNASEach a peak performer in itsfield ... a triple threat to anyfringe problem . . . with more

11111111-1101110 dollar -for -dollar constructie$value!

The Tri-King TK1500 offers super fringeperformance through better design features. Halfwave electrical spacing between dipoles for highergain on every channel. Positive "back up action"

through the use of a full radar screen ... acclaimedindustry -wide as the finest reflector ever designedfor ghost rejection and elimination of co -channel

interference! Fullywind tunnel tested.Available in single

bay ( Model TK1000 )and Super, wide

spaced array( Model TK1800).

Clear Beam

BIG CHIEF2 Bay Model BC 12-2

An advanced conical-Yagi with element diam-eters varied for precisiontuning, matched sensi-tivity and peak perform-ance on high and kWband!

CLEAR ANTENNA CORP.

BEAM Canoga Park, Calif. Chicago, Ill.affiliated with TEMPO TV products

DR. A. MELVIN SKELLEIT has beennamed director of color television tubeplanning and development for TUNG-SOL ELECTRIC INC., Newark, N. J.

Dr. A. M. Skellett Frank F. Neuner

FRANK F. NEUNER has been ap-pointed to the new post of mgr., semi-conductor marketing, tube div., RADIOCORP. OF AMERICA.

MILTON BINSTOCK has been ap-pointed vice-pres. and director of salesfor SHELDON ELECTRIC CO., Irving-ton, N. J. Other appointments were:FRANK FERDINAND to sales mgr.,DAN ROSENMAN to asst. sales mgr. &JAMES B. MANNION to exec. asst. ofsales dept.

FLOYD REID has been named de-velopment engineer at ORRADIO IN-DUSTRIES, INC., Opelika, Ala., mfrs.of Irish brand recording tape.

MORRIS SALIT has been namedpres. of INDUSTRIAL TV UTILITIESCO., New York, N. Y.

WILLIAM H. KELLEY has beenelected vice-pres, and general mgr. ofall mfg. and sales divs. of ALLEN B.DU MONT LABS., Clifton, N. J. Otherappointments: JOSEPH MANN to ad-ministrative services mgr. for TVreceiver sales div. and ROBERT G.SCOTT to gen. sales mgr. of cathode-ray tube div.

WILLIAM J. GORMAN has been ap-pointed merchandising mgr. of JEF-FERSON ELECTRIC CO., Bellwood, Ill.

ARTICLES WANTED

TECHNICIAN is in the market for shortarticles from expert servicemen on thefollowing subjects:

Hi-Fi (Theory and Servicing)TV and Radio InterferenceIndustrial Electronics (Theory and

Servicing)TV Antennas (Installation and

Servicing)Test EquipmentUHF

Preferred length is three typewrittenpages, double-spaced. Two or threedrawings should accompany the articles.

If you'd like to do a piece for us,query first, telling us something aboutyour background, and briefly summariz-ing what you propose to write about.

Payment is excellent.

Write to S. C. Silver, Managing Editor,TECHNICIAN, Caldwell -Clements, Inc.,480 Lexington Ave., N. Y. 17, N. Y.

Warehouses in Seattle, Portland, San Francisco, Honolulu. Dallas, Kansas City. Chicago. Detroit. Balttrnore


B. B. BAUER, vice-pres. of SHUREBROTHERS, INC., Chicago, was electeda Fellow of the Audio Engineering So-ciety.

LT. CMDR. SARAH WHITE has beenappointed to salesman -major accountsfor INTERNATIONAL RESISTANCECO., Phila.

CLIFFORD T. BURGETT has beennamed field service engineer in theCharlotte, N. C. region for CAPE-HART-FARNSWORTH CO., FortWayne, Ind.

VERNE G. RYDBERG has been ap-pointed manager of power tube equip.sales for WESTINGHOUSE ELEC-TRONIC TUBE DIV., Elmira, N. Y.Also appointed was RAYMOND W.ANDREWS as manager of customerorder and sales service.

WILLIAM H. McREDMOND hasjoined the field service engineering staffof CRESCENT INDUSTRIES, INC.,Chicago. Ill.

SYLVANIA SALES SEMINAR

Pictured at the "sales meeting seminar" ofSylvania Electric Products Inc. are: L. toR. Sol Alter, Bay Electronics, Bronx, N. Y.;D. W. Gunn, Sylvania's general sales mgr.and Hy Weintraub also of Bay Electronics.

JOSEPH A. LAGORE has been ap-pointed vice-pres., mfg. and JAMES D.McLEAN as vice-pres., sales atPHILCO CORP., Phila. Also announcedwas WILSON H. OELKERS to vice-pres. in chg. of purchasing.

GILBERT HOFFMAN has beennamed comptroller of branch distribut-ing operations for CBS -COLUMBIAINC., Long Island City, N. Y.

EDWARD BLUESTONE is now chiefengineer at INSTRUMENTS FORSERVICE, INC., Baldwin, L.I., N.Y.

CMDR. DOUGLAS W. A. PLEASAN-TON has been appointed exec. vice-pres. of ROCKE INTERNATIONALCORP., New York, N. Y.

EARL F. BOYLE was elected a direc-tor, vice-pres. and general mgr. forVAN CLEEF BROTHERS, INC., Chi-cago, Ill., industrial and automotiveproducts mfrs.

MILTON J. SHAPP, pres. of JER-ROLD ELECTRONICS CORP., Phila-delphia, Penna. is featured in theFeb. 4th issue of Collier's in an articletitled "How to Think Your Way to theTop."

(NEWS CONTD. ON PAGE 60)

foirrivamwNEW . . .

fiestawe..

)

%NOr --

MODEL 532

COMPLETE

PORTABLE

SERVICEUNIT

DYNAMIC PLATE CONDUCTANCE TUBE ANALYZER

ACCURATE VOLT -OHMMETER DRY BATTERY TESTER

CONDENSER LEAKAGE TESTER

ALL IN ONE ATTRACTIVE LUGGAGE TYPE CASEHere's a new Chicago instrument with more L seful features than you will find atanywhere near the price. You can check all receiving tubes (also picture tubes)

quicloy and accurately.

The Model 532 is strictly a quality instrument with a patented switching arrange-ment for quick set-ups to test diodes as diodes, triodes as triodes and pentodes aspentodes. It includes an illuminated roll chart, large 3 -color clear p'astic meter,

picture tube adapter and highly attractive 2 -tole Fabr;cord covered case.

The volt -ohmmeter is of the same excellent accuracy for which Chicago instrumentshave long been noted. It has the following rarges:

A.C. Vo ts. 0-10, 100 500 1 300

D.C. Vo ts: 0-10'100 500 1300Ohms: 0-5000 50,000, 500,000 50 meg.Model 532 Price Complete-Only $90.00 net

Model 531 Tube and Battery Tester (not illus I Similar to Model 532 but for tubeand battery testing only. Attractive blue simulated leather covered, wood carry case.This genuine dynamic plcte conductance tube analyzer is now yours at the price ofan ordinary tester. Its it umirated roll chart lists all receiving tubes including thevery latest types now coming on the market.

Ask your Jobber or write for complete informoticnModel 531 Complete with Picture TubeAdapter-only $70.00 net

Chicago INDUSTRIAL INSTRUMENT CO.

536 W. ELM STREET CHICAGO 10, ILL.

SURPLUS MATERIAL SALESMiscellaneous Material

Sealed bid-to be opened March 18, 1955 at 1 p.n. Bids accepted up to time of bid opening.W,stinghouse Electric Corporation, Air Arm Division, Friendship International Airport, Baltimore 27,Maryland.

SALVAGE AND SCRAP. S lots Automatic Pilot Parts and Special Electronic Components consisting

of the following:

Lot I -Miscellaneous test equipment, lectronic assemblies and blowersLot II -Electronic assemblies containing precious metalsLot III-Miscellaneous metal containersLot IV-Miscellaneous work in process end partsLot V -Special fools consisting of dies, jigs and fixtures.

Mateial may be seen between 10 and 12 a.m. and 1 and 4 p.m. Monday through Friday fromMarch 1 through March 17. Lot bids ONLY. Located above.


Rad-Tel for1 FULL YEAR

Guaranteed Tubes70% to 90% OFF! Some Day Service All Tubes Individually Boxed 400 Types Always in Stock

For Oualily-Performance-DepondobilityTypeOZ4MlAX21B3GT1E71H41LA611H411-N51125

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1 X2A3A33AU638C5313N63CB6304305GT3543V4411074BZ75AW45J65T45U4G5U85V45Y3GT6AB46AC7M6AF46AG56AG7M6AH46AH66AK56AK66AL56AM86AN86A056A066A076AR56 AS56AS66AT66AU4GT6AU5GT

Price.65.6273

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1 4941

6882

Type6AU66AV5GT6AV66AX4GT6BA66BC56BC76BE66BG6G6BH668166BK56BK76BL7GT6BN66806GT613076BZ76C46CB66CD66CF66C566H6GT6J5GT6J66K6GT6166076546SA7GT6SH7GT65J7GT65K7GT651.7GT65N7GT6507GT6T46T86U86V6GT6V86W4GT6W6GT6X46X5GT6X87A77A87B77C57C6

Price Type.46 7F7.83 71-17

.40 7N7

.65 70749 7Y4

.54 12A482 12AL551 12AT6

1.25 12AT753 12AU649 12AU780 I2AV6

.80 12AV783 12AX474 12AX798 128490 12BA6.90 1213E640 12BF654 12BH7

1.11 12BY764 12CU651 12SA7GT

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.80 3585

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.49 8069 117Z359

400 Tube Type List 8. Parts Catalog Free

Price.79.59.69.66.69.60.37.41.72.46.60.39.73.67.63.60.49.51.39.63.65.98.65.67.63.57.52.56.46.38.63.63.79

1.39.69.83.98.51.52.51.51.47.54.59.47.55.52.51.61.43.37

SELENIUM RECTIFIERS Mid65 DCNa. each .5975 DC -Ma. . each .69

100 DC -Ma. .. each .79150 DC -Ma. each .81200 DC -Ma. each 1.25

by FEDERAL250 DC -Ma.300 DCMa. .

350 DC -Ma. .

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TERMS: A 25 deposit must accompany all orders -balance C.O.D. All shipment,F.O.B. Irvington warehouse. ORDERS UNDER $10-$1.00 HANDLING CHARGE

. Subject to prior sale.PLEASE: Send lull remittance . . allow for postage and save C.O.D. cha yes! Werefund all unused money.

Red -Tel TUBE CO.'Integrity Is Our Chief As.rel

115 COIT ST., IRVINGTON II, N. J.

1955TECHNICIAN

BUYERSDIRECTORY

to be published in theMAY ISSUE of

TECHNICIAN& Circuit Digests

The only directory of its kind in the TV -electronic service field reaching 50,000of the industry's key personnel

Jhcluding-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 associations.-Complete finding index -alphabetical.

And . . .

-The sensational, exclusiveLOCALIZER INDEX

Your Localizer listing, immediately under your free edi-torial listing 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 list of your representatives, arranged alpha-betically by cities.

These Localizer listings are a new selling punch, deliveredat the point of sale. They minimize long distance tele-phone and telegraph charges, reduce time-consuming cor-respondence, ricrease the number of inquiries, speedservice to the customer and help to get orders in placeswhere local bias exists.

Listings avai,able by the inch -First inch, $20.00:each additional inch, $20.00

Closing Date -April 10

Send for circular giving specimen listings and other typesof paid listings available


New Midget Multimeter

Only slightly larger than a kingsize pack of cigarettes, yet boastingthe meter sensitivity, ranges andflexibility of large, elaborate instru-ments, Simpson's new "Midgetester,"Model 355, is a welcome addition tothe field of TV servicing equipment.

The unit measures only 23/4 x 41/2in. overall and has a smooth plasticcase which surrounds the entire in-strument; clear plastic over thefront, and black plastic over theback.

The sensitivity of the indicatingmeter is 78 ga. This is shunted forall measurements so that the basicsensitivity of the instrument is 100mu. The loading characteristic, then,is 10,000 ohms/volt on-and this isworth noting-both ac and dc ranges!The average service -type meter hasan ac loading characteristic of 5,000ohms/volt, or less.

Cigarette pack -sized meter, the "Midgetester"

The meter employs a self -shieldingcore magnet movement which allowsit to be placed close to magneticfields without danger of the pickupaffecting the readings.

The test leads furnished with theinstrument are special types havinga threaded tip at one end and a sharpprobe at the other. The threaded tipsare screwed into the appropriatehole in the front of the meter. Pro-.vision is made for quickly attachingclips to the probes when desired.

Ranges covered by the instrumentare; 5 volts ranges, both ac and dc,from 3 v. to 1200 v., and 4 resistanceranges, 10,000 ohms (120 ohms cen-ter). The measurement accuracy is3% de and 5% ac, and within 3° ofarc from absolute value of resistancebeing measured.

TECHNICIAN-(Ask for No. 3-90)


PAGES 30, 32, 34, 36, 38, 40, 42, 44, 61

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Electronic Cooling Pioneer DevelopmentAmong several electronic develop-

ments recently unveiled by RCAChairman of the Board Brig. Gen.Sarnoff is an all -electronic coolingdevice for eventual use in refrig-erators and air conditioners. (seeFebruary TECHNICIAN, p. 54.)

Without motors, compressors ormoving parts, the noiseless deviceoperates on a principle known asthe "Peltier effect." Though discov-ered more than 120 years ago, theprinciple has been little more than ascientific curiosity until recentstudies in solid-state physics openedthe door to the possibility of practi-cal application.

The cooling action noted in the"Peltier effect," explained in greaterdetail elsewhere on this page, takesplace at one junction between twodissimilar materials during the pas-sage of an electric current throughthem. In the electronic cooler, cop-per and zinc alloys are used to forma series of junctions which surrounda container. At present, a mechanicalpump is being used to circulate wa-ter for removal of heat from the ap-paratus, but a means is being workedout to pump the water electronically.

The Peltier EffectThe recently announced electronic

cooling system depends upon Peltiereffect to produce its action. In thisphenomenon, the passage of elec-

tricity through a junction results incooling at that junction.

This action may best be under-stood by first considering another so-called thermoelectric action knownas the Seebeck effect. The latter isillustrated in sketch A. Here twometals, say copper and iron, arejoined in such a way as to form twojunctions. When heat is applied to

A-Seebeckemf through

effect. 8-Peltier effect, withmetals producing cooling action.

junction 1, thermal agitation of elec-trons occurs. As a result, electronsat the hot junction transfer from theiron to the copper. The net result isa voltage difference-an emf actingaround the circuit in the directionfrom the copper to the iron at thejunction.

The Peltier effect, shown in sketch

B, is similar to the Seebeck effect,but there is an important exception.In the latter phenomenon, an ex-ternal electrical force is applied tothe combination of two metals, in-stead of external heat, but a similarmotion of electrons takes place.

Current passing through junction1' requires heat to be supplied in or-der to maintain the conditions foroperation, as was the case with theSeebeck effect. Since no externalheat source is available, the neededheat is absorbed from the metalsthemselves in the neighborhood ofJunction 1', producing a temperaturedrop in this region. In other words,in order for the junction to heat, itwithdraws heat from surroundingareas. This is the same as saying thatit exerts a cooling effect on sur-rounding areas.

At junction 2' the current flow isfrom iron to copper. In other words,the electron flow is from copper toiron, which is the more difficult di-rection. The work that has to be donehere heats junction 2'.

In a commercial cooling system,junction 1' would be in the freezingor heat -withdrawing unit, whilejunction 2' would have its heat car-ried off by moving air or water. Thecirculation of air or water is used tocarry heat off in similar fashion inpresent-day cooling and refrigerat-ing systems.

Tape Recording Glossa ry-SupersimplifiedA short dictionary for enthusiasts

in tape recording, which is decidedlyon the non -technical side, is avail-able from Minnesota Mining andMfg. Co., Dept. M5-12, 900 FauquierSt., St. Paul, Minn. Covering 57 basicwords and phrases commonly usedin tape recording, the glossary usessprightly illustrations to get its con-cepts across.

Some of the illustrations are re-

produced on this page. While defini-tions are geared to the needs of thenon -technical, they may serve asbasic jump-off points for the skilledelectronic technician who has to startfrom scratch as far as magnetic re-corders are concerned. Typical defi-nitions are as follows:

"DECIBEL-Abbreviated "db," itis a relative measure of sound in-tensity or "volume." It expresses the

ratio of one sound intensity to an-other. One db is the smallest changein sound volume that the human earcan detect.

"DISTORTION-Any differencebetween the original sound and thatreproduced by a recorder.

"DYNAMIC RANGE-Ratio be-tween the softest and loudestsounds." (Ask for No. B3-15)


GE Sponsors "TV ServiceMonth" April 19 -May 19

"We feel the social significance oftelevision demands we do everythingpossible to promote understandingand good relations between the serv-ice dealer and the public." With thisstatement, J. M. Lang, gen. mgr. ofGE's tube department, officiallylaunched the company's plans for"TV Service Month"-April 19 toMay 19.

The program will be touched offnext month by a huge advertisementin Look magazine-a directory of allservice dealers that handle GE elec-tronic tubes. This will be followed bya month -long barrage of advertising,through all media, aimed at makingthe public conscious of the TV tech-nician's role in the community.

High spot of the broad public -rela-tions program will be a $25,000 jinglecontest. "TV Service Month" em-blems identifying each dealer's shopas a headquarters for the contest areone of the many promotion aids.

GE representatives are now in thefield, alerting technician -dealers onhow they can participate in the pro-motion and how they can derive themost benefit, on the local level, fromthe mass of national advertisingwhich will be hitting the consumers.

Anniversary CelebrationThe 25th anniversary of the found-

ing of JFD Mfg. Co., 6101 -16th Ave.,Brooklyn, N. Y. will be the occasionfor a testimonial banquet honoringJulius Finkel, the firm's founder,

Emblem of anniversary drive

and awards to people outside thecompany who have furthered theindustry. The celebration, which willcontinue to the end of the year, willbe highlighted by contests and spe-cial dealer bonuses.

KESTERAbsolutely non -corrosive andnon-conductive, KESTER"RESIN -FIVE" CORE SOLDERcontains an activated type ofresin that gives you that fast,positive action on all yourjobs . .. including the mostdifficult.

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Aner COLOR CODE CALCULATORFOR TUSULAR commr. CAPACITORS

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Use this handy CentralabColor Code CalculatorMatch the colors on this calculator with the colors on anyceramic capacitor or resistor coded in accordance with JANor RETMA requirements. When you do, the information you'relooking for shows up on the face of the calculator. There'stemperature coefficient, capacity, and tolerance.

That's certainly easier and surer than relying on memory,isn't it? And it's faster than measuring by instrument.

Get your Centralab Color Code Calculator from yourCentralab distributor now.

A DIVISION OF GLOBE -UNION INC.S 02C E. Keefe Avenue Milwaukee 1, Wisconsin

TECHNICIAN March, 1955 SS

Horizontal Circuit TroublesRinging Elimination

Sweep -circuit ringing tends to ap-pear in some television sets after ayear or more of service, and thesame trouble is even found in somenew sets, in the form of a distortionat the left side of the picture (seesketch 1).

Most sets have a condenser acrossone-half of the horizontal yoke, andif this condenser isn't the rightvalue, the distortion arises.

DISTORTION(RINGING)

MORI Z.YOKE

2 HORIZ.SCANNINGLINES

RT SCREEN

A

VERT. YOKE VERT. YOKE4 4 I IIIHORIZ.YOKE

B

We found the solution to theproblem consisted of bringing a pairof leads (A and B in sketch 2) outfrom the yoke coils, and connectingthem to a variable condenser. Thistrimmer was adjusted until the ringsdisappeared; the amount of capaci-tance now present in the circuit wasmeasured, and a condenser of thatvalue installed in place of C-1, tocure the trouble.-Harry J. Miller,Phila. 3, Pa.

Output Tube DamageWhen replacing a horizontal oscil-

lator transformer, or performing anyother repairs in this circuit, it is pos-sible that the output tube or trans-former may be damaged before thecircuit is properly adjusted to fre-quency, due to the lack of drivingpower to the 6CD6-G, 6BG6-G orother output tube used. This lack ofdrive removes most of the bias (andin some cases all of it) from theoutput tube; the plate will run redhot as a result, with possibly doublethe normal current flowing through

the transformer primary.To prevent such an occurrence, it

is advisable to make a very definitemark on the scope indicating its 15,-750 kc setting (or its 7875 kc setting-half-line frequency), so that theserviceman can quickly determinewhat frequency the circuit undertest is operating at. (The horizontaloutput tube is removed from thecircuit during this check.) The hori-zontal oscillator and stabilizer slugscan thus be set approximately rightbefore the output tube is re-in-serted, and it can be ascertainedahead of time whether or not suffi-cient driving voltage is available atthe grid. This voltage should behigher than normal with the gridloading provided by the tuberemoved.

In the case of series -heater cir-cuits, the correct value of wire -wound resistance may be insertedinto the output tube socket, to sub-stitute for the tube filament. M. G.Goldberg, St. Paul, Minnesota

Foldover RemedyThe "low" lead of the high -volt-

age filter condenser may be con-nected to either "A" or "B" in vari-ous TV receivers (see sketch). Con-nection "B" adds the B plus voltageat that point to the high -voltage sup-ply; it also adds additional capaci-tance to the horizontal circuit. Theadded capacitance from this source,plus the normal stray capacitancepresent in the horizontal deflectioncircuit, sends to "stretch" or

lengthen the horizontal retrace time.If the horizontal retrace is stretchedbeyond the blanking period, foldoveron the left side of the picture willresult.

