Howard-Radio-Co-901 电路原理图.pdf

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1、MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS I01PB1 nanio company model- 901 SOCKET VOLTAGE READINGS: AC switch to the socket contacts with a * 0DE GRID - PLATE 20,000 ohm per volt D.C. meter and the line voltage fixed at 117 volts A.C. 12SA7 Mixer 92 92 92 12SK7 I.F.Amp. 3 92 92 ALIGNMENT INFORMATI

2、ON igqQ7nt-44- Each 455 KC I. F. coil has an Iron - Core adjustment protruding from the 50L6GT Output 5,8 92 85 top and the bottom of the I. F. can. Look beneath the chassis to reach the lower I, F. adjustments. Repeat the I, F. alignment operation several times to insure accuracy. Add or remove res

3、istance in the cathode circuit of the 12SK7 tube as the I, F,.gain| indicates. The wire lead running from the loop aerial between the I, F. coils and the gang is important in its placement. Dress this wire tightly to the chassis. Set dial at 1400 KC. and adjust oscillator trimmer which is located on

4、 back of variable condenser, then peak antenna stage trimmer on front section of condenser to 1400 KC. No adjustment is required at the low frequency end, The filter condenser has a common negative, but note it does not return to ground, and is insulated from the chassis. I TO OUTSIDE ANTENNA LOOP ANTENNA AA, AAT !-. ljdv?de z=r I2SA7 I2SK7 I2SQ7 SO LOST 3SZ5GT O 0“O o o o COMPILED BY M. N. BEITMAN. SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN