Howard-Radio-Co-802 电路原理图.pdf

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1、*#0/7 ALIGNMENT PROCEDURE Wave-Band Switch Position Position of Dial Pointer Signal Generator Frequency Signal Generator Connection See Note Trimmers Adjusted (In order shown) Trimmer Function Check for Image at KC 540 465 Grid of 12SA7 A IF MC 14 M3 14 MC Ant. (Brown) B 5,A6 Osc. Ant. 13 MC KC 1400

2、 KC 1400 KC Ant. (Brown) 7 Osc. A- Each step of the alignment should be repeated In the original order for greater accuracy. Keep output from Signal Generator low. The I.F. trim mers are reached through the two holes on the top of each I.F. can. B- When aligning the short wave bands, do not ad just

3、to the IMAGE frequency. For example, If the adjustment Is correctly made at 14 IK, then a weaker image will be heard at 13,070 KC, In other words 930 KC less on the dial. The tubes are connected In series In the order as shown by the schematic diagram. The dual section filter condenser has a common

4、negative, but note that It does not return to ground as the can Is insulated from the chassis. SOCKET V0LTA6E READINGS Voltage taken from B- with line voltage at 117 V. A.C. High voltage reading off rectifier = 115V. Drop across speaker field * 29V. Use at least a 1000 Ohm per volt meter. High volta

5、ge reading off rectifier = 121V. Howard Radio Co. * Socket Terminal Number. COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS Hode1 802 60 TUBE FUNCTION CATH. SG. PLATE 12SA7 Mixer * 92 4 92 3 12SK7 I.F. Amp 2.1 5 92 6 92 8 12SQ? Det. 42 6 50L6GT Output 6 8 92 4 82 3 35Z5GT Rectifier 121 8_ 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN