O()crU)w-JU)oaww

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wILLIO

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7176 GALE RD

ATLAS "I

Outstanding Values trom the Nation's Largest CCTV Supplier

GE VIDEO TAPE RECORDERS',built by Sony for General Electric)

.............-50%

REGULAR GE PRICEONLY

$39750 /...........

COMPATIBLE WITH ALL SONY 1/2" VIDEO TAPE

RECORDERS INCLUDING BATTERY OPERATED PORTABLES

GBC spent half a million dollars tobring you this once -in -a -lifetime close-

out price on quality video tape re-corders. GE sold thousands of theseunits at $795. Now, you can buy themfor under $400. You actually get avideo and audio tape recorder forthe price you'd expect to pay for agood audio tape recorder!

You can use your video tape re-corder for educational TV, training,instruction, presentations, advert s-ing, or instant home movies. Simpleto operate, it tapes programs pickedup by TV cameras Or off -the -air, andplays them back through a standardTV monitor. Brand new, FULLYGUARANTEED, in original factorycartons. Order today, while they last.

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The quality: brand-new Hitachi,fully guaranteed in factory -sealedcartons.The price: (distributor cost)Hitachi 7735-A vidicon $34.50Toshiba 7038-H vidicon $29.50Hitachi separate mesh vidicon 8507 $74.50Hitachi 7262-replacement for

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All vidicons sold in lots of 5 (10%more for lesser quantities)

WRITE FOR THE FREE GBC ENCYCLOPEDIA OF CCTV

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GBC Closed Circuit TV Corp.74 Fifth Averue, New York, N.Y. 10011 / Phone: (212) 989-4433

...for more details circle 111 on postcard

ELECTRONICTECHNICIAN / DEALER

7x/E#AC=IIII 311CCOMPLETE MANUFACTURER S' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 6 NEW SETS

SCHEMATIC NO.

ADMIRAL 1241TV Chassis TK2-1A

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SYLVANIA 1243Color TV Chassis D13-2

ZENITH 1246TV Chassis 13Y16,Z

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SYMBOL DESCRIPTION ADMIRAL PART NO.R208 ---1M, vol control w/switch 75C126-5R311 ---25K, contrast control part of R208R313 ---100K, bright control .. . part of R208R411- -3M, height, triple control 75C129-3R417 ---1.2M, vert hold, triple control 75C129.3R421 -500K, vert lin, triple control 75C129-3R414 -100K, 1w 60814.104R501---5.5 i1 fusible res 61C48-1R502---330 11 5w 61C20-66R503---80 11 5w 61C20-101C207-18pf, 5%, 500v. N220. cer disc 65010-140C301---10pf, 10%, 500v, NPO, cer disc 65010. 87C307,308-6.80, 10%, 500v, NPO, cer disc 65010-102C401---150, 10%, 5kv, N1500, cer disc . .65010-403C428-130pf, 10%, 4kv, N1500, cer disc 65010.400C503A---25001, 165v, elect 67C30-11C503E1-1500, 150v, elect 67C30-11C503C---20011, 150v, elect 67C30 11L201A,8---sound IF & phase shift coil 72C301.4L202 ---ratio del 72C132.821301---47.25M trap 72C308.8L304---RF choke 73C31-31305,306-video peak 73055-30L307 ---video peak on 22K res 73055-26.1401---honz lock coil 94017-19T201 ---audio output xformer 79C124-3T301 ---1st IF xformer 72C308.2T302 ---2nd IF xformer 72C310.1T303 ---sound take off coil 72C185.7T401---vert output xformer 79C139-1T402---def yoke 700C1089.5T403---horiz output 790138-3

UHF tuner 940361-2VHF tunei 940363-2

1/314BL11SOM1D1F 111

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ELECTRONIC TECHNICIAN/DEALER is pub-lished monthly by Harbrace Publications,Inc., Harbrace Building, Duluth, Minnesota55802, a subsidiary of Harcourt, Brace &World, Inc. Subscription rates: One year $5,two years $8, three years $10, in the UnitedStates and Canada. Other countries: Oneyear $9, two years $14, three years $18.Single copies 600. Second class postage paidat Danwille, New York and at additionalmailing offices. Copyright 1969 by HarbracePublications, Inc.POSTMASTER: Send Form 3579 to ELEC-TRONIC TECHNICIAN/DEALER, HarbraceBuilding, Duluth, Minnesota 55802.

1241ADMIRALTV ChassisTK2-1 A

AUGUST 1969

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1241 COPYRIGHT 1969 BY ELECTRONIC TECHNICIAN/DEALER HARBRACE BUILDING. DULUTH. MINNESOTA 55802

1242PHILCO-FORD

Color TV Chassis19KT4OB

AUGUST 1969

ELECTRONIC 17 ry-W=EgTECHNICIAN / DEALER

COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 6 NEW SETS

19KT40B CHASSISTRANSISTOR VOLTAGES

E B C

Cl 1 1.2V 1.9V 19V02 1.9V 2.55V 20VQ3 2V 2.6V 17VQ4 19V 20V 1.2V05 20V 16.5V 24VQ6 4.6V 5.2V 11V041 OV -4.7V 37VQ91 11.5V 12.5V 16V092 7.2V 7.9V 10.8V093 4V 4.7V I7.5V094 OV .55V 2.7V095 2.8V OV 36VQ96 .3V .95V 19VQ97 .45V -1.0V 22VQ98 2.1V 2.6V 22VQ99 .9V 1.5y 190Q100 1.5V 1.55V 12V0101 1.5V 1.55V 12V0102 .6V .55V 22.5V0103 .6V -.8V 8.2V0200 23V 15V 26V0201 .65V 1.2V 98V

SYMBOL DESCRIPTION PHILCO-FORD PART NO.

C204-200.20-500/200wv, 1500/350wv 30-2616-11C207-500.500-1000/50wv 30.2616-10C211---2501.4/15wv, bright control 30-2611-12CB200---power ac 42-1236-6D41 ---S07, horiz phase det 34-8057-13098-S019. 3.58MHz osc 34-8054-190300A-D---selen, cony rect 34-8058-2IC91---3.58MHz osc 46.5002-4J202---def yoke 41-4385-3L2 ---2nd video IF 32-4935.1L4---40MHz choke 32-4837.1L6---4.5MHz trap 32-4869-2L9 ---video det 32-4762.13L10---RF AGC 32.4762-3L13---41.25MHz trap 32-4762.23L16 ---1st video IF pole 32.4652-79L41---horiz hold 32-4891-2L91 ---sound interstage 32-4936.2L92 ---sound take -off 32-4936.1L93 ---sound del 32.4928-1L94 ---tint control 32-4942-1L96---chroma take -off 32.4878-3L100---3.58MHz osc 32.4932-1L101-6800, "X" demod coil 32-4762-14L103---demod driver 32-4930-1L105-1000, delay driver out 32-4762-4L107-2700 video out 32-4762-9L108-1800, video out plate 32-4762.70L91 ---delay line 32-4839.3R223 ---170-30M, focus bleed 33.1383-1RT200---degaussing 33-1376-6RV55---horiz bias 33-1379-2RV200---degaussing 33.1379-8VR1---3K, RF AGC emit 33-5628-7VR2---750 11 sound reject 33-5628-3VR41A-C---1.5M, CRT screens 33.5595-20VR91---blu, grn, red CRT drive 33-5632.1VR92---4.7K, color killer 33-5628-6VR93---250K, CRT bias 33-5628-12VR201---10M, focus 33-5631-10VR202---25K, volume 33-5634-4VR203---1.2K, tint 33-5623-20VR204---100 (1 contrast 33-5631-12VR205---500 0 bright 33-5631.9VR206---A-vert, hold, B -color 33-5636-6AOT---audio output 32.10097-1FC---filter choke 32.10095-1HOT---horiz output 32-10111-1PT ---power 32-10110-1VOT---vert output 32-10117-1

chroma assy., w/comp 38-10177-7

PIN NO.V41 V42 V91 V92 V200 V201

6JZ8 6BL8 6ML8 12GN7 6JS6

1 OV 84V 185V 26V FIL FIL2 88V -36V 153V 24V OV -3 OV 1 4 5V 183V OV 110V -4 278V FIL FIL FIL OV 295V5 0 FIL FIL FIL -59V -6 58V 172V 0 FIL -7 58V .17V 2.5V 248V DO NOT

MEASURE8 2 8 2V 4.3V .35V 145V9 93V .15V .3V OV -59V -

10 -19V - OV 295V11 OV - - 110V -12 OV - - FIL FIL

19KT4OB CHASSISTUBE VOLTAGES

Resistance measurements of transistors in circuit (power off).

All measurements are in ohms and taken with a B & K Model 175 VTVM with an allowable tolerance of --20%.

TRANSISTOR MEASUREMENTS (USE X100 SCALE)

Coll. to Gnd.+

Emit. to Gnd.+

Base to Gnd.+

Coll. to Emit.(-) (+)+

Coll. to Base(-) I+)+

Base to Emit.(+) (-)

+

(820) (1K) (1K)Q1, 920 220 1350 1.2K 1.6K 1.6K

(840) (1.2K) (1K)Q2, 740 440 5K 1.4K 6K 5.2K

(700) (950) (950)03, 560 125 1.7K 700 2.2K 2K

(900) (900) (2.2K)Q4, 1050 460 1150 3K 1.2K 1.2K

(2.4K) (INF) (840)Q5, INF 1.2K 1.2K INF 780 1,9K

(1.3K) (5K) (800)06, 1.3K 270 3.8K 700 800 4.2K

(25K) (INF) (850)Q41, 30K 0 INF 25K 760 INF

(3.5K) (850) (900)Q91, 1 400 2K 560 2K 1600 2.6K

(1500) (900) (940)Q92, 700 800 1150 1500 1700 2K

(1350) 1800) (800)Q93, 1.1K 300 2K 1450 3K 2.3K

(50K) (850) (820)Q94, 2.2K 100 50K 2.3K 50K 45K

(15K) (800) (800)Q95, 18K 12K 9K 7K 20K 20K

(850) (1100) (1070)Q96, 1200 80 3.8K 1280 5K 4K

(4K) (760) (850)Q97, 1.4K 2.4K INF 5K INF INF

(7.5K) (850) (880)Q98, 750 6.5K 40K 1.7K 50K 50K

(580) (750) (820)Q99, 500 70 960 580 1400 1K

(2.1K) (610) (2K)Q100, 3.8K 500 1420 4.2K 5K 680

(4.5K) (630) (700)Q101, 4K 540 1 400 2.2K 5.5K 2K

(1500) (920) (960)Q102, 1400 180 9K 1600 12K 10K

(1850) (700) (740)0103, 2200 70 7K 2200 9.5K 7K

(260) (500) (550)0200, 1K 280 1250 650 680 1.4K

(2.8K) (600) (700)Q201, 900 10 10K 10K 20K 10K

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R362---10 vert centR369---38 thermR370 3,4M yen linR374 ---100K height contR422 ---1K horiz holdR442---10 horiz centerR456 ---500K H.V. adiR514---VOR 67ma 20vdcR516 ---therm 120 II coldR606---250 CRT biasR616---500 color killerR629---500 color killerR694 ---1.5M grn scr contR1122 ---4K etc bal

.11C

**. T.

4.1 L100 ---coil tweet HASC4471111,s1.40 PVT ts L102 ---sound input

L200 ---link coilr rof

400 L218---4.5MHz trapL400---horiz fret'

.04 SY

I-1,...F

L404---foc coil ITV)L406 ---chokeL408---horiz eff

1040 L610 ---react coilnioC) um T102 ---ratio det

T104 ---audio output

.1T200 ---IF output

,...... c.,K ..11 7300---vert outputT302 ---pincushion corr.T304---horiz output

114T500 ---power transfT600 ---chrome outputIItT602---bandpassK100T604 ---burstT606-3.58MHz outputT800---RT blu horizT1100 ---AFCCB500- cir brkrCPR200- capristor 47PF/2 2M0L200 ---delay line

IP"

4-4111"1-110

T1100 CST IS.. 0 --

COPYRIGHT 1969 BY ELECTRONIC TECHNICIAN/DEALER BUILDING. DULUTH. MINNESOTA 55802

45 VPPHoriz.

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11 VPPHoriz.

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SYMBOL DESCRIPTION SYLVANIA PART NO.C336---2 sec elect 41.27344-1C336A---2 sec 10/350v 41.27344.1C33613-2 sec 50/150v 41.27344-1C518---4 sec elect 41-27418.1C518A- 4 sec 100/400v 41.27418-1C51813-4sec 100/400v 41.27418-1C518C---4 sec 200/450v 41-27418-1C5180---4 sec 3/400v 41-27418-1C522---3 sec elect 41.27421-1C522A---3 sec 1000/40v 41-27421.1C5228- 3 sec 100/40v 41.27421-1C522C---3 sec 50/450v 41-27421.1R108 20K vol 37.23479-32R110 ---25K tone 37-27242-8R126---VDR1MA 76v 38.15257-18R254 ---10K contrast 37-27242-13R260 ---250K bright 37-15536-10R280 ---6K blu dr 37-11832-15R335 ---750K vert hold 37-2724241R352 ---1.5K AGC 37-11632-1

37.18021-17

37.11632-1937-11832.1937-27242-12

37-17539-337.16020-27

38-17072-138-17071-1

37-18020-3037-11832.19

37.11832-2037-14587.7

50.16103-4667 23832 250-23828-150.16238-550-23508.150-27845-150-92043.150-23507.150.16185-357.23547-156-16018-857-23831-156.17559-650.23485-150.27415-155-27691.150-27407-150-27405-150-27408-150-27549-150-16248.957-23581.129.23918-132-11448.432.18108-2

1244AIRLINE

TV ModelGEN-13160A

AUGUST 1969

AMONOPOLE ANT

L710BALUN

E XT

TOHANDLEBRACKET

VHF ANT

M701

VOLTAGE SYMBOLLEGEND.

9Kv GigNIGN420V Millow)260v

1309 A

10.5v

DC VOLTAGEMEASUREMENTS AREAT NO SIGNALCONDITION.

DC -188

ELECTRONIC fir-W=17A 31(TECHNICIAN /COMPLETE MANUFACTURERS' CIRCUITAND TECHNICAL INFORMATION FOR 6

SYMBOL DESCRIPTION AIRLINE PART NO

C708-1500 @200v elect TV3284C711A,B,C,0-1200/ 804/ 20(4/1 Oil @ 350v

elect TV3285R622 ---100K, 2w, 10w,oxide film CD1410

DIAGRAMS R705,R706---3K, 4w, 10%, oxide film TV23275N Ew SETS R709A,B-10 015w/150 , 5w, special TV23177

R711---1.811, 17w, special TV23178R313, SW -701---1M, pot, on -off vol w/switch TV24320

19V-16OUL)R520A---1M, pot, vert size TV25165R5206 -1M, pot vert lin TV25165R520C---50K pot horiz hold TV25165

U T 6 -2U2 IuNF.TuNERI

L2i

/A Aso. '!-,' ,,t

t 017'