Due to aging of components, orcomponent replacements, the unfor-tunately narrow margin present insome sets between allowable andexcessive capacitance may be ex-ceeded. In such instances, the fold -over may be removed by re-routingthe capacitor return to point "A"(when it has been found connectedto "B"). The change is permissibleonly if sufficient high voltage re-mains present after the re -wiring(several hundred volts are removedfrom the hv supply by this rerout-ing).

Most sets, it will be found, will stillhave ample brightness and requireno further adjustment. Some, how-ever, may require readjustment ofthe drive control and possibly thewidth control as well (if the widthis appreciably altered by the drivecontrol re -adjustment).

Some cases of foldover are, ofcourse, due to a yoke defect, and willrequire replacement of the yoke.-James A. McRoberts, Brooklyn, N.Y.

Width Coil TroubleWhile the particular television set

in which this trouble occurred wasa Tele-King model K-72, there aremany other receiver makes (such asGE and Westinghouse) which em -


To eliminate some cases of horizontal folder, re-route return of condenser C from point B to A.


Auto Radio Bench Hints

(Continued from page 26)

12-v auto radio. In some instances,however, a number of turns mayhave to be removed.

Storage Battery HintHere is a hint for using two batter-ies, neither of which is in perfectcondition, and therefore will not de-liver full current to a large autoradio (especially one with motor orsolenoid -driven automatic selectors)without a considerable drop interminal voltage taking place. Thishint is tailor-made for those shopsthat do little auto radio work, andcan therefore use two second-handbatteries for the few jobs that, docome into the shop.

Connect the two batteries so thatthey are in parallel when they areto be used on 6-v receivers, as wellas on a charger designed for 6-v bat-teries only (as mine is). When usedfor a 12-v set, place the two batteriesin series; they now deliver 12 v atonly half the current required on 6-vsets; in this way, the drop in termi-nal voltage is minimized.

Radio -TV Rectifier


Note that twice the desired outputvoltage must be supplied by thetransformer because of the center -tap arrangement. If the transformerhas no center tap, or one half of thetransformer is burned out, the cir-cuit shown in Fig. 6 may be used un-der certain conditions, remembering,of course, that one winding mustcarry current during both halves ofthe ac cycle and that, unless it iswell designed, it will overheat if re-quired to supply the same voltageas before. Small limiter resistors ofhalf normal value are used whereshown. Full -wave rectifiers arefound in practically all old ac modelradios, most old and some new TVreceivers, and in Hi-Fi equipment.

CHICAGO-The board of directors ofthe 1955 Electronic Parts DistributorsShow will be hosts at the second annualOverseas and Pan-American receptionat the Conrad Hilton Hotel on May15th. The reception will honor overseasand Pan-American visitors to the PartsShow held May 16-19.

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Leading builders of radio andTV sets and electronic equip-ment have approved ERIE com-ponents and have used themfor many years.

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Write for latest catalog andthe name of your nearestERIE Distributor.

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BAR GENERATOR: Projects on actualBar Putt n any TV ReceiverScreen. Po will consist of 4 to16 horisontal bars or 7 to 20 vet-timl bars.CROSS NATO( GENERATOR: Projectsa crosshatch pattern en anyTV pi ttttt tube. Pattern can t i ttt ofnomshifting, heti:onto' and verticallines, interlaced.

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fro R. F. SignalGenerator for F.M.

V' Audio FrequencyGenerator

R. F. SIGNAL GEPERATORtGe Radio Frequencies Iron,100 Kilocycles to 60 Megacyclesen fundamentals and frees 60Megacycle' to 180 Me Itson powerful hannoniks.

DOT PATTERN GENERA-TOR (FOR COLOR TV):The Dot P projectedon any color TV Receivertube by the Model TV -50will enable you to adjustfor proper color tgent,.

V Bar Generatort.." Cross Hatch Generator Color Dot Pattern

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VARIABLE AUDIO FREQUENCY GENERAIOR: Provides a variable 306cycle to 20,000 cycle peaked way.audio signal (also fixed 400 cycl.sine wove'.

MARBER GENERATOR: The Model TV,SO insludes all the most frequentlyneeded marker points. 189 Kt., 262.SKs., 456 Kc., 600 Ks., 1000 Ks., 1400Ks., 1600 Ks., 2000 Kr., 2500 Kt.,3579 Ks., 4.5 Mc., S Mc., 10.7 Mc.,(3579 Ks. is the color burst fre-quency).

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Flyback Repair; Eliminating Ringing, Foldover and Instability;

Width Coil Defect; Protecting Hor. Amp.

(Continued from page 56)ploy a similar circuit, and maytherefore develop similar difficulties.

Symptoms: Picture was out ofphase horizontally, when locked intosync by the horizontal hold control.It would hold steady on the crt, butwas shifted to the left of the screen

Portion of sweep-afc circuit, showing how hor.sweep signal is applied to phase detector.

approximately one inch, causing thehorizontal blanking bar to becomevisible. Readjustment of the hori-zontal frequency control did not im-prove matters. Voltage checks re-vealed nothing wrong. Scope testsshowed, however, that horizontalsweep signal was missing from theinput of the phase detector.

After a thorough check of thehorizontal oscillator circuit, I foundthat the secondary of the width coilhad increased in resistance from thenormal 22 ohms to approximately40,000 ohms. Replacement of theaforementioned coil was all that wasnecessary to correct the trouble.-Frank M. Dickinson, Stony Point,N.Y.

Flyback Repair

Here is a short-cut that I haveused successfully in cases where thephase detector winding of a flybacktransformer short-circuits to thedamper or primary winding (seesketch). The phase detector windingreferred to is used in a number ofFada and Philharmonic TV receiv-ers. A loss in the high voltage on thepix tube anode will be produced bysuch a short.

A TG AGCTUB(

HORIZONTAL OUTPUT68065T

1117145.55

2 7011

r Tel

*AMP NeCx, "°C 1.7u2

HORI2 LIM

- =7C.K.

703

3

10 R71922

'Mar

T 701183 CAP

NV RECT

SWGTDAMPER

I-1705WIDTH

87,73.9

2.3,574

C7I8500

MMF

Partial schematic of Hoffman 196 chassis. Intermittent open in C-716 upset hor. sync.

To remedy the trouble, removethe wires leading to terminals 8 and9 of the flyback. Then wind about40 turns of no. 30 wire around th(

TOPLATE

OF

183OLD CIRCUIT

61306-0 SITPHASE

9 DETECTOR

SHORT

.0,MFD

OCCURSHERE

7 ToDAMPERTUBE

TOPLATE OF6866-G

WIDTHCOIL

E(9116E.V.E

II

IS II

NEW CIRCUIT

TO PHASEDETECTOR

40 TURNS OF NO.30 WIREWOUND AROUND WIDTH COIL

width coil, and connect the two endsof this coil between ground andphase detector input. If the picture isfound to be out of phase, reverse thetwo coil leads, and you're back inbusiness. There is now much lessdanger of subsequent break -downof the unit, because it is no longerexposed to pulse voltages as highas in the original set-up.-JohnBurisin, McKees Rocks, Pa.

Technical new products on pgs.

30, 32, 34, 36, 38, 40, 42, 44, 61

Horizontal Instability

The complaint on this Hoffman196 chassis was horizontal instabil-ity. The trouble became evidentonly after the set had been in op-eration for an hour or two. Thetrouble appeared for a short timeonly; observation showed the re-ceiver to be functioning normallyat all other times.

After extensive tests, it was foundsymptoms appeared only when thechassis was left in its cabinet. It wastherefore decided to experimentwith a little heat, since the compo-nent at fault was evidently break-ing down under some sort of stress,and more than likely heat was re-sponsible. The first spot picked forbeaming the heat lamp produced thenecessary results and the set beganto act up. With the aid of the scope,the defective part came to light.C-716, a 47 mmfd-1500 v ceramiccapacitor (see schematic) had fi-nally open -circuited, it seemed, as aresult of the excessive heat from thelamp.

C-716 is connected to a tap onthe horizontal output transformer.Positive -going keying pulses are ap-plied to the plate of the keyed agctube through this condenser. Withcapacitor C-716 open, it can be read-ily seen that horizontal instabilitywill be produced.

Identical trouble was encounteredin a number of other Hoffman sets;replacement of the capacitor inquestion has eliminated the symp-toms in all cases encountered so far.-Walter Fernald, Waco, Texas


Reps & Distributors

J. W. MARSH CO., Los Angeles, hasbeen appointed sales reps for CLEARBEAM ANTENNA CORP. for the statesof Calif., Nev. and Ariz.

FRED SPELLMAN has been ap-pointed rep for industrial accounts inthe greater N. Y. area for JENSENMFG. CO., Chicago, Ill.

EDWARD HOFFMAN has been ap-pointed sales rep for ERIE RESISTORCORP., Erie, Penna. He will representtheir electronic div. in Minn. and N. &S. Dakota.

COLUMBIA WIRE & SUPPLY CO.,Chicago, announces the appointment ofJAMES W. ECKERSLEY to representthem in Ore., Wash., Ind. and Alaska.

WILLIAM J. PURDY CO., San Fran-cisco has been appointed by MERITCOIL & TRANSFORMER CORP., Chi-cago to represent them in the SanFrancisco area.

CRESCENT INDUSTRIES, INC., Chi-cago announces the appointment of JAYNIERENBERG and L. D. LOWERY,INC. as representatives in two Easternsales territories.

CARTER MOTOR CO., Chicago hasappointed HYDE SALES CO. as theirrepresentatives in Colo. and New Mex-ico.

PEERLESS PRODUCTS INDUS-TRIES, Chicago has appointed the R. J.GIBBONS ELECTRON SALES CO. ofMiami, Fla. as exclusive sales rep for itsantenna sales in the state of Fla.

CLAROSTAT MFG. CO., Dover, N. H.has nominated BILL KOLANS & CO. ofS. San Francisco to represent them inN. Calif.

THE NORTHWEST CHAPTER of theNational Electronic Distributors Assoc.held the first quarterly meeting of 1955in the Spokane Club, Spokane, Wash.. . . THE EMPIRE STATE CHAPTERwelcomed ROBERT C. SAMPSON ofRadio Corp. of America as their guestspeaker at the meeting of Feb. 23 inAlbany, N. Y.

BENDIX OPENS SALES DRIVE. Anew sales program called the "BendixSelling Bee," scheduled to run fromJan. 15 through April 15, has been in-augurated by the TV and broadcast re-ceiver divisions of BENDIX AVIATIONCORP., Baltimore. The selling beetheme will be carried out in a series ofmailings directly to the home of eachsalesman.

