General-Electric-Co-P790B 电路原理图.pdf

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1、5.6K VOLUME R-21 MOST-OFTEN-NEEDED 1961 RADIO SERVICING INFORMATION GENERAL ELECTRIC Models P790A.B, P791A, B BOTTOM VIEWS I *2V ( r 1C7 r.o: i NOTES, -1n *) ADJUST FOR C BE MAX. AT 1400 KC WHILE ROCK NG OSCILLATOR COIL I.F. transformers E - EMITTER *3 B - BASE C - COLLECTOR ADJUST FOR MAX. AT 580KC

2、 WHILE -ROCKING GANG PEAK AT J55kC| 1. UNLES OTHERWISE NOTEO.* CAPACITORS MORE THAN I s=MMF CAPACITORS LESS THAN lMF RESISTORS ARE (/2 WATT K =1000 2. V0LTAGE t CURRENT READINGS ARE AVERAGE UNDER NO SIGNAL CONDITIONS. VOLTAGES ARE POSITIVE WITH RESPECT TO GROUND. 3.SIMILIAR APPROVED TRANSISTORS MAY

3、BE USED. _ 4. VOLTAGES SHOWN IN CD ARE FOR PNP TRANSISTORS IN TR5 TR6. 5. CI4 =.02MFD, RI8 IS REPLACED By jumper with dynamic speaker. CI4 = IMFD,RI8 IS IK WITH MAGNETIC SPEAKER. STEP 3/ STFPP STEP I 1 6.IF TR3 IS 2N293 OR 2N292.C7 GOES TO GROUND, 7FOR NPN TRANSISTORS IN TR5 TR6 A. JUMPER A TO B B. JUMPER C TO D 8,FOR PNP TRANSISTORS IN TR5*TR6 A. JUMPER A TO D B. JUMPER BTOC 9RESISTANCE ACROSS OUTPUT TRANSFORMER IS 45-rv WITH Dynamic speaker, reading WITH MAGNETIC SPEAKER IS 85 6-10 MA 53 收音机爱 好者资料库 RadioFans.CN