T6 -I

1-.°1.3is -ISO on masa 6 30-1

[04 ' 00 ----&------' 0' r,,,,,c., L 7 119----- c,

- As4K

L4 1,47* 0Am w

-'" MW -TUNER) 01.290 684,2SC 387NIB - 7U2G PAPS 6543 or TISI 8 Log osc

rmoso

1m, ANT NTB-TIEO

4,..."44

1 en11-...7,..eo,so. Aar -1'TrAF...1;11.0767..c.v. 24:reit_

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KEYED G C- I OV

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v 302

PHC4T

R714A---250K pot vert hold TV25166R714B---100K pot AGC TV25186

TV25168R715 --20K pot contrast I8V-0071 TV2572L201 ---coil 47.25MHz trap 12TIF-4871 TV62248L202 ---coil filter 1211.9701 TV614741204---coi peak IC1-1511 TV618011301---coi sound det ITIF-544I TV62254L601---coi horiz hold ITL-971 TV61373L603---coi horiz lin ITL-961 TV81337L702---coi peak ICL-581) TV616221703---coi peak (HL -821K) TV61639T201-50.25MHz trap ITIF-3021 TV62288T202---xformer, 2nd pic IF ITIF-343I TV62300

R714C---1M pot vert hold assy I8V-0611

111DI

309 200v

6

R302 7TP301IOOK

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tuner, VHF INTB-7U2G) TV35185tuner, UHF IUT6.2U2I TV35148yoke, def assy TV61817

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F Oi

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(PART OF R3I31C707

v 0 L 704 v 02 L 705 V Om

00701242 1.00701252 00701:2 7C070I272mr C0701282.! c0701292; 007022°C I110

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INTERLOCK

C- LINE

1244 COPYRIGHT 1969 BY ELECTRONIC TECHN ICI AN/DEALER HAR BRACE BU I LDI NG. DULUTH M I NNESOTA 55802

1245SYMBOL DESCRIPTION OLYMPIC PART NO. T102---vert outputVR101-500K, vol, power on -off . . PTJ33392 T103 ---voltage highVR102-500K, picture PTJ33393 T201---IFT inputVR103-100K, bright PTJ60483 T202---IFT, 1stVR104---1M, vent hold PTJ60486 T203---IFT, 2ndVR201A---500K, vert height PTJ61586 T204---IFT, 3rdVR201B---500K, vert lin PTJ61586 T205 ---sound IFTVR105---1M, horiz hold PTJ60486 T206 ---ratio detC103---25014, +200.1, +50.1, 200v C0J33413 L101 ---coil, chokeC220-10011, 6.3v C0J60319 L102 ---choke, filterC231-1500 4-5% L103 ---yoke, defT101 ---speak output TRJ33387 L201 ---coil, choke, 8.80

NOTE:

I ALL CARBON fiLm RESISTOR' RD) /AWES /NONMST.10%TOLERANCE '/2 wArr UNLESS OTHERWISE NOTED.

2. ALL CARSON COMPOSITION RESISTOR !RC) VALUES /A/OHMS !20/TOLERANCE 1/2 WATT UNLESS OTHERWISE NOTED.

3. ALL MICA AND PAPER CONDENSERS:20% TOLERANCE UNLESS

OTHERWISE NOTED.

4 ALL CERAMIC CoNDENSERSOsmARK DISC TYPE) VALUES IN MICRO- MICRO

FARADS !igo A TOLERANCE UNLESS OTHERWISE NOTED.

5 ALL VOLTAGES MEASURED BETWEEN POINTS INDICATED AND CHASSIS.

USING AN ELEC mow VOLTMETER. ALL VOLTAGE READINGS /5%WITH INCOMING SIGNAL AND WITH PICTURE CONTROL SET TOPRODUCE 60 VOLTS PEAK TO PEAK AT KINESCOPE.

6 * * MARK TEMP. COEFFICIENT.

FOCUS ADJUSTMENT

CONNECT ORANGE LEAD

FROM TERMINAL D. TO

A. 8 OR C. WHICHEVERGIvES HST FOCUS.

TO VHF TUNERANT

SHAFT

ACAMP, /Jar

ON -OFF S WITCH/NTERLOCK 5/0/

clt 401" *82 46C

Alz 5Milt* '4v ANT

/Hour

RF

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t ROILISO 1

TRJ60103TRJ60105TRJ60314TRJ60320TRJ 60315TRJ 60315TRJ33022TRJ33241CLJ60479CLJ33385CLJ61374CLJ60471

L203 ---coil, inductor, 5.6111L204 ---coil, inductor, 47141L205 ---coil, inductor, 180141L206 ---coil, inductor 27001L208 ---coil, horiz heti ..L209 ---coil, choke, 101.111210 ---coil, chokeS101---rec silicon .....F101 ---fuse, 1.9a0203 ---diode, 1N60

tuner VHFtuner UHF

V7A 1/2 6GH8A

CLJ60472CLJ60473 TECHNICIAN /CLJ60474CLJ60475CLJ33390CLJ60477CLJ60484RFJ31363FUJ61389INJ60034CLJ61375CLJ61376

ELECTRONIC _117GTLFCOMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 6 NEW SETS

rr -7206

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1K 077.5

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AUGUST 1969EARPHONEJACK

T/0/SP OUTPUT

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1246

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10 T8SEC

NOTES

LL VOLTAGES MEASURED FROm CHASSIS TO POINTS INDICATED.ILL VOLTAGES ARE D C UNLESS OTHERWISE SPECIFIED.ALL D C VOLTAGES TO BE MEASURED ITM A VACUUM TUBEVOLTMETER HAVING II BEGOHA INPUT RESISTANCE.All VOLTAGE MEASUREMENTS TO BE MADE WITH NO SIGNALPRESENT SETTING OF CONTROLS AND CHANNEL SELEC.TOR SET TO CHANNEL 7 UNLESS OTHERWISE SPECIFIED.

ALL CAPACITOR VALUES IN 111CROFARADS UNLESS OTHERWISE

FOR CAPACITOR CAPACITY TOLERANCE SEE LEGEND

ALL RESISTORS AREt 101 TOLERANCE, CARSON, I'7 WATTUNLESS OTHERWISE SPECIFIED

RESISTANCE mEASUREmENTS SHOWN WITH COIL DISCONNECTEDPEON CIRCUIT

COIL RESISTANCES MOT G,VE, ARE UNDER ONE OHM.)71,41:AGATES NSULATED BRACKET

6 INDICATES 20% MAY BE USEDARROWS ON POTENTIOMETEPS INDICATE CLOCKWISE ROTATION.

CHASSIS INDICATES VOLTAGE SOURC

PICTURE TUBE 7ND ANODE VOLTAGE TO BE MEASURED WITNELECTROSTATIC KILOVOLTmETER WITH BRIGHTNESS ANDCONTRAST CONTROLS FULL COUNTERCLOCKWISE

CO -CAPACITOR VALUE SELECTED FOR MINIUM YOKE RINGING.VARIES WITH A RANGE OF 47 PF TO 72 PF 17 K ,010%)WHEN NECESSARY. REPLACE WITH EXACT VALUE FOUND INYOKE

CIRCLED LETTERS INDICATE ALIGNMENT 0-10,AND TEST POINTS WHERE APPLICABLE.C . DETECTOR OUTPUT G - 3RD IT GRIDD VIDEO OUTPUT N . SOUND LIMITER PLATEE I F AGC SOUND OUTPUTF - GROUNDED FOR I F ALIGNMENT P . SOUND DISC GRID

e.

L

1246 COPYRIGHT 1969 BY ELECTRONIC TECHNICIAN/DEALER HARBRACE BUILDING. DULUTH. MINNESOTA 55802

OVERHAUL

OVERHAUL $9.75 REPLACEMENT TUNERS ...Nine -seventy -live buys you a complete tuner overhaul-in-cluding parts (except tubes or transistors)-and absolutelyno hidden charges. All makes, color or black and white.UV combos only $15.

Guaranteed means a full 12 -month warranty against defec-tive workmanship and parts failure due to normal usage.That's 9 months to a year better than others. And it'sbacked up by the only tuner repair service authorized andsupervised by the world's largest tuner manufacturer-Sarkes Tarzian, Inc.