CHANNEL MASTER CORP., Ellen-ville, N. Y., has announced the appoint-ment of four new distributors: C & 0ELECTRONICS, Monroe, La., STAND-ARD ELECTRONIC DISTS., Harris-burg, Ill., CENTRAL MO. DIST. CO.,Moberly, Mo., WABASH ELECTRON-ICS, Mt. Carmel, Ill.

ALL -STEEL

INTERLOCKING

Perfect for storing easily lost, easily -scram-bled small parts! Precision -made all -steeldrawers finished in two-tone green enamel,complete with cord holder. Priced at 42ceach in the small size (illus.), or $1.28 forlarge size.

MAKE CABINETSUnits interlock easily attop, bottom, sides to formrigid cabinets -assembleto fit any space! No frame-work required.

DEALERS -JOBBERS!Once again, enough steel is available to makepopular Multi -Drawers available to new dealers!Jobber territories open.

WRITE TODAY TO DEPT. C FOR DETAILS

THE CINCINNATIVENTILATING CO. INCTHIRD & MADISON STS., COVINGTON, KY.

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SKY ROCKETAntenna

Sky Rocket is a broad band inline yogiaffording high gain in a compact design.It Is a tonal performer, permittingdeeper penetration of fringe areas. Hasnew click -rig element clamps with nonuts to tighten. Just unfold and theylock in place automatically. Mail couponfor details.

NEAL ELECTRONIC COMPANY, INC.1037 Hall St., Huntsville, Alabama

Send prices and other details.

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Zone

NEW STOCK OF FIR ST QUALITYTELTRON TUBES

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This Elco Tube Tester isyours FREE when you buy$199 worth of tubes ormore within 60 days atTeltron.May be bought outrightfrom Teltron for $34.95.

TYPE PRICE TYPE PRICE TYPE PRICE TYPE PRICE

1A7GT .53 6/185 .96 6F5GT .44 12AL5 .481H5GT .51 6A05 .48 6H6 .50 1284 .72114 .51 6AR5 .48 615GT .49 128A7 .581L6 .51 6AT6 .37 616 .61 128H7 .611106 .49 6AU5GT .60 6L6 .78 12811 .651N5GT .51 6AV5GT .60 607 .40,12827 .631R5 .51 6AV6 .37 6S4 .41 12K7 .401U4 .51 6AX5GT .60 6SA7GT .45 12SA7 .45105 .43 611/16 .56 601161 .65 1201761 .601X2 .65 6BA7 .58 6SK7GT .45 12'N7GT .552A3 .35 68C5 .48 6SL7GT .60 12SK7 .452A7 .35 68E6 .46 6SN7GT .60 1247 .38304 .53 68F5 .48 6T8 .71 198666 1.483Q5GT .61 6BF6 .48 6V3 .80 1918 .713S4 .48 611G66 1.18 6V6GT .48 2580661 .823V4 .48 681(5 .75 6W6GT .53 2525 .555Y4G .49 611.16 .51 6X4 .37 2526GT .365Y3GT .30 6886 .51 6X5GT .38 3585 .485Y4G .40 613K7 .78 688 .80 35C5 .48523 .42 6817G1 .78 7F8 .49 35W4 .336A8 .40 6886 .90 12AL5 .43 35Y4 .426AL5 .43 6807 .85 12AT6 .37 352561 .336K7 .40 6BY5G .60 12A06 .43 50A5 .496A84 .43 6827 .95 12AV6 .42 5085 .486AF4 1.02 6C4 .41 12AV7 .73 5005 .486AG5 .52 6CD6G 1.63 12AX4GT .60 11723 .336AH4GT .65 6CU6 .95 12AX7 .61 11726GT .6565J5 .96 6F6 .42 12A27 .65

SPECIALS! Till April 1st1B3GT .55 6507 .

1T4 .47 608 .695U4G .38 6W4GT .356AC7 .59 787 .486AU6 .34 12AT7 .676AX4GT .54 12AU7 .526306GT .73 2516GT .37

6K6GT .35 TYPE 80 .36

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48 Hour PostalDelivery TcWest Coast

TERMS: Save all freight andpostage charges All ordersamompanied by full remit-tance will be shipped POST-AGE PAID anywhere in thecontinental U.S.A 25% de-posit required on C.O.D.'s.$1.00 handling charge onorders under $10.00. Openaccounts to rated firms only.

TELTRON ELECTRIC COMPANYDEPT.T-3 428 Harrison Ave , Harrison, N.J. Humboldt

4-1848


News of Industry


EDWARD BERLIANT has acquiredcontrol of INSTRUMENTS FOR SERV-ICE, INC., Baldwin, L. I., N. Y., mfrs ofthe "Cap -Check" capacitor checker.

PRESENTATION OF THE HALFMILLIONTH ANTENNA manufacturedat the CLEAR BEAM plant, CanogaPark, Calif. was made to entertainerand honorary mayor of Canoga Park,Bob Burns. Presentation was made byHarold Florence, pres. of CLEARBEAM.

TUBE & TOOL TENDER FREE, with32 premium tokens-one token beinggiven for every 25 SYLVANIA re-ceiving tubes-of any type-boughtbetween Jan. 1st and March 31st. Seeyour SYLVANIA distributor.

FUSIBLE RESISTORS. The fusibleresistors used in new model TV sets canbe replaced with the new Model R7WTV fusible resistor. WORKMAN TV,Teaneck, N. J. is packaging the resis-tors and pins in polyethylene envelopeson 11" x 14" display cards.

PLANS FOR NEW PYRAMID PLANT

Wm. J. Slawson, asst. jobber sales mgr. forPyramid Electric Co., N. Bergen, N. J., andJack J. Poff, jobber sales mgr., look overplans for the 27,000 sq. ft. plant addition.

M. W. BERNS, pres. of ROBURNAGENCIES, INC., export representa-tives for SNYDER MFG. CO., and BENSNYDER, head of the auto and TV an-tenna mfg. firm will tour Puerto Ricoand Cuba late this winter to study thepossibility of establishing mfg. branchesthere, Mr. Snyder announced.

GEO. MILLER, pres. of VIDAIREELECTRONICS MFG. CORP., 576 W.Merrick Rd., Lynbrook, N. Y. haspurchased all outstanding shares in thecorporation. Mr. JOSEPH DE ROSA isno longer connected with the corpora-tion.

MARK SIMPSON MFG. CO. LongIsland City, N. Y. is reorganizing theengineering dept. in order to facilitateits program of developing new inter-coms and amplifiers, according toMiryam Simpson, vice-pres. Under thenew setup, Joseph Rice is asst. chiefengineer and William Lipson is coordi-nating engineer, both working underTorulf Aasen, chief engineer.

RAYTHEON CONSTRUCTIONAHEAD OF SCHEDULE on Waylandlaboratory. The new electronics engi-neering and research laboratory atWayland has moved into the secondplanned stage of construction. Theoriginal section of approximately 145,000sq. ft. will be augmented by a secondsection of 80,000 sq. ft.

JERSEY SPECIALTY CONTEST

A sales contest among distributors, dealersand TV service associations will be laurcheaMarch 10th, ending in August, by JerseySpecialty Co., Mountain View, N. J. L. toR. Wm. Hagedoorn, Peter Hagedoorn, pres.,Vincent Sullivan 1NY Daily Newsl andJ. W. Wilson (Citadel Press) scanningmarkets being covered by the contest.

NEW PACKAGING PROGRAM. Aplan to eliminate jobber stocking prob-lems and speed up service to countertrade has been adopted by BELDENMFG. CO., Chicago, Ill. Under the newarrangement, heavier cables normallystocked only on large 500 or 1,000 ft.spools will be available in handy pack-aged 100 ft. lengths. However, theselengths will run continuously in theover-all merchandising carton so thatany desired continuous length may bepurchased.

JAVEX of Redlands, Calif. announcesa new anniversary gift. It is a displaycase 14" wide, 14" high by 24" long andis constructed of birch trimmed withpicture frame maple. The case is avail-able free by purchasing $50.00 worth ofJAVEX merchandise plus the displaymerchandise enclosed in the case ($7.40net).

CBS-HYTRON, Danvers, Mass. an-nounced the inauguration of TV picturetube warehousing facilities in Dallas,Tex.

TRADE-IN SYSTEM LAUNCHEDBY HAYDU BROS. ARTHUR SHES-SER, sales mgr. for HAYDU BROS.,Plainfield, N. J., is keynoting the salespromotion and advertising for his com-pany's share of the 1955 replacementpicture tube market around the theme"Trade -In System." Essence of this sys-tem is the increased volume dealers andjobbers will experience by acceptingused TV tubes as credit toward thepurchase of processed HAYDU tubes.

STROMBERG-CARLSON, Rochester,N. Y., unveiled its new 1955 TV modelsat an Eastern Div. convention held atthe Mayflower Hotel, Washington, D. C.for the company's radio and TV dis-tributors.

WASHINGTON, D. C. BENJAMIN S.HAMILTON, electronics teacher at SanDiego Junior College, was named as thecountry's top-ranking amateur radiooperator. He will receive GE's EdisonRadio Amateur Award for the out-standing public service of 1954 by a"Ham" operator.

RAYFORD E. NUGENT has been ap-pointed gen. sales mgr. of the parts andaccessories div. of PHILCO CORP.,Philadelphia. . . . WILLIAM J. HORNwas appointed merchandising and ad-vertising mgr. of same division.

ZENITH INTRODUCES "TRENDLINE." The newest 1955 ZENITH"TREND LINE" TV receiver was pre-sented to dealers at an open houseshowing at the showrooms of the NewJersey Div., ZENITH RADIO CORP.of N. Y.

ANDERSON-O'DONNELL CO., Den-ver, Colo., has been appointed salesagent for STROMBERG-CARLSON ra-dio & TV products. They will cover theRocky Mountain area.

JAMES VIBRAPOWER CO., Chicago,Ill. has introduced a new vibratordealer -labelling program to the dis-tributor market, John A. Kennedy, pres.announced recently. This merchandis-ing program allows the dealer to labelhis own vibrator components thltsproviding rapid identification by adealer of his own service work, Mr.Kennedy said.

A NEW LINE OF DuMONT TV RE-CEIVERS with custom-made cabinets,for sale in limited quantities in theMetropolitan New York market, wasannounced by Philip Geth, pres. ofDuMONT NEW YORK, INC. The newline will be known as the "Signature"series.

HEPPNER MFG. CO., Round Lake,Ill. has added an additional 10,000 sq. ft.of plant area to the present factory. Thenew section will house the enlargedtool, die and punch press depts.

"I'm listening to a trio of girls and they allsing so beautifully together."


