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MOTOROLA: NO H.V.

When no high voltagc can bc found at thc sccond-anodc connector of TV reccivers using thc RTS-544 chassis, a good possibility is that R*u, thc 27.000-ohm high-voltagc dccoupling rcsistor. has becomo open. The obvious rcmcdy is rcplacemcnt of this unit with an-othcr 27.000-ohm unit. ratcd at 1 watt. Howcver. whcn this occurs. another prccautionary chcck is callcd for to prevcnt rcpcat failurc. If thc 3A3 high-voltagc rectifier has bccome gassy, R-m will tcnd to overhcat. paving thc way to breakdown. The 3A3 should accord-ingly bc chcckcd for possible gassiness whcncvcr thc resistor has failed.

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PHILCO: LINĘ RADIATION

Whcn other rcccivers arc operated from thc same a.c. source to which a TV set using thc 9L35 chassis is con-nected. it is possible that signals from thc 9L35. whilc it is operating. may fced back into the power linę, causing intcrfcrcncc to other units. If this con-dition is discovcred, climinating thc symptom at the sourcc is casily ac-complishod by adding a bypass capaci-tor to thc Philco TV receivcr. A con-venicnt way of doing this is to wirc a .047-^f.. 400-volt capacitor from lug 8 of sockct 1 on thc main chassis to near-by lug 7 of terminal board 2. Latcr vcrsions of this receiver, beginning with run 4. havc such a capacitor added.

BC603 FM RECEIVER

20.*77.9 mc. Equipped with 10 push butlom for selecling chonnełs. Cont. voriobl# twning Ov#r the entire ronge. Unit complef e with tubes, bu4t-in toud sp#ok#r. squdch Circuit. h#od phone loclrt, schemof ic diogrom on bottom of CO»#. Appro*. _w#ight 34 Ibs.

Ut#d Good...............$9.93

UW N#w................$11.93

DM 34 Dyncmotor 12 or 24-yolt D.C.. . .#och $3.93 BC-604 Tronwnilfer; 20.-27.9 mc

NEW...................$4.93

Crystols (set of 80) for 8Có04 tronsmitler. 20 to 27.9 mc

Prk#............................$3.00 ptr set

Monuol with schemotic for BC603/BC604.

Pric#..............................$1 ,OQ eoch

DM35 DYNAMOTOR: 1 2 Volt input. output 625V. .225A

Used with BC-604........................$9.93

12VEkor Dynomotor: Output 440V. 200A. NEW $7.93

PU 20 POWER SUPPLY

6. 12 or 24-yolt (»p#cify vohogt).

Used with BC659 ond 620............$6.93 eoch

TIST SCOPI—SYNCHR OSCOPE— PULSI ANALYZKR

ID-59/APA.I I. iot# production. Modulor subossembly construc-tion. Vid#o omplifler is Bot to 4 mc 3BPI pr#s#ntotion. Test-scope sowtooth 25-20,000 cy. Nos oll nor mol test-uope Controls. As synchroscope ond puls# onolyz#r, ocCepts posithr# or negotiy# puls-•s. Video deloy Circuit p#rmits leoding #dge of puls# to b# s##n. Colibrofed-diol horizontol shift meoiures puls# durotions from 0.5 to 100 mkros#conds. Sinawo v#-o*ciNotor cotibrotor m#osur#s r#curr#nc# rot#» from 200 to 6000 ppi occurot# within 0.4%. 6uilt-in power supply r#quir#s 1 1 5v. 400 cy, 196 wotts. Ex-temol 60 cy power supply moy b# modę to fumish plus 350 ond —1300 vdc ond 6.3 voc. In #xc#U#nt condi-tion, with oll 19 tub#s, schemotk with ports volu#S, ports-locotion pidures, opero!ing instructioni, lh#ory #x-plonotion, ond molnłenonce chorts. Shipping weight 60 Ibs. Used, good.    Prk# #och $19.30

NO C.O.D/s. REMIT FUll AMOUNT WITM ORDER. All PRICES F.O.B. PASADENA.

SYLYANIA: 10DE7 FAILURE

When thc vertical-oscillator and out-put tubę (V*. 10DE7) in rcceivcrs using the 1-537-5. -6. or 1-539-3. -4 chassis fails, correction of thc fault should not stop with the rcplacemcnt of the tubc itself. With thc Circuit used in thc orig-inal version of these chassis, life ex-

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pcctancy of thc tubc is somewhat rcduced. Howevcr, a simple changc in-volving two resistors. madc in latcr production (C03 rcvisions, beginning with chassis serial numbers 537503 and

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ELECTRONICS

v.T.t. creinin* leede lo aucceaa me lechnlclana. field enetneere. apeclaltata In eommuntcatlona. sruided miaallea. Computer a. radar and automa-tion. Basie and advanced couraea In theorv and laboratory Aaaoclate deffree in elrct/onlce In 20 montha. B.S. In elertrontc enfflnaerlDfr obtalnable. tXTl) accredlted. G.l. aporoved. Graduatea In all branchea of electronlce wiu» major companlea. łtlart Krltruary,    litirm*. rampua. llllOi

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