Four conveniently located service centers assure speedyin -and -out service. All tuners thoroughly cleaned, insideand out ... needed repairs made ... all channels aligned tofactory specs, then rushed back to you. They look-andperform-like new.

Prefer a universal replacement? Sarkes Tarzian willgive you a universal ieplacement for only $10.45. Thisprice is the same lot all models. The tuner is a newtuner designed and built specifically by Sarkes Tarzianfor this purpose. It has memory fine tuning-UHFplug-in for 82 channel sets-universal mounting-hi-gain-lo-noise.

ORDER TUNERS BY PART NUMBER,AS FOLLOWS:

IntermediatePart = Frequency

AF Amp Osc. MixerTube Tube Heaer

MFT-1

MFT-2

MFT-3

41.25 mc Sound45.75 mc Video41.25 mc Sound45.75 mc Video41.25 mc Sound45.75 mc Video

uGK5

3GK5

2GK5

6L.1.8

5L.I8

5CG8

Parallel 6.3V

Series 450 MA

Series 500 MA

Prefer a customized ieplacement tuner? The price willbe $18.25. Send us the original tuner for comparisonPurposes, also TV make, chassis and model numbers.

SEND ORDERS FOR UNIVERSAL AND CUSTOMIZED REPLACEMENT TUNERS TO OUR OFFICE IN INDIANAPOLIS.

TUNER SERVICE CORPORATION FACTCRY-SUPERVISED TUNER SERVICEMIDWEST 817 N. PENNSYLVANIA ST., Indianapolis, Indiana TEL: 317-632-3493

(Home Office)EAST 547-49 TONNELE AVE., Jersey City, New Jersey TEL: 201-792-3730SOUTH-EAST 938 GORDON ST., S. W., Atlanta, Georgia TEL: 404-758-2232WEST SARKES TARZIAN, Inc. TUNER SERVICE DIVISION

10654 MAGNOLIA BLVD., North Hollywood, California TEL: 213-769-2720

WATCH FOR NEW CENTERS UNDER DEVELOPMENT

AUGUST 1969

...for more details circle 12 8 on postcard

19

Unless you are an advanced CBer,you probably can't use Johnson's

new solid state Messenger 124

New Messenger 124 full -function, 23 -channel base station.18995

(less mike)

If you're an operator with a purpose . . . consider this, the mostsophisticated of all Johnson 27 MHz base stations . . . from thelargest and most experienced of all manufacturers of citizens andindustrial two-way radio.

To the advanced CB operator, the Messenger 124 means completemastery of the equipment-a degree of control and measurementthat permits, for the first time, full utilization of all the enormouspower, hairline selectivity, sensitivity and noise suppression of whichthe incomparable Johnson circuitry is capable.

Whatever your requirement, the Messenger 124 offers a new expe-rience in base station performance.

Features

± 3 kHz Delta fine tuning Adjustable microphone gain with mod-ulation adjustment to 100% 21/2" four-way professional meter,measures SWR, output, % modulation and receive 4.3 MHz crystalfilter for unequalled selectivity Built-in speech compressionPanel -controlled, series -type threshold noise limiter Built-in tonecontrol Built-in 117 VAC/12 VDC power supply 14 tuned circuits FET for superior gain Dual conversion receiver

E. F. JOHNSON COMPANYWaseca, Minnesota 56093

...for more details circle 114 on postcard

20 ELECTRONIC TECHNICIAN/DEALER

HUGH "SCOTTY" WALLACEPublisher

PAUL DORWEILEREditor

JOSEPH ZAUHARTechnical Editor

MORTON WARNOWField Editor

DONNA BUTLERProduction Editor

BOB ANDRESENGraphic Design

LILLIE PEARSONCirculation Fulfillment

JOHN KESSLERManager, Reader Services

BERNICE GEISERTAdvertising Production

OFFICES

71 Vanderbilt Ave.New York, N.Y. 10017

Phone: (212) 686-2200Telex: 01-26286

43 East Ohio St.Chicago, III. 60611

Phone: (312) 467-0670Telex: 02-53549

1901 West 8th StreetLos Angeles, Calif. 90057

Phone: (213) 483-8530Harbrace Building

Duluth, Minn. 55802Phone: (218) 727-8511

Telex: 02-94417

MARKETING REPRESENTATIVES

HUGH "SCOTTY" WALLACEChicago: (312) 467-0670

DEAN GREENERChicago: (312) 467-0670

ALFRED A. MENEGUSNew York: (212) 686-2200

DONALD D. HOUSTONLos Angeles: (213) 483-8530

ROBERT UPTONTokyo, Japan

I.P.O., Box 5056

HARBRACE PUBLICATIONS, INC.

JAMES MILHOLLAND, JR.Chairman of the Board

JOHN B. GELLATLYPresident

RICHARD MOELLERTreasurer

LARS FLADMARKSenior Vice President

HARRY RAMALEYVice President

BEN MARSHVice President

JAMES GHERNAArt Director

WILLIAM SWAINDirector of Marketing Services

DOUG HEDINAd Production Manager

ELECTRONICTECHNICIAN / DEALERWORLDS LARGEST ELECTRONIC TRADE CIRCULATION

AUGUST 1969 VOL. 90 NO. 2

35 TEKLAB REPORT ON SEARS SILVERTONEOur analysis this month discusses the new Silvertone 18 in. Color TV, Model9168. The report will be given in a two part series as it explains individual cir-cuits with appropriate diagrams and schematics.

40 POSTMARKER SWEEP ALIGNMENTPart two of this timely service article outlines actual alignment procedures us-ing various types of sweep/marker generators complete with waveforms andtest equipment set up diagrams

46 SELLING CCTVSery ce-dealers and technicians breaking into the CCTV market will find thisseries of special interest as it outlines not only applications, but also providesuseful information on procedures that educational institutions follow to pur-chase equipMent of this type

51 TESTLAB REPORT ON B&K 415The versatility and nature of an instrument such as the B&K 415 Sweep/Markergenerator makes it necessary to spend the entire testlab report on it this monthwhich describes the unit's features, operation, advantages and disadvantages

22 EDITOR'S MEMO 58 COLORFAX26 LETTERS TO THE EDITOR 62 NEW PRODUCTS29 BOOK REVIEWS 66 NEWS OF THE INDUSTRY32 TECHNICAL DIGEST 69 CATALOGS AND BULLETINS54 DEALER SHOWCASE 74 AD INDEX

COVERTwo-way radio goes everywhere, even in the Northwoods, as depicted by thecharming young lady on this month's cover.

TEKFAX 16 PAGES OF THE LATEST SCHEMATICS GROUP 204

ADMIRAL: TV Chassis TK2-1AAIRLINE: TV Model GEN-13160AOLYMPIC: TV Chassis 9P90/9P91PHILCO-FORD: Color TV Chassis 19KT4OBSYLVANIA: Color TV Chassis D13-2ZENITH: TV Chass s 13Y16,Z

HARBRACE PUBLICATIONS, INC.A subsidiary of Harcourt, Brace & World, Inc.

ELECTRON IC TECHNICIAN/DEALER is pJblished monthly by Harbrace Pub-lications, Inc., Harbrace Building, Duluth, Minnesota 55802, a subsidiary ofHarcourt, Brace & World, Inc. Subscription rates: One year $5, two years $8,three years $10, in the United States and Canada. Other countries: One year$9, two years $14, three years $18. Single copies 75ct in the United States andCanada; all other countries: $2.00. Second class postage paid at Dansville, NewYork, and at additional mailing offices. Copyright 1969 by Harbrace Publica-tions, Inc.

POSTMASTER: Send Form 3579 to ELECTRONIC TECHNICIAN/DEALER,Harbrace Building, Duluth, Minnesota 55802.

AUGUST 1969 21

3 GUN SALUTE

Only the Sencore CRT Champion has three gun controlJust like the color TV set.