New Product BriefsTV 'SILENCER": Kit containing 2 head-phones, an extension wire reel withplug-in receptacles taking up to 4 head-sets, and a unit for connecting the reelwire to the TV set. $14.95. EdwardFleming Inc., Broad St., Westport, Conn.-TECHNICIAN (Ask for No. 3-50)

BRAKE: Angles, brackets, channels, radioor TV chassis or boxes can be formedwith the A.B. Parker Sheet MetalFolder. Bends aluminum, copper, brassor steel up to 18 gauge by 24 in. $14.95.Television Accessories Co., Dept. 88,Box 6001, Arlington 6, Va.-TECH-NICIAN (Ask for No. 3-51)

TRANSFORMERS: Line to speaker match-ing transformers for commercial soundsystems utilizing 70 v. distributiontechniques are available in 3 sizes, forspeakers requiring 5, 15 or 50 watts.Efficiency is 90-95%. Electronic Com-munication Equipment Co., 1249 W.Loyola Ave., Chicago 26, ni.-TECH-NICIAN (Ask for No. 3-52)

VISE: "Float -Lock Mity 7" is claimed toprovide the most versatile grip of anyvise on the market: holds the workequally well in all positions. All -steelconstruction. $9.98. Float -Lock Corp.,AMF Co., AMF Bldg., 261 Madison Ave.,N.Y. 16-TECHNICIAN (Ask for No.3-53)

MICROPHONE: Type B110 microphone hasa response of 30 to 13,000 cps, flat from30 to 1,000 cps, with a 20 db peak at4,000 cps. Output level, working into 5megohm load is 1 inv/Ithar. Recom-mended for communications work, PA.and paging systems. $7.95. RonetteAcoustical Corp., 135 Front St., N.Y. 5-TECHNICIAN (Ask for No. 3-54)

MOTOR -ALTERNATOR: Model HA -2 motor -alternator features 2 -phase, 30 cps out-put at 18.5 v. Power output is equiva-lent to 2.7 watts from the shaft and 1.37watts for electrical power. Synchronousoperation; dynamically balanced rotorson common shaft. Electric Motors andSpecialties Inc., King and Hamsher Sts.,Garrett, Ind.-TECHNICIAN (Ask forNo. 3-55)

RESISTANCE NETWORKS: Hermeticallysealed resistance and resistance -capac-itance networks can be supplied withresistance values to ±.02% and tem-perature coefficients matched to within±3 parts per million /°C. Plug-in orsolder terminals. The Daven Co., Dept.RE, 191 Central Ave., Newark 4, N.J.-TECHNICIAN (Ask for No. 3-56)

SOLDERING GUN TIPS: Two new accessorytips for Weller guns are announced; theCutting Tip, a knife -like blade, and theSmoothing Tip, a trowel shaped edge.Special alloy, heavily plated. 504 each.Weller Electric Corp., 808 Packer St.,Easton, Pa.-TECHNICIAN (Ask forNo. 3-57)

VARIABLE CAPACITOR: New miniature, 2 -section variable condenser designed es-pecially for transistorized radio receiv-ers. Low values of tuning capacitance.Radio Condenser Co., Davis & Cope -wood Sts., Camden, N.J.-TECHNI-CIAN (Ask for No. 3-58)

EXCITER UNIT: Model 504C Multi -BandFrequency Multiplier covers the 80 to10 meter bands with a nominal poweroutput of 25 watts. Broad -band typeamplifiers. Four 6AQ5's make up themultiplier string. Barker & Williamson '

Inc., 237 Fairfield Ave., Upper Darby,Pa.-TECHNICIAN (Ask for No. 3-59)

ORDER BOOK: New Television -Radio Re-pair order book is designed to help thetechnician in listing labor costs, bill ofmaterial, type and model of radio or TVset and all pertinent information. Elec-tronic Publishing Co., Inc., 180 N. Wac-ker Drive., Chicago-TECHNICIAN(Ask for No. 3-60)

CONTROLS: Series 47 composition -ele-ment controls are now available withthe twist -tab mounting feature, elimi-nating the need for bushings, mountingnuts and lock washers. Available withor without switches. Clarostat Mfg. Co.,Inc., Dover, N.H.-TECHNICIAN (Askfor No. 3-61)

RESISTORS: Types GM and HM copperclad fixed composition resistors aremarketed in combination with copperclamps or supports so that they can bemounted directly on metal chassis orpanels. Copper supports provide rigidmounting and efficient heat transferfrom the resistors to the metal chassis.Allen-Bradley Co., 136 W. GreenfieldAve., Milwaukee 4, Wis.-TECHNICIAN(Ask for No. 3-62)

RESISTORS: "Akra-Ohm" ceramic -bobbinprecision wire wound resistors areavailable from .1 ohm to 1000 megohms,75 to 2000 v. and .1- to 2 -watt. Radial oraxial lead, radial or axial lug, or brac-ket -type mountings. Shallcross Mfg.Co., 520 Pusey St., Collingdale, Pa.-TECHNICIAN (Ask for No. 3-63)

AMPLIFIERS: Packaged circuit plug-inaudio amplifiers, "Pakaps," utilize cir-cuits etched on impregnated teflon. Flatresponse, 20 cps to 40 Ice. In 3 models,for 20, 40 and 60 db amplification. AudioProducts Corp., 2265 Westwood Blvd.,Los Angeles 64, Calif.-TECHNICIAN(Ask for No. 3-64)


6 MORE NEW

TRIAD

*CORRECT

REPLACEMENTFLYBACKS

These new flybacks are mechanically correctand electrically correct ruggedized versionsof manufacturer's items - precisely engi-neered by TRIAD for specific makes andmodels-to give exceptionally high perform-ance and long, trouble -free service.

6;45 List Price $10.00'Correct Replacementfor Zenith S-20908,S-:5911, S-15912,S-16566, S-17130,S-17140, S-17233,S-17245, S-17265,S-17435, S-17646,S-17767, S-17811,S-17927, S-18930.

D-46 List Price $10.50'Correct Replacementfor Muntz T0-0031TC-0031-1, T0-0031-2.

D-47 List Price $10.50'Correct Replacementfor Muntz TO -0036,T0.0036-1, T0-0036-2.

0-48 List Price $8.25'Correct Replacementfor Crosley 158481.1,187820-5-1; Sentinel20E995; Hallicrafter55D251, 550253.

11.49 List Price $8.25'Correct Replacementfor Admiral 79C60-2,79C60-3, 79C60-5.

55 List Price $11.00'Correct Replacementfor RCA 21115.Voltage doubler type.

111. -

WRITE FOR FREE LITERATURE

Triad 'CR Transformers arelisted in Sams Photofactfolders and Counterfacts.

4055 Redwood Ave. Venice, Calif.


Complete Index of

ALL "CIRCUIT DIGESTS" TO DATEIncluding Current Issue. CIRCUIT DIGEST NOS. 179 to 184 will be found in

All Units Are TV Rec e iUnless Otherwise Noted

ADMIRAL Circuit Digest No.Chassis 2242: Models 620M15, 620M16, 620MI7.Chassis 22A2A: Models 620M11. 620M12. Chas-sis 22M1: Models 121M10, 1211)111A, 121M12A,121M11. 121M12, 121K16A, 121K16A, 121K17A,1211(16. 1211(16, 1211(17. 221K45A, 221K46A.221K47A, 221K45, 2211(46, 2211(47. Chassis22Y1: Models 3213125A, 821M26A, 3213127A,321M25, 321M26. 821M27, 42111115A, 421M16A,421M15. 421M16, 421M36, 421M36, 421M37,5213115A, 5211416A, 6215117A, 521M15. 6215116.52IM17

1

Chassis 19B1: Model 17DX10, 17DX11. Chas-sis 19C1: Model 121DX12, 121DX16, 221DX15,221DX16, 221DX17, 221DX26, 221DX38. Chassis19F1A: Model 121DX11. Chassis 19H1: Model222DX16 15Chassis 22A3. 22A3Z: Models 122DX12, 222DX-156, 222DX17B, 222UDX15. 222U-DX16, 222UDX17, 222DX27B, 322DX16A, 322-UDX16 101Chassis 20A2, 20A2Z, 20D2 111Chassis 20L2: Models TA2216A, TA -2217A,CA2236A, FA2226 134Chassis 21A3Z: Models T2311Z (Coral Gables),T2312Z (Bell -Aire), T2316Z (Beverly Hills).T2317Z (Bermuda), T2318Z (Bar Harbor).C2316Z (Catalina). C2317Z (Casablanca),C2326Z (Del -Monte), C2327Z (California).F2326Z (El Dorado), F2827Z (Riviera), F2328Z(Deauville) 142Chassis 20AX5, 20AX6A, 20AX6CZ, 20AX51),20AX5EZ,20AX5F: Models TA1831. TA1832,TA1842. CA2256. TA221211, CA2306Z, CA2307Z,TA1812B 161Chassis 17XP3: Models T1801 (Pasadena).T1802 (Palm Beach), T1806 (Palm Springs),T1807 (Palo Alto) 168ANDREAChassis VM21 : Models T-VM21, C-VM21, 2C-VM21, CO -V3121 44ARVINChassis TE331: Models 6175TM, 6179TM 13Chassis 337-341: Models 7210, 7212. 7214, 7216.7218, 7219 45TV Dual Tuner. used in Chassis TE 330. 332,340. 341 75Chassis TE 369: 9200 series 100Chassis TE 373 -UHF: Model 9246 128Chassis "D" 379 -UHF, "D" 1382 -VHF: Models21-560, 551. 562. 663 150Chassis "E" 383 -VHF: Models 21-544,555.557 1 74BENDIXChassis T14: Models 211E3, 21KD, 21T3. 21X3,OAKS 20Chassis T17 Models KS21C, TS21C. ChassisTI7-1: Model TS17C 50Chassis T14-3: Models FM27C, HB27C. ChassisT14-10: Models TM24DS, TB24DS. ChassisT14-11: Models TM24DU, TB24DU 116Chassis T14-16, T14-16 144CAPEHARTChassis CX-36. RF-IF chassis coded Ft -3, De-flection chassis coded D-4: Models 1T172M,2C172M. 3C212311, 322126, 4H212311, B, 5F212M,6F212111, B. 7F21216, 8F212B, 9F212M, 12F272M,10W212M, 11W212M 17Chassis CX-37: Models 1T172MA. 1T17211A.SC212MA, 8C212MG, 3C212BA, 4H212MA.4H212F1A, 5F212MA. 6F213B, 7F212MA, 8F212 -BA, 9F212MA, IlW212MA, 1C21311. 2F213E,3C213M. 4'7213M. 4T213B, 5H213M, 8F213B 37Chassis CX-117 and CX-37-1, 1956 series 151Chassis "CX-38" series 179CBS -COLUMBIAChassis 817: Model 17T18, 17M18, 17C18.Chassis 820: Models 20T18, 20M18, 20M28 14Chassis 1027: Models 27C11. 27C21 77Chassis 760-3: Models 17M06, 22C06.22C38 95Chassis 921-11: Models U22C05, U22C07.U22C07B, U22T09, U22T09B, U22T09EB. Chas-sis 921-13: Models U22T19. U22TI9B. Chassis921-141 Models 22C09, 22C09B, 22T19B 145Models 205C1. 206C2 (Color Receiver) 167COLUMBIA RECORDS360 Phono AmplifierClOSLEYChassis 850: Models EU-17COM, EU-17TOB,EU-117TOM. Chassis 381: Models EU-21CDB,EU-21CDM, EU-21CDN, EU-21C0Be. EU-21-COMs 2V117 Chassis 392: Models EU-COM:Ia.

