Packard-Bell-Co-7R4 电路原理图.pdf

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1、VOLUME R-22, MOST-OFTEN-NEEDED 1962 RADIO SERVICING INFORMATION MODEL 7R4 RADIO Model 7R4 is an AM-FM radio receiver containing seven electron tubes and three crystal diodes. The FM section contains AFC circuitry. A phono input socket is provided at the rear of the set. Frequencies AM radio: 530 kc

2、to 1620 kc; l-F 455 kc FM radio: 87.5 me to 108.5 me; l-F 10.70 me V-3 fcAUl AM OCT FM DRIVER T Crl _L I ,0KI_ P CI3 X tv re toK-r wv N54I 30C)i T Jr c,fe -n5MFD t bov PL 2 o) PHONO 7 I29017 T CI7C CiTD1 SI I ?is / j I J CHASSIS mho NOTE 1 SWITCH SHCwtl IN AM POSITION 2 A.l VOLTAGES EKCCFT tBEI. N F

3、M POSITION 3 ALL IF*S PlNl iREEN DOT 4 SWITCH SEOL/ENCE AM FM PH 5 AM IF 455c KC , FM- F-IOTMC t-Tul. NS RANGE AM 535- V20KC FM 88 06MC FM 7 PH C_LRl6 100 -T470K 330K s 4T0K CZ4 i j Z20K J sezs C26 1 Zoo T2 RED lir vy blk sw on tone CONTROL i Z5v i V6 GCA4/EZ81 , RECTiHER SCO * ysov sw liow / 3_Ocaie_Loc3 cl A C3iD | -T 40MFD -T 40MFDT 20MFD 3S0V . 350V 75W - IB P: 1 11 Oi r kj ai uj &JJ a. to z t z FM ANT l-F FM * f n 4 * - Y 74 CHASSIS 7R4, TOP VIEW 收音机爱 好者资料库 RadioFans.CN