Only Sencore has automatic color tracking to make yourjob easier.Only Sencore has the simplified instructions in thecover so that you can analyze any color CRT tube inseconds. Just flip the "Color Gun" switch from red togreen to blue (after setting the three G2 controls) andthe CR143 Champion will tell you if the tube hasadequate emission and if it will track in the TV set.Why don't you salute the Sencore Champion today bymarching in and asking your distributor to try one.You won't bring it back because it is 100 percent.

1\1 CD FRNO. 1 MANUFACTURER OF ELECTRONIC MAINTENANCE EQUIPMENT

426 SOUTH WESTGATE DRIVE, ADDISON, ILLINOIS 60101

...for more details circle 126 on postcard

EDITOR'S MEMO

INCREASING INTERESTHAUNTS SMALL BUSINESS

A little item close to all our heartsis the rising prime interest rate. Theresearchers of the National Feder-ation of Independent Business feelthat the latest boost to 8 1/2 percentcould effect the survival of many in-dependent business firms and mayeven result in increased unemploy-ment.

At the time of their report, thenational average was at 7.5 percent;8.1 percent was the going rate on thePacific Coast. Based on these ratesthe national average bank rate to in-dependent business may be slightlyover 9 percent and just over 10 per-cent on the Pacific Coast. But the in-crease of the prime rate, the inter-est charged to the wealthy borrow-ers, from 7.5 to 8.5 percent presentsa whole new ball game. If this rateis held, the Federation's researcherssay independent firms will be pay-ing close to 10.5 percent on the na-tional average and 12 percent in thePacific States for bank loans. Thiswill be the highest rate since the endof the Civil War when gold was bring-ing over $280 per ounce.

While many businesses will not beable to keep up inventories, in somestates they probably won't be able tooperate at all. Even more serious is theemployment outlook for the workingman. A summary in FORTUNE maga-zine shows that there are an estimated76,000,000 people employed. About45,000,000 people work for smallerfirms which depend on lending capitalto operate unless they have access topublic money through the stock market.

So what does it all mean? It couldmean that unless Congress takes acloser look at what makes our nationalmoney system tick, you could endup working for one of the corporategiants --or in the unemployment line.

77 crromuir TCMJIIIPI A II mcm CO

"When we started our business,we picked the Yellow Pages as our

only source of advertising."

"Our businessstarted out as awholesale operation.So we chose theYellow Pages as oursingle source ofadvertising," saysKen Champlin,general manager ofRadio Supply andEngineering Co., Inc.,Detroit, Michigan."The Yellow Pageswas a must. It wasthe best way we couldmake contact with peopleand let them know whowe were. Now we havetwo branch locations. Andthe Yellow Pages helpsour customers keep track of

miriicT t GAO

us. When they look throughthe listings for electronicequipment, they recognizeas immediately. Naturallywe're the ones they call.We've grown a lot since we

started out. The YellowPages has really helped us."

An effectiveIvan' to build

Pages business.

...for mere details circle 102 on postcard23

NEW AND NOTEWORTHY

AC VOLTMETER PLUG-IN 700

Down to 10iiv with 0.1 percent accuracy

An ac voltmeter plug-in, the DP130, is introduced. The newplug-in, when used with any main frame DMS3200 digital mea-suring system, provides digital display of ac voltage measure-ments over a wide range of level and frequency. AC measure-ments down to 10pv and as high as 1kv are possible with theunit and with a claimed accuracy specification of ± 0.1 percentof reading ±1 digit. The plug-in may be used for measurementsover a wide frequency range of 22Hz to 1.0MHz. Accuracyof 0.1 percent is maintained over the range of 22Hz to 100kHzand with but a slight reduction up to 1MHz. The unit is design-ed to provide RMS readings when measuring sine wave acsignals; however, it will accept and display indications of theRMS value of square and triangular waveform inputs as wellif specified correction factors are applied to such measure-ments. Loading errors are minimized by the high input imped-

100M shunted by approximately 25pf on all ranges.Stability is assured by ultra -stable voltage dividers and a pre-cision temperature compensated zener diode reference. Itsbasic design uses a dual slope, self -zeroing integration tech-nique. Input circuitry is protected from damage by excessivelyhigh voltage and a built-in filter, selected by a front panelswitch, providing additional noise rejection during low fre-quency measurements. Price $375. Hickok.

TAPE RECORDER -PLAYER 701Automatic recording leveland push-button keyboard

A portable cassette tape record-er -player, the first of such pro-ducts to be marketed by the com-pany is introduced. The ModelCT100W operates from house cur-rent or with four "C" cell bat-teries. A six push-button key-board places all functions at thefingertips --cassette up, rewind,stop, play, fast forward and re-cord. The unit has an automaticrecording level. It is finished withwalnut grain sides, black top andwhite keyboard. It measures2 1/8in. high, 5 1/4in. wide, 10 in.deep and weighs 5 lbs. Includedwith the recorder is a microphoneand a listening earphone whichturns off the speaker automatic-ally when inserted, also, theearphone may be used as a moni-tor while making recordings. Aleatherette carrying case isincluded. List price is $69.95.Sylvania.

FOR MORENEW PRODUCTSSEE PAGES 54 AND 62

24 r,r,noo, Fr, iM11,141,1 nr rn

This little part playsa big role in radio.

01

1 GM DS -501

This box gives you top revues. T r an si stor

The transistor is no bit playerwhen it comes to radio

performance. That's why Delcotransistors are manufactured

under controlled conditions thatassure high reliability. And

why they're thoroughly testedbefore being placed in the

familiar blue and black box.

Delco Radio engineers areleaders in auto radio design

and transistor technology.

Delco radios are originalequipment on over half

of the cars on the road.

That United Delco box is yourguarantee of genuine OEM

quality replacement parts. Andjust 12 Delco transistors replaceover 7,500 other types.

Doesn't it make good sense tostock the best?

Remember these facts when youre -order. And remember, too,that your United Delco supplierhandles the most recognizedname in the parts business.

Next time you think little,think big. Think Delco.

DELCO RADIO, Div. of General Motors, Kokomo, Ind.

GM United 10DelcoMORK OF EXCELLENCE

...for more details circle 110 on postcard

AUGUST 1969 25

HAS EVERYEXACT

REPLACEMENTTWIST PRONG AFH

ELECTROLYTICWhy fool with "jerry-rigged" electrolyticswhen there's an Aerovox exact replace-ment to give you the right rating and theright size? Aerovox actually stocks alltwist prong AFH electrolytics-this meansoff -the -shelf availability...not "we'llbuild it for you if you order it" delivery.Available in singles, doubles, triples andquads, these popular types are now man-ufactured in new values for filter bypassapplications in color TV as well as radio,black and white TV and amplifier equip-ment. Many values are now being usedfor industrial applications.Aerovox AFH Twist Prong Electrolyticsfeature ruggedized prongs and mountingterminals, high purity aluminum foil con-struction, improved moisture resistantseal and 85°C operation. Here is thequality you need to protect your profes-sional reputation.Go to your Aerovox Dis-tributor for a perfect elec-trolytic fit-he will deliverexactly what you want inless time than it takesto tell. Ask him for thenew Aerovox Service-men's Catalog =SE -567or ask us. We'll be happyto send one your way.

/".HOVOX AEROVOXCOPPORATIO N

DISTRIBUTOR SALES, New Bedford. Mass. 02741

Visit AEROVOXat WESCON SHOW, BOOTH NOS.: 4409 & 4410

...for more details circle 101 on postcard

26

LETTERS

TO THE EDITOR

Still in the Running1 am renewing my subscription and

also asking for some advice. I havesome antennas patented, and althoughI was very athletic in the Army in1933, we all get it sooner or later. Iam by no means an invalid, but I amretired and broke. I would like to mar-ket my antennas which I have spentat least 30,000 hours developing. Per-haps you or your readers can help.