43

Circuit Digest No.21COBUa, 21C135EU, 21CDBU. 21CDNU(Chassis 392 is very similar to the 380-referto Circuit Digest No. 21Chassis 388: Models EU-3000MU, 3000BU

33Chassis 393: Models EU-21TOLU. EU-21-TOLBU. Chassis 394: Models EU-21COLU,EU-21COLBU 46Chassis 402: Models F-17TOLH, F-17TOLBH;Chassis 403: Models F-21TOLH, F-21TOLBH:Chassis 404: Models F-21COLH, F-21COLBILF-21CDLH, F-21CDLBH: Chassis 402-1: Mod-els F-17TOLU, F-17TOLBU ; Chassis 403-1:Models F-21TOLU, F-21TOLBU ; Chassis 404-1:Models F-21COLU, F-21COLBU, F-21CDLU,F-21CDLBU 82Chassis 411: Models F-24COLH, F-24COLBH;Chassis 411-1: Models F-24COLU,F-24COLBU 96Chassis 412: Models F-24CDMH, F24CDBILChassis 412-1: Models F-24CDMU, F-24CDBU,Chassis 416: Models F-27COMH, F-27COBH.Chassis 416-1: Models F-27COMU, F-27COBU

106Chassis 426: Models G-17TOMH, G-17TOBH,G-17TOWH 126Chassis 431-2: Models li-21COMIL H-21COBH.H-21COWIL H-21COSIL H-21COSBH, H -21 -HUM, H-21HCWH, H-21COMU, H-21COBU,H-21COWU, H-21HCBU, H-2IHCMU 163Chassis 434: Models H-21TOMHb, H-21TOBHb,H-21TOWHb, H-21HCMHb, H-21HCBHb, H-2:-HCWHb, H-21COSHb, H-21COSBHb, H-21CO-MHb, 11-21C0131113, H-21C0WHI3 176DELCOBuick Selectronic Model 981551 (see main sec-tion of magazine) 149DE WALDModels ET -140R, DT -163R, DT -163A. ET -170,ET -171. ET -172, ET -191. DT -190D 69DU MONTChassis RA -164: Model Clinton. Chassis RA -166: Models Beverly, Ridgewood. Shelbourne,Milford. Wakefield 3Chassis RA -166/167. 170/171: Models I7T350,21T327. 21T328. 21T329, 21T359. 21T366.21T376. 21T377. 2IT378 51Chassis RA -306, 807: Models Summit RA -806A1& RA -307A1, Warren RA -306A2 & RA -807A2,Hampton RA -306A3 & RA307A3, Bristol RA -306A4 & RA307A4. Newport RA -306A6 & RA -307A5, Rutland RA -306A6 & RA -307A6. Hart-ford RA -306A7 & RA307A7, Sheffield RA -306A8& RA -307A8. Westbrook RA -306A9 a RA -307A9, Windsor RA -306A10 & RA -807A10.Bradford RA -306A11 & RA -307A11, WarwickRA-306Al2 & RA307Al2 107

Circuit Digest Numbers

1- 8 Sept. 19529- 16 Oct. 195 2

17- 24 Nov. 195225- 30 Dec. 195231- 36 Jan. 195337- 43 Feb. 195344- 49 Mar. 195350- 58 Apr. 195359- 64 May 195365- 70 June 195371- 76 July 195377- 81 Aug. 195382- 88 Sept. 195389- 94 Oct. 195395-100 Nov. 1953

101-105 Dec. 1953106-110 Jan. 1954111-115 Feb. 1954116-120 Mar. 1954121-125 Apr. 1954126-130 May 1954131-133 June 1954134-138 July 1954139-143 Aug. 1954144-149 Sept. 1954150-155 Oct. 1954156-161 Nov. 1954162-167 Dec. 1954168-1 7 3 Jan. 1955174-178 Feb. 1955179-184 Mar. 1955

this issue of TECHNICIAN.

Circuit Digest his_

Chassis RA -301. 302; Models RA -301-A1, RA -301 -A2. RA -301-A3, RA -302-A1, RA -302-A2.RA -302-A3 120Chassis TA -312, 313: Models Barton, RA -312-A1, or RA -318-A1; Baylor, RA312-A2 or RA -313 -A2; Winsted, RA312-A3 or RA313-A3;Clifford, RA -312-A4 or RA -313-A4; Hamilton.RA -312-A6 or RA -313-A6; Dellwood, RA -1112-A6or RA -318-A6; Richfield, RA -312-A7 or RA -313-A7 ; Belvidere, RA -312-A8 or RA -313-A8 ; Brad-ley, RA -812-A9 or RA -813.-A9 139Chassis RA -321, 322: Model The Glendale 170EMERSONChassis 120166-D: Models 721D, 728D 10Chassis 120168-D: Models 716F, 717F. 719F.727D. Chassis 120169-B: Models 711F, 712F.720D, 732B. 73413 31Chassis 120174-B: Models 762A, 755A, 784A:Chassis 120198-D: Models 753F, 786C, 786E 91Chassis 120182-D: Models 741F. 757D. 768F.Chassis 120196-B: Model 781A. Chassis120206-D: Models 792D, 781E. Chassis 120197-B:Models 784E, 784K. Chassis 120197-D: Model784G. Chassis 120196-D: Models 786K. 769C.Chassis 120211-D: Model 784M 121Chassis 120220-D: Models 1030D, 1032D. Chas-sis 120239-D: Models 1058D, 1060D, 1062D,1064D 1 52Chassis 120233-D: Models 1066D, 1070D. 1072D.Chassis 120235-D: Models 100014. 100211. 1004H,1006H, 1008H, 101011 1018H, 1022H, I028H,104011, 104214, 10740, 1084D, 10440. 1046D.1048D, 10640, 1086D, 1088D. 109013. 10920.Chassis 120234-D: Models 1067D, 1071D. Chassis12143,-1). Models loo9J. 1511J, 10751), 1047D.1049D. Chassis 120238-F: Models 1041F. 1045F,10471 162ESPEY613-C AM -FM Tuner 70FADAThe "Imperial" Series: Models 17T6. 17T9,1702, I7C4 25Models U2100C, U2150C, U2100T, UDL2100T,UH21T 83GENERAL ELECTRIC"Stratopower" chassis: Models 17C125. 20C107,21T1, 21C208, 21C204. 21C201. 21C202, 21C214.21C206 4UHF -TUNER Model UHF -108 52"F" Chassis: Models 17C127, 21T14. 21C116.21C116, 21C117, 21C119, 21C120. 21C121. 17T16.21T10. 21T12, 21T4 84UHF Tuner, Model S -UHF -80 104Chassis "EE": Models 2171. 2111. 21T20.21T21. 21C226. 21C226. 21C227. 21C228. 21C229.21C230, 21C231, 21C232. 21C233 113Chassis "G" line: Models 17T20, 21T22, 21T23,21T24. 21T25, 21C103 and 11C104 135Chassis "H" line: Models 21T26 -T27, 21C240-

ChassisC241 line: Models 21C106 -C107 -C110486-C109. 21T32 -T33 -T36 -T37 180GRANCOUHF Converter Model CTU

HALLICRAFTERSChassis A1200D, 11(1200D or W1200D: Models1010P. 1012P. Chassis D1200D. L1200D orXI200D: Models 1021P, 1026P. Chassis F1200D:Model 1013C. Chassis G12000: Models 1022C.1027C. Chassis U1200D: Model 1066C. ChassisT1200D: Models 1061P, 1066C, 1066C, 1060C,1061C. Chassis P1200D: Model 1052P. ChassisR1200D: Models 1053P, 1054P. Chassis P1200D:Models 1067C, 1062C. 1063C. Chassis Z1200D:Model 1067U 21Chassis A1300D: Model 1075 38Model TW-1000 World -Wide 8 -Band PortableRadio 49Chassis A1400D: Models 21K20113, 211[21111.21K221B, 21K231M 102Chassis B1600D: Models 21T320W, 21T-32051.21T320B, 21K33011, 211330MHOFFMAN Circuit Digest 113.Chassis 213: Models 21M903. 2113904, 21P906 32Chassis 403-24: Models 24M725, 2413726, 24P727

74

92Chassis 406-21: Models 2111160, 21B161,21M333, 21B334 130Chassis 407-21: Models 21M178, 21B179, 21P180.21M345, 21B346 156Chassis 306-21: Models 21M176S, 21M175C2,21131765, 2113176C2, 21P1775. 21P177C2, 11M-183. 218184. Chassis 308-21: Models 21M183P.21M1313P2. 2113184P, 2113184P2. 21M357P,



COMING

IN MAY..

RIDER

TElEvISIONMANUAL

NAN 1441,4

RIDER'STV 15 !

LIMITED PRINTING -

tell your jobber to

resettle your copy now!

only

ADVERTISERS INDEX

MARCH, 1955

Aerovox Corp. 41

Caldwell -Clements, Inc. 43Centralab Div., Globe Union, Inc. 55Channel Master Corp. 8, 9Chicago Industrial Instrument Co. ... 51Cincinnati Ventilating Co., Inc. 59Clear Beam Antenna Corp 50Cornell-Dubilier Electric Corp. 11, 53, 63

Delco Radio Div., General MotorsCorp. 5

DuMont Laboratories, Inc.,Allen 8. 33

Elfin Manufacturing Co.Erie Resistor Corp.

.... 53. 57

Finney Co. 2, 3

General Cement Manufacturing Co. 4

Hycon Manufacturing Co. 39

International Resistance Co. Cover 2

Koster Solder Co. S5

Mallory & Co., Inc., P. R. 37Moss Electronic Distributing Co. 57

Neal Electronics Corp. $9

Pyramid Electric Co. 10

Rad-Tel Tu3e Co. 52Radiart Corp. 11Radio Corporation of America .. Cover 4Radio Merchandise Sales 49Raytheon Manufacturing Co. 12Rider Publisher, Inc., John F 63

Sarkes Tarzian, Inc. 6Sonotone Corp. 45Sprague Products Co Cover 3Standard Coil Products Co., Inc. .... 28Sylvania E ectric Products Inc.

