General-Electric-Co-GD63 电路原理图.pdf

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1、MANUAL OF 1939 MOST POPULAR SERVICE DIAGRAMS ci Jr iJ +S icM cji RIO L TC30c Wi Rll J 1C30a iL6G a7 6AeG 6QTG USED ON 25 CYCLE RECEIVER ONLY Set test oscillator to 455 and apply signal to the control grid of the 6A8G tube through a .05 mfd. capacitor. Do not remove the grid lead from the 6A8G. Xeep

2、the test oscillator output as low as possible to give a readable output. Adjust all four