GRADY L. TEAGUE22354 Ave. 152Porterville, Calif. 93257

N EA CertificationI have been a reader of ELECTRONIC

TECHNICIAN/DEALER for manyyears and all I can say is keep up the goodwork. However, I would appreciatea little information on how to geta National Electronics Assn. cer-tificate. I know it involves an examin-ation, and there was an article sometime back about obtaining an electro-nic technician engineers certificate.I want to be a number one man in theservice business and I don't want tohave to tell what I know. I want peo-ple to see for themselves.

LAWRENCE J. ROSEMill Hill Rd.Wellfleat, Mass. 02667

Reader's AidPerhaps one of your readers can

help me locate a schematic for an At-water -Kent receiver, Model 60C. Afew years ago I had excellent responsefrom your readers in a similiar situa-tion.

ROBERT G. SPACHMAN109 S. 5th St.Saudeston, Pa. 18964

I would welcome any help obtain-ing a schematic for a battery elimina-tor made by ATR. I have written thecompany repeatedly to no avail. Theunit is an ATR rectifier power supplyG20C-ELIR.

WOODROW EMERTON, JR.448 Brackett Rd.Rye, N.H. 03870

Old PhotofactsAfter noting the large number of

requests for schematics in your Let-

ters to the Editor column, I wouldlike to make available to any one in-terested, a copy of Sam's Photofactsfor any particular schematic from 1948to 1960.

MAYO ELECTRONICSERNEST G. MAYO

172 N. Walnut St.Kahoka, Mo. 63445

Used Equipment SaleI have been a satisfied subscriber

to ELECTRONIC TECHNICIAN/DEALER for a number of years andfound it most helpful. However, I am nowout of the part-time service business andwonder if any of your readers wouldbe interested in purchasing the fol-lowing equipment: Heathkit IG-62color bar generator, IT -11 capacitytester, Devry 5 in. scope and VTVMcombination, Mercury 100 tube tester,B&K CRT tester and a caddy of tubes.

MELVIN OLSON941 Gail Ave.Neenah, Wis. 54946

'Amen'ET/D's particular slant and format

makes it the only national publicationthe technician and small dealer hasavailable to satisfy his interest in whatis going on in the industry nationwide.

While your Technical Digest andColorfax features help many a tech-nician over the hump on factory goofsthat are squeezing the small dealer'sdollar margin, your editorials fromtime to time focus on problems thatconcern every one connected with theindustry.

Your editorial in the April 1969 is-sue is one I personally say "Amen"to! If the typical Wisconsin dealer,whom you quoted regarding the 50percent defective merchandise, mustrepair sets before he can sell themrepresents business as usual in ourparticular segment of the electronicsindustry, our EIA spokesmen must begetting near the head of the line fortheir turn in the congressional hotseat!

It might be fair to ask if most deal-ers are responding to this problem of"new junk" by hiring extra techniciansto make it saleable? It might be per-tinent to point out that there are stillAmerican companies whose distribu-tors assume responsibility for a prop-erly operating product when orderedand delivered to a retailer.

H. NEUMANWalport, Ore.

USE ZIP CODE

ELECTRONIC TECHNICIAN/DEALER

Pride,fear,and confusionare stopping 5 million disabled fromgetting the help they need.

Five million disabled peopleare in need of our help. And wecan't find them. Either they don'tknow where to go for help or theywon't go.

Some are disabled physically.Others mentally. Some are living in

the past. Others, disabled from birth,have no past.

But most,with proper guidanceand medical aid, could be livinginstead of existing. They could belearning to take care of themselves.They could be taught interesting

jobs. They could be getting moreout of life than they're gett ng.

So if you're disabled (or con-cerned about someone who is),write to us for help.

You've got nothing tolose but your disability.

What's stopping you!Write:Help, Box 1200, Washington, D.C. 20013

AUGUST 1969 27

If you thinkrising tuition

costs arepaying forcollege

educationyou're 2/3 wrong.

Tuition, rising though it is, covers only about '; ofwhat it takes to educate a student today.

And costs are multiplying. Colleges are girdingthemselves now for the undergraduate influx that couldmean 10 million students by 1977.

The new dorms, laboratories, libraries and facultysalaries to sustain this learning population must bepaid for. This could lead to a financial crisis, unless we-individuals and business-give education its rightfulpriority in the American scene.

If you think it's important, you'll prove yourself100':, right by sending a contribution to a college.

Give to the college of your choice.loft

0 '1. fl,ANCIALAdvertising contributed for the public good. (_) A111 TO

NNW

28ELECTRONIC TECHNICIAN/DEALER

BOOK REVIEWS

THE OSCILLOSCOPE, by GeorgeZwick, published by TAB Books, Inc.,256 pages, 170 illustrations. $7.95 hard-bound, $4.95 paperback.

This book is a revised third editionand includes information on the lat-est scopes. There are eight chapters,most of them quite thorough, especial-ly the chapters on typical oscilloscopes,alignment, scope techniques, mea-surements and experiments. The textincludes many good backup diagramsand photos for each chapter. The firstchapter describes the various wave-forms such as de waves, sinewavesand trapezoidal. The second chaptergets into the scope CRT itself, main-ly discussing deflection systems. Fromthe third chapter on, the text coversscope types, their uses and actual ap-plication. This includes informationon the latest triggered sweeps, dual -trace and also discusses electronicswitches for multi -waveform display.Since the scope is one of the techni-cian's most important service tools,especially in today's color sets, heshould know all he can about its use.For the large amount of informationthis book provides, it is a bargain re-ference source for any service tech-nician's library.

CONTROL SYSTEMS FOR TECH-NICIANS, by (7. 7'. Bryan, publishedby Hart Publishing Co., 238 pages,6 x 981. $12.50 hardbound.

The 12 chapters of this book explainthe many types of control systemsused in industrial electronic applica-tions and is written to help techniciansunderstand their operations. It is nota servicing guide. The book discuss-es control system components suchas photo electric cells, tachometers,strain gauges, thermo couples andelectromagnetic flowmeters. Otherchapters deal with closed loop sys-tems, amplifiers, valves, motors, re-mote transmission, position controlsystems, speed control and processcontrol. The book is well written andillustrated. It does not get into heavyformulas. At the end of each chapteris a quiz which the reader can use tocheck his grasp of the important sub-jects. Answers are provided at theback of the book along with a foursection appendix providing instru-mentation symbols, conversion fac-tors and graphs. The technician in-volved in industrial electronic con-trol systems will find this book a use-ful source of reference.

You neversaw a scope like this

for twice $229.Leader's five -inch LBO -53Bhas a bandwidth runningfrom DC to 10MHz. (Abouttwice the bandwidth of anyother scope in the sameprice range.)

Its sensitivity rating is10 my/cm or better.(About half -again thesensitivity of any otherscope in the same pricerange.)

It has FET vertical andhorizontal inputs, directlycoupled with push-pullamplifiers for no -distortiondisplay. (You won't findthat on any other scope

for the money.)It's the perfect test

companion for Leader'sLCG-388 color bar gener-ator. The only one that'sperfectly stable, theinstant you turn it on.

The LB0-53B: only$229, and now you knowwhat we mean about neverseeing a scope like it fortwice the price.

At your distributor's,along with the LCG-388and other Leader test in-struments. For the distrib-utor nearest you, justdrop a line or call.

Seeing is believing.LEADER INSTRUMENTS CORP.

24-20 Jackson Avenue, Long Island City, N. Y. 11101 (212) 729-7411. . . for more details circle 116 on postcard

Solve Color Register MAIMS .Use Miller 1604 Blue Lateral & Purity Assembly

on any American Rectangular Color Picture Toe

Now register blue, red and green beams simultaneously.A single wheel rotates two magnetic rings in opposite directions toprovide blue lateral convergence. Purity correction is accomplishedby individual adjustment of the two purity rings. The magnetscompensate for mis-registration up to .005" in any direction.