. . 31

Teltron Tube Co. 59Triad Transformer Corp. 61Tung -Sol Electric Inc. . 46, 47

Weller Electric Corp. 48Westinghouse Electric Corp. 7, 51Winegard Co. 35

While every precaution is taken to insureaccuracy, we cannot guarantee againstthe possibility of an occasional change oromission in the preparation of this Index.

in ceramics

DISCTUBULAR

PRINTEDCIRCUIT

you can see why C -Dis always the leader

THE ONLY CERAMIC WITH

THE MILLION -DOLLAR BODYC -D Ceramic Capacitors are madefrom beginning to end under oneroof in a huge plant devotedcompletely to ceramic capacitorproduction. Every process ... everyingredient is under constantcontrol. You can see the reasons forC -D's outstanding superior quality.And to help you C -DCeramic Capacitors areC -D packaged incompact, crystal-clear, /II:easy to handle andalways usable plastic /boxes (no extracharge). That'swhy Distributorswho know carrythe complete C -Dline. See yourC -D distributortoday! He's inyour ClassifiedTelephoneDirectory.

ONSISTENTLY

NELLDUBILIER-

THERE ARE MORE C -DCAPACITORS IN USE TODAYTHAN ANY OTHER MAKE.

PLANTS IN NO. PLAINFIELD. N. J4 NEW REDIORD. WORCESTER AND

CANORINOE. NAGS.; PROVIDENCE AND NOPC VALLEY. . I.; imom.vetn.

INS., m14,01.0 AND POONA, SPRINGS, N. C.; SuSI DIARY. RADIANT

CORP.. CLEVELAND. MOO.


(Continued from page 62)21M357P2, 21138581'. 21B358P2 169JACKSONChassis 817A, 320A, 821A. 324A: Models 277217. 221-T. 321-C, 217-T, 317-C, 221-C. 621 64MAGNAVOXModel .7, K-106 Series: CT331, 332, 333, 384.386, 386, 837, 338, 229, 840, 341. 842, 843, 844,346, 846, 847, 848. 849 23UHF Converter Tuner Model 700359 53107 Series: Chassis CT 858 65UHF Converter Tuner 596461 (700859 Re-vised) 80Chassis 108A series: Models CT. CU & CMU401A: CT. CU & CMU 402A; CT. CU & CMU408A ; CT. CU & CMU 404A 1 12Series 106C: Models CT 381C. CU 881C & CMU381C 129Chassis 800 series: Models CTA, CUA &CMUA, 401B: CTA, CUA & CMUA 402B:CTA, CUA & CMUA 403B; CTA, CUA &CMUA 404B 136Chassis 250 series: Models CTA-435AA, CMUA-436AA, CTA436AA, CMUA436AA 157MAJESTICChassis Series 110-111: Models 21T20, 21T21.21C80, 21C81, 21D60, 21D61, 21P60, 21P61,21P62, 21P63, 21P70, 21P71 26Chassis 112: Models 17T38, 17T40, 17T41,17C42, 17C48; Chassis 113: Models 21T40,21T41, 21C42, 21C43 76Chassis 116, 116 Series: Models 21T22, 21T23,21C36 21C37, 21P46. 21P47. 21D54, 21D66.21D57. 21D58, 21D59. 21P64, 21P65. 21P72.21P73, 21PR80, 21PRS1 143MALLORYTV -101 UHF ConverterMOTOROLAChassis TS -292: Models 21C1, 21C113, 21F2.21F2B, 21F3, 21F3B, 21K4, 21K4A. 21K4B,21K4W, 21K5. 21K5B, 21K6, 21K7. ChassisTS -324: Models 21T4A, 21T4EA, 21T5A,21T5BA 9Models TC-101, TC-101B UHF Converters 59Auto Radio Mopar Models 610T 72Chassis WTS-518 Series: Models 21T16, Y21T16.Chassis TS -418 Series: Models 17r20. Y17T20,17T20B, Y17T20B, 17T20E, Y17T2016, 17T20M.Y17T20M.Chassis TS -518 Series: Models 21T16.Y21T16, 21T16B, Y21T1613, 21T16E, Y21T16E.

Y21T17, 21T17B, Y21T17B, 21109.Y21K19, 21K19B, Y21K19B 147Chassis TS -625: Models 21C3A, Y21C3A,21C3BA, Y21C3BA, 21K22A, Y21K22A,21K24A,Y21K24A, 21K27, Y21K27. 21K27B, Y21K27B,211128. Y21K28, 21K28B, Y21K28B, 21T19A,Y21T19A, 21T19BA, Y21T19BA 181MUNTZChassis 17B1 or 17B2: Models 2053A, 2054-A.2056-A, 2056-A. Chassis 1782: Model 2055-B.Chassis 17B8 or 17B4: Models 2467-A, 2461-A.Chassis 17B5 or 17B6: Models 2158-A, 2159-A,2162-A 39OLYMPIC

58

Chassis TK: Models 17T40, 17T48, 17C44,17K41, 17K42, 171150. Chassis TL: Models20T46, 20T47, 20C45. 20052, 20053. 20D49.20K43, 20K51 30Chassis TMTN: Models 17T66. 17C67, 171165,21T58, 21T69, 21T70, 211'74, 21066, 21068,21072. 21C78 21D60, 21D64. 211161, 211162,211163Chassis 14" -AD, 17" -AE: Models14TD31, 17TE37, 17TE38PACIFIC MERCURYChassis 201 SeriesPACKARD-BELLChassis 2720: Models 2721. 2722. ChassisModels 2723, 2724Chassis 2740: Models 2742. 2743, 2744.2843, 2844Chassis T-1: Models 21103, 21202, 21401PHILCORF Chassis 91, Deflection chassis .7-1 used in1968 Code 126: Models 2269, 2270, 2271. 2273,1858. 1858L, 2127, 2266. 2268, 2285. 2286, 2287

5RF Chassis 81, Deflection Chassis H-1:Models 1824. 1825. 1826. 1852. 1862L, 2126,2125L, 2152, 216214 2226, 2227, 2262, 2272.2272L 22R -R chassis 97. Deflection chassis .7-7: Model2750 47All -Speed Record Changer: Model M-24 29R -F Chassis R-201, Deflection Chassis D-201:Models 4808, 4110, 4108, 8104, 4008 89R -F Chassis R-191, Deflection Chassis D-191,Code 140: Models 8002, 4002. 4004. 4102. 4106,4109, 4150, 4802, 4804, 4806. 4807, 4006, 4007.4107, 4112 1 18Chassis 350: Models 22C4016, 22C4016L. 22C-4124, 22C4124L, 22C4126, 2204812, 22C4412 158PHILHARMONIC

Models 54CM21, 54TW21RADIO CRAFTSMENAM -FM Tuner 0-890RAYTHEONChassis 17T1: Model M1733A, C1786A, C1736A.Chassis 17T2: Model M -1734A. Chassis 21T1:Model M -2107A, C -2108A, C -2110A. C -2111A.Chassis 21T2: Model C -2109A 16UHF Tuner 54Chassis 21T8: Models UM -2133, UM -2134, UM -2135, UM -2136. UM -2139, UM -2141, UM -2142,UM -2144, UM -2146 94Chassis 21T11: Models M -2131A, C -2187A andC -2138A 114Chassis 24T3: Models C -2401A. C -2402A 125Chassis 17T18 (Challenger series): ModelsM -1750A, M-17500, M -1750G. M -1750K, M-17511). M -1751F, M -1752E, M -1752L. Chassis21T19 (Challenger series): Models M -2160A.M -2160C, M -2160G, M-216011, M -2161D. M -2161F, M -2162E. 31-2162L 141Chassis Aristocrat series: Models 21T24AS,21T25AS, 21T27AS 182RCA VICTORChassis KCS72: Models 17T200. 17T201, 17T202,17T211, 17T220 6UHF Selector Chassis KCS70: Model U70 42Chassis KCS78 or KCS78B: Models 17-T-801,17 -T -801U. 17-T-302, 17 -T -802U, 17-T-310,17 -T -810U 48UHF Selector Model U2: Chassis KCS79 55Chassis KCS81: Models 21-D-305, 21-D-317.21-D-826, 21-D-827, 21-D-828, 21-D-829. 21-D-330; Chassis KCS81B: Models 21 -D -805U. 21 -D -317U, 21 -D -826U. 21 -D -827U, 21 -D -328U, 21 -D -329U, 21 -D -330U 67Chassis KCS83C: Models 21-S-354, 21-S-362:Chassis KCSS3D: Models 21 -S -354U, 21 -S -362U

90Chassis KCS77D, KCS77H: Models 27 -D -382U.27 -D -383U, 27 -D -3841J 103Chassis KCS84C: Models 24-T-420, 24-T-436:Chassis KCS84E: Models 24 -T -420U, 24 -T -485U

119Chassis CTC2: Model CT -100 (color) 131Chassis KCS88J: Models 21 -S -508U (Arlen).21 -S -504U (Kent), 21 -S -505U (Ellis), 21 -S -506U(Rupert), 21 -S -517U (Consolette), 21 -S -519U(Radnor). 21 -S -521U (Felton), 21 -S -522U (Ben-son), 21 -S -525U (Winter), 21 -S -5251U (Whiter).21 -S -525U (Wister). Chassis KCS88K : Models21 -S -501U (Medalist). 21 -S -602U (Lambert).21 -S -518U (Trafton). Chassis KCS8I1L: Model21 -S -537U (Bromley). Chassis KCS88M: Model21 -S -526U (Carrol). Chassis KCS88VA: Model21 -S -623U (Pickford) 140Chassis KCS87: Models 17-S-450 (Trent). 17-S-451 (Newton). 17-S-458 (Ashburn). ChassisKCS87A: Models 17 -S -450U (Trent). 17 -S -461U(Newton), 17 -S -468U (Ashburn) 154Chassis KCS87C, KCS87D: Models 21-S-600,21 -S -500U 173Chassis Nos. -Main Chassis CTC2B-Conver-gence Chassis CTC3A: Model 21 -CT -55 (Color)

Circuit Digest Ns.172

REGENCYUHF Converter Model RC -600SENTINELChassis 118: Models 454, 1U-454, 465, 1U-465.456, 1U-456, 457, 1U-457 18Models 1U-632, 1U-552, 1U-554 85

68 Models: 1U-581, 1U-582, 1U-684, 1U-585 10814TD30, Models: 111-901, 1U-911, 1U-914. 1U-921,

171 1U-924, 1U-991 159SHERATON

124 Chassis 250XL: Models T1750. T2I60, T1755.T2120, T2155, C2126 81

2710: SPARTON60 Chassis 26D218: Models 6342, 5843, 6882. 6888,

2842. 5384, 5386, 5890, 6891 24117 Chassis 27D218: Models 5842A. 5843A, 6884A.177 5386A, 6382A, 6383A. 10352, 10358 40

Chassis 29U218: Models 22812. 22313, 23322.23323 71Kingston UHF Converter 105Chassis type 23U214: Models 14A204 (Cornell).12A204 and 12A210 (Princeton). 11T210 (Stan-ford) 138STANDARD COILTuner Models TV -1532, TV -2232Model "T" seriesSTEWART-WARNERChassis 9210: Models 9210-C. 21T -9210A,21C -9210C 34Models: 24C -9370A, 24C-9870AB 109Models 17T -9620A. 17T -9620B. 21C -9680C. 21C -9630C13, 21C -9630D, 21T -9680A. 219-9630ABSTROMBERG-CARLSONChassis 421 series: Models 421 TX. 421 CM.421 CDM 19621 Series: Models 521T. 521T0, 621CM.521CDM, 52105M, 521050. 621C6Dee 66

78

178

73

86184

Chassis 621A seriesCircuit Digest No.