Rn Dealer Net Each: $3.96: Available from distributors' stocks.Write for your copy of Cross Reference Bulletin 1069

J.W. MILLER COMPANY19070 REYES AVE P 0. BO> 5825 COMPTON, CALIF. 90224

See your local distributor for the full line of RF and IF coils, chokes and transformers

AUGUST 1969

...for more details circle 121 on postcard

INTRODUCTORYSPfrcIALS 3 New Motorola HEPTransistor Replacement Kits

Revolutionary! These new kits are the first of a computer -planned series designedto provide you with replacement semiconductors to do the job right...with devicesto satisfy the fast moving and most often needed applications.

"Universal" replacement devices just don't fill the bill any more for many applications.With more and more consumer products using semiconductors...with many of theseproducts becoming increasingly complex...closer tolerances are neededin more and more applications. Our computers have selectedthe right devices for the right jobs!

And we're bringing these kits to you at the right prices!

MOTOROLA

HEPSemiconductors

RF-IF Transistor Replacement KitHUK 6

types (26 units) programmed to replace3,794 original equipment types plus several "universal" devicenumbers. Doesn't cover everything, just the major portion of yourIF and RF out -of -warranty replacement needs!

REGULARLY $32.68SPECIAL INTRODUCTORY PRICE

$23.9530

ELECTRONIC TECHNICIAN/DEALER

qDA

="

MOTOROL A

HEPSeprrlicoricluctors

Foreign Transistor Replacement Kit

LJ r", L' -7 'E"'CIGN Replacements for foreign semiconductorsare hard to find but not with this kit ! 12 types (22 units).Covers over 5,700 device types, including most of nearly 2,000Japanese type numbers. In fact, they'll replace 83% of the foreigntypes listed in our Cross Reference Guide. Quantities of each typeare programmed to give you more of what you need most.

REGULARLY $27.35SPECIAL INTRODUCTORY PRICE

$19.95

-1111111.

MOTOROLA

HEPSemiconductors

RF-IF )Audio ; Transistor Replacement Kit

Foreign ) N92

Hr)" P SF-IF/AUDIO/FOREIGN Computer -programmed to REGULARLY $60.09give you the best replacements for today's complex RF-IF and SPECIAL INTRODUCTORY PRICEforeign applications plus an excellent selection of the most popular

"e39.95

audio devices. 47 units - 23 HEP types - covering the specificnumbers you need most. No odd -balls to gather dust. Replacesover 10,000 specific type numbers.

Get in touch with your HEP distributor now!These special introductory prices are in effectonly while his on -hand inventory lasts!GET HAPPY! GET HEP! FROM MOTOROLA!

AUGUST 1969

MOTOROLA HE( SEMICONDUCTORSP. O. Box 20924 / Phoenix. Arizona 85034

...for more details circle 122 on postcard31

HEP

TECHNICAL DIGESTThe material used in this section is selected from informationsupplied through the cooperation of the respective manufacturers or their agencies.

ADMIRALRadio Chassis 1564 --Power Tuning Circuit Description

The radio can be viewed as a conventional AM -FM unitwith an accessory power tuning or searching package. Dur-ing normal operation B+ is disconnected completely fromthe power tuning section.

The power tuning section itself is divided into two basicsections: control and operate. The control section, whenactivated, samples the IF signals, amplifies them and con -

(CONTROL AMPLIFIER)02.9

0 .

TUNINGEEL ATS2 3

POWER

DIRECTION

2

ODINITUNING

S2.4

UPBUTTONS

02.3DIAL DRUM

SWITCH

02.11C2-27

02.10

MOTORREVERSE

ANTI.SHORT

.a

RA2.6

RA2. SPerm

OFF ON

R2-27

C2.2

trols a power tuning relay S2-3. FM -IF sampling is achievedat the second FM -IF collector of transistor Q4, while AMsampling is achieved at transformer T1-4. In the controlsection, the FM -IF signal receives additional gain throughtransistors Q2-6 and Q2-7. Assume the power tuning upor down button has been pressed. Transistor Q2-7 is main-tained at a controlled bias by threshold controls, RA2-3or RA2-4. IF signals will be amplified and presented to con-trol detector CR2-1. This diode is in the bias circuit of Q2-8, which has been forward biased during power tuning bythe forward contact potential voltage of forward biaseddiode CR2-2. When CR2-1 detects a signal, a reverse -go-ing bias will be presented to Q2-8, turning it off. This amp-lified turn-off signal will also turn off Q2-9, the relay drivertransistor. The relay will release and the motor will stopon station. Transistors Q208 and Q209 draw current onlywhen two conditions are simultaneously present: (a) Powertuning from B5 B-; (b) When no signal (or oscillation) is be-ing detected by CR2-1.

The relay S2-3 has four sets of contacts which controlvarious parts of the radio (only two circuits are shown).With normal reception on station these are:

1. Unmuting the radio by connecting the audio drive tothe input audio amplifier through 11-12;

2. Opening the ground to the motor circuits through 2-3;3. Feeding the AFC control through 7, 8, 9;4. Disconnecting the B+ from the power tuningand ground-

ing the disconnected line through 5-6. During the powertuning these contacts are respectively:

(a) Muting the radio by disconnecting the audio systemthrough 10-11;

(b) Grounding the motor circuits through 1-2;(c) Disabling the AFC control voltage. (The AFC diode

is biased by a connection through the floating ratio detec-tor, the AFC diode is reconnected to a secondary B + lineat C2-3 to avoid detuning.);

(d) Supplying B+ to the power tuning section and powertuning motor through 4-5.

The operation section has a de drive motor controlledby the direction relay S2-2, and the dial drum direction sens-ing switch S2-5 or push buttons. Since it is a de motor, merelyreversing the power leads will reverse 'rotation. The direc-tion relay S2-2 has several unusual characteristics. It hastwo coils connected opposite each other. Secondly, it hasa permeable core. Once the direction switch S2-4 or powertune up or down button has been pressed, the pulse of cur-rent through that respective coil will operate the contactsand will magnetize the core. The direction relay then actsas a double -pole -double -throw switch; the contacts stayin their last position until the core is magnetized oppositefrom the other coil.

The relay S23 applies B + to the entire power tuningsection only during power tuning. Thus, the search motoris controlled by S2-3 relay B+ contacts.

Assume the system is in the standby position, the radioplaying and the power tuning section is at rest. The cus-tomer presses one of the push buttons on S2-4 and the tun-ing relay S2-3 is energized. Immediately, contacts 4-5 onS2-3 apply power tune B+ to the control amplifier and motorcircuits. The motor circuit ground is obtained by S2-3 con-tacts 1-2. If the direction is different from the last opera-tion, direction contacts on S2-4 will cause S2-2 to operatebefore the motor, thus reversing its direction.

When the relay driver transistor Q2-9 located in the elec-tronic control section stops conducting, this indicates thata station has been found. Since the customer's finger hasbeen removed from S2-4, the power tune relay S2-3 willopen and the motor power will stop. In the process, how-ever, C2-26 is quickly discharged by S2-3 contacts 5-6, andthat side of the motor circuit formerly connected to Bis again connected. The B+ side of the motor circuit is leftopen through S2-3 contacts 2-3. It is at this point, that the"stop -error" transistors come into play. Keep in mind thatthe entire operation takes place in a matter of seconds. Whenthe power tune operation started, B + was applied to themotor circuits, stop -error timing capacitors S2-25 and C2-27 had B + applied to their negative sides. Since the posi-tive sides were connected to the main power source, theywere charged. When the tuning action ended with the open-ing of S2-3 and the grounding of the motor B+ side of thesupply, the negative sides of these stop timing capacitorswere grounded. This amounts to moving them in a less pos-itive or more negative direction. This change -of -chargeappears as a negative pulse on the stop timing transistorbases, causing them to conduct heavily. How long they willconduct in milliseconds is determined by the RC time con-stant of the base circuit and this is adjusted through RA2-5 and RA2-6. Heavy current caused by the low collectorresistance flows in both Q2-10 and Q2-11. Depending uponthe direction switching of S2-2, one transistor's currentwill flow directly from S2-3 ground at contacts 5-6 throughthat transistor to emitter B+ , completely external to themotor. Since S2-3 contacts 5-6 are reversed from normalin the stop mode, the motor would tend to turn in the op -

32ELECTRONIC TECHNICIAN/DEALER

posite direction. However, this is not possible because ofthe current limiting of the stop transistor emitter resistorsand inertia of the motor. Braking action occurs due to themotor acting as a de generator while coasting, and the op-posite braking current being passed through it to buck ornull it out.

It is interesting to note the extra contacts necessary onS2-1 push switch in the stop error transistor circuits. If theradio were turned off without the extra contacts, the bat-tery would be discharged through the timing controls. Af-ter the radio is turned off, C2-25 and C2-27 are bled off byR2-27 and R2-28. This is necessary to prevent erratic motormovement when turning the unit on by unpredictable con-duction of Q2-10 and/or Q2-11.

A local -distant switch controls the AM and FM sensitiv-ity of the radio and thus sensitivity of the power tuningunit. The radio is approximately 15 times more sensitivein distant position.

EMERSONAmateur Radio or FM Station Interference

We are all familiar with channel 2 amateur band inter-ference which is resolved by using an effective hi -pass fil-ter connected in the antenna lead-in. For optimum resultsthe hi -pass filter should be connected as close as possible

Put sections flat against 300 -ohm linefrom antenna and tape in place.

High "Q" Trimmer -3 -30 pF

Parallel open ends and connect toone terminal of trimmer ( someon other side I .

To Antenna

NOTE : Dimension "A" -40" at 50 MHZ (six meters )11" at 144 MHZ (two meters )

Inches. 2952 V

V 0.82 for 300 ohm twin leadf = frequency MHZ

to the tuner antenna input terminals. Picture interferencecan also be the result of an FM station and again FM trapsinstalled at the tuner antenna input terminals are effective.A tuning stub trap as shown in the illustration is very ef-fective in minimizing picture interference especially whencaused by a strong ham or FM station located in proximityto the TV receiver.

Note: (1) Slide trap along lead-in until most effective po-sition is found. Tape in place (scotch tape, etc.). (2) The ac-tual physical length required will be less than that calcula-ted because of the loading effects of capacitance at the openends. Reduce length 1/2 in. at a time until capacitor tunesthrough interference.

CORRECTION

The "Color Bar Generator Survey" which appeared inthe July issue of ET/D had a couple of omissions. Withred cheeks and egg on face, we humbly admit our error.

On page 48, the question regarding color bar generatorpatterns was not fully answered. It should also have in-dicated that the Heath IG-28 unit, in addition to the stan-dard 10 bar pattern, provides 12 other patterns includingthe usual 9 x 9 patterns plus a series of 3 x 3 patterns anda 3 -bar pattern which are unique.

The article was continued on page 78 with an answer tothe question concerning the use of IC circuits. This answershould also have indicated that the Heath IG-28 does useIC circuits extensively (10) which has resulted in reducedsize, improved stability, greater reliability and slightlyhigher cost.

NEW Heathkit Solid -StateColor Bar Dot Generator

111slew

Kit IG-28Only $79.95*

Advanced Integrated CircuitryDelivers 12 Patterns PlusClear Raster ... No DividerChain Adjustment ... NoFlicker, Bounce or Jitter

All solid-state construction using Integrated Cir-cuitry No divider chain adjustments Stablepattern display - no flicker, bounce or jitter Produces 12 patterns plus clear raster Instantswitch selection of all functions Exclusive 3x3display plus standard 9x9 display of all patterns Horizontal lines only one raster thick for addedaccuracy Variable front panel tuning for channels2 through 6 Variable front panel positive andnegative video output Frosit panel negative goingsync output Two handy AC outlets on front panel Built-in gun shorting circuit with lead piercingconnectors Front panel switchable crystal con-trolled sound carrier Copper -banded transformerto reduce stray fields Safe three -wire line cord Fast, easy construction with two circuit boards andtwo wiring harnesses

Advanced Design. The new Heathkit lG-28 isone of the most stable, versatile Color and B&WTV service instruments available. In addition tothe exclusive Heath "3 x 3" display of patternsillustrated, it also produces the familiar 9 x 9displays . . . plus a clear raster for adjustingpurity without upsetting the AGC. Fifteen J -KFlip -Flops count down from a crystal controlledoscillator to eliminate divider chain instabilityand adjustment.

Time -Saving Versatility . . . gives you frontpanel tuning for channels 2 thru 6 ... front panelvariable plus and minus video output . . . frontpanel sync output ... two convenient AC outlets. . . built-in gun shorting circuits and grid jacks. . . vectorscope capability . . . crystal controlledsound carrier . . . banded transformer to elimi-nate stray fields ... zener-regulated power supply... safe three -wire line cord ... fast circuit board -wiring harness assembly. For the versatility youcouldn't get before . . . put the new IG-28 onyour bench now.

Kit IG-28, 8 lbs $79.95*

4111111.

Standard9x9 Displays

plusExclusive

Heath"3 x 3" Display

3x3 Dot

r

3x3 Cross Hatch

3x3 Shading

3x3 Color Bars

I

3x3 Vertical

3x3 Horizontal

HEATH COMPANY, Dept. 24-18Benton Harbor, Michigan 49022

Please send my FREE 1969 Heathkit Catalog.

Enclosed is $ plus shipping.

Please send model

Name

Address

City

L

State ZipPrices & specifica-ions subject to change without notice.

*Mail crder prices: F.O.B. factory. TE-200

AUGUST 1989

...for more details circle 113 on postcard

33

1,......."-

but play it safe!Boating can be great fun. It's a great way to promotefamily toget'terness. But sure as fate it's going to happen- the inevitable problem on the water that could turn intoa nightmare. Unless, of course, your boat is equipped withcitizens 2 -way radio to close the distance between youand help instantly when trouble comes.

More than three million citizens radios are now usedin boats, automobiles, farm vehicles, homes, marinas andcampers. To these Americans, citizens 2 -way radio hasbecome a marvelous everyday convenience and a vitalcommunications link. And it costs less than a new set oftires for the family car.

PUBLIC SAFETY COMMITTEECitizens Radio Service Section 2001 Eye Street, N.W.Washingtol, D.C. 20006

ELECTRONICINDUSTRIESASSOCIATION

ELECTRONIC TECHNICIAN/DEALER

AUGUST 1969

TEKLAB REPORT

Sears SilvertoneModel 4168Portable CnInr TVReview the circuits employed in this portable;

they compare with the deiuxe large set

Total television sales in the firstquarter of 1969 reached 3,363,695sets compared with 2,796,074sets in the same period of 1968.Color television's share reached1,604,962 sets according to Elec-tronic Industries Assn.'s mar-keting service department.

The portable color televisionset is taking an increasing per-centage of total color set salesprobably because of their lowercost and the fact that many peoplenow want a second set.

With the portable color setbeing so popular we decided tomake a Testlab Report on theSears Silvertone Model 4168

Sears Silvertone Model 4168 portable color TV.

color portable manufacturedin the United States by WarwickElectronics, Inc.

The cabinet is attractivelystyled with all the customer con-trols conveniently located onthe front panel. This set employsa CHROMIX control not normallyincluded on most sets. The CHRO-MIX control affects the color toneof the picture for either B/W orcolor reception. When the en-tire viewing screen has an over-all monochrome color tone rang-ing from blue to yellowish green,you may not be viewing a colorprogram, but a B/W programwith the CHROMIX control setto either side of its neutral posi-tion. The control