110Chassis 21T -22T Series: Models 21TC). 21131.21T5. 21TW. 21TF 165SYLVANIAChassis 1-508-1, 1-608-2: Models 172K, KU.M & MU; 176B, BU, L. LU, M & MU: 176B,BU, I., LU, M & MU; 17713, BU, M & MU178B, BLI. M & MU 12Chassis 1-604-1, 1-504-2: Models 10513, 105BU,106M. 105MU. Chassis 1-510-1, 1410-2: Models120B, 120BIL 120M, 120M1, 126B, 126BU,126L, 126LU, 126M. 126MU 35Chassis 1-509-1, 1-509-2: Models 187B. BU.51, MU 41UHF Converter Models C31M, C32M, C38M 87Chassis 1-518-1. -2. -3: Models 175-18, 372.373, 375, 376. 877 97Chassis 1-614-1, -3, -4: Models All 105-14. 800seriesChassis 1-520-1, -3. -4, -7, 4: Models All 120-20,seriesTRAV-LERChassis 86A2: Models 217-22, 217-33, 220-35,221-36 27Chassis 46A3. 46A4, 46B8: Models 817-44, 817-44A, 817-47, 821-R45. 321-46. 821-48. 321-64.321-55, 821-480, 8210-60. 8210-61 137Chassis 510A4, 511A4 160TRUETONEModel 2D1344AChassis 21T2A: Model 2D1326AMONTGOMERY WARDManual 4107A: Model 25WG-3056AAuto Radio, Model 85BR-6796AModel WG-5000AWEBSTER-CHICAGOWebcor Model 210 Tape RecorderWELLS-GARDNERModels: 321MS81-85A6-386-1, 2321MS31-35A6-388-1 12 3

WESTINGHOUSEChassis V-2207-1: Model H -706T16. ChassisV-2220-1: Model H -708T20 11Model H-808 all channel UHF Tuner 56Chassis V-2208-1: Model H -716T17 63Chassis Assembly V-2238-4; Models H -746K21.H-7471121 78Chassis V-2248-1: Models H -770T21, H -771T21,H -772K21. H -778K21, H -774K21, H -775K21.H -776T21 99Chassis Assembly V-2260-1: Models H -815T24and H -817K24 1 1 5Chassis Assembly V-2268: Models H -830K21,H -831K21 127Chassis V-2313: Models H-888K21B, H -841T21.H -842T21, 11-8481121. H -844K21, 11-8471(21. H-8481121, H -861T21, H -862T21. H -867T21, H -868T21, H -871T21, H -872T21. Chassis V-2328:Models H-841TU21, H-842TU21. 11-843KU21,H-844KU21, H-847KU21, H-848KU21, H-861-TU21, H-862TU21, H-867TU21, H-867TU21A,H-868TU21, H-868TU21A, H-871TU21, H-872-TU21 14 8Chassis V-2315: Models H -882T21 (V), H -882T21 (S), H -883T21 (V), H -883T21 (S),H -884K21 (V), H -884K21 (5), H -885K21 (V),H -885K21 (S), H -886K21 (V), H -886K21 (S),H-8871121 (V), H -887K21 (S). Chassis V-2325:Models H-882TU21. H-883TU21, H-884KU21,H-885KU21, H-S86KU21, H-887KU21 183ZENITHChassis 191122: Models K1812E. K1812R. Chas-sis 191120: Models K1816E, K181511, K1820E,K182011, 111846E, K1846R, 1(1850E, K1850R,K1880R. Chassis 191(28: Models K22295,K2268R, K228611, K2288E. Chassis 211120:Models K2280E, K2280R, K224011. K2240E.K2260R, K2268E, 112266, K226611. K2267E.K2268R, 1122702!, K227011. K22875, K2290R,K2291E 7VHF -UHF Turret Tuner 57Portable Radio Chassis 61.42: Model 1207 79Chassis 22L20: Models 1.2671R, L26725,L2578E. L2674R, 1.2676E, L2692R, 1259311,L2876E. L2876R, 1.28785, L2879E, L2894HU 88Chassis 19L26: Models L1820E or R; L1812Eor R. Chassis 19L28: Models L1846E or A:L2229E or R; 18286E or R; L2236E or R:L2287E or R; L2250E or R; 12258/1 or It :L2262C: L2262R ; 1.2281 or ; 1.22815;L2285 R. Chassis 191.80: Models 1.2237EU orRU. Chassis 191.82: Models 1.22285- Chassis191.34: Models L180OR 122Chassis 20M20. 20M20U: Models M2287R, M-22605, M2261E, 7.12267Y 133Chassis 19520: Models 51800E & R. 51812E &R. Chassis 19R21: Models 11.22291 5, R2230E& R. R2249E & R. 822601 & 5, 12258M,52268E & R 155Chassis 6R60T: Models R532TR. TT. TV &TW 166BASIC ALIGNMENT DATACopyright 1955 by Caldwell -Clements, Inc.

6198

3693

175

62

64 ( 84 pages this issue, including Circuit Digests) TECHNICIAN March, 1955

capacitorreplacements

CAPIIHART CHASSIS CX48SymbolNo.

C219C7030704

Ratingttf @ WVDC

11@t250

50 4-40+30-1-20@40050@400%20@200/100@150/25@2S

Capehart SpraguePart No. Replacement

650228A-13 TVA -15037500901-42 1-16617500901-41 1-1658

GENERAL ELECTRIC "N" LINE

Symbol RatingNo. 115 @ WVDC

C174 100@6C308 S@SO

C400 20@450/1S0@250

C403 210+15@250

SymbolNo.

G.E.

Part No.

RCE-131RCE-174

RCE-208

RCE-209

SpragueReplacement

TVA -1101TVA -1303TVL-1S40

I TVA -1709R-1667

MOTOROLA CHASSIS TS -52SRating Motorola Sprague

ttF @ WVDC Part No. Replacement

CSO 30@t1S0/10+10@S0

C74 200+140+60@1SOC7S 200+5@1S0C77 140@lSOC99 10@450C113 60@280/200+140@I SOC114 10(1)500

TVA -2315I TVA -1412

231133495 R-1670231710941 TVL-2444231414097 TVA -142223A702450 TVA -1705231731523 1-1670231731537 TVA -1802

231733494

RAYTHEON CHASSIS 2 1T24AS, 21T2SAS, 2 1727AS'("Aristocrat" Swifts)

SymbolNo.

Rating RaytheonttF @ WVDC Part No.

SpragueReplacement

C219 2S@450/100+10@300/60@50 8C-23689

C504 ISO@ 1 50 8C-22463CSOS 150@1S0 SC -22464

C616 5@300/25@25 8C-24193

SymbolNo.

C2108

TVL-3574I TVA -1711

TVL-1430TVL-1430TVL-3637

WESTINGHOUSE CHASSIS V-2315, V-2325Rating Westinghouse Sprague

ttf @ WVDC Part No. Replacement

C4091 I

C4111 I

04211 JC21 2A

30@500,110@450/150+30@SO

V-11535-1 1.1488

C401Acs01,A

40+40@450!30+30@350 V-9191-1 TVL-4720

Z400 Integrator Plate V-9213.1 V-1

Sprague makes more capacitors . . . inmore types ... in more ratings . .. thanany other capacitor manufacturer.Send 100 for the 65 -page giantseventh edition TV Replacement Man-ual to Sprague Products Co., 65 Mar-shall St., North Adams, Mass., or getit FREE from your Sprague distributor.

DON'T VE VAOUE...INSIST

FOR SETS OF THE MONTH

Rave

2 teeth pulledfor thy

PRICED,' OM

Tett4,4ethe Service Bargain..

You'll never see your doctor advertise a special sale on appendectomies ...

You'll never see your lawyer announce cut -rates for divorce cases...

You'll never see your dentist hold a "2 -for -I" sale on extractions ...

AND You'll never see the day when you can take your TV set in for a service"bargain" and he sure you're getting a square deal!

"Bargains" in home electronic serviceare as scarce as the proverbial hen's teeth'Here's why-

The expert service technician. just likeother professional people. must undergoyears of study and apprenticeship to learnthe fundamentals of his skill. And a mini-mum investment of from $3000 to $6000per shop technician is required for thenecessary equipment to test today's highlycomplex sets. Finally, through manufac-turer's training courses and his own tech-nical journals, he must keep up withchanges that are developing as fast as theyever did in medicine, law, or dentistry.Those best equipped to apply modernscientific methods are almost_certain to be

most economical for you and definitelymore satisfactory in the long run.

Unfortunately, as in any business, therewill always be a few fly-by-night opera-tors. But patients, clients, and TV setowners who recognize that you get onlywhat you pay for, will never get gypped."There just ARE no service bargains ...butthere is GOOD SERVICE awaiting you atFAIR PRIM!

PIESIDENT

SPRAGUE PRODUCTS COMPANYNorth Adams, Mom

THIS FAMOUS SPRAGUE REPRINTAGAIN AVAILABLE!

Blank space on the bottom for your imprint.

1,000 only $3 postpaid 10,000 or more only $25

per 10,000 postpaid.

For immediate delivery on any quantity,send us your check or money order today!

(Distributors' Div. of thy Spraguo Electric Co.)

GET READY FOR .

NATIONAL TELEVISIONSERVICEMEN'S WEEK

MARCH 1-12

Television dealers and service technicians all over the country arepreparing to tie-in with a great promotional event. It's NationalTelevision Servicemen's Week, March 7-12, sponsored by the RCATube Division and registered officially with the Chamber of Commerceof the United States.

You can use this unique merchandising plan right in your ownneighborhood to meet and sell more television service prospects thanever before. Your RCA Tube Distributor offers you excellent promotionalmaterials to help you identify yourself and your store with this nation-wide consumer promotion.

Plan an active participation in National Television Servicemen'sWeek now. Act today! See your RCA Tube Distributor for full details.

RADIO CORPORATION of AMERICAELECTRON TUBES HARRISON, N.J.

Use These PromotionalMaterials

PROMOTION KIT (3F223)

we use AU tubes

Documents

Circuit Digests - americanradiohistory.comH. A. REED, V.P. & General Sales Manager LEE GRAVES, Eastern Sales Manager CHARLES S. ROEVER, District Manager ... For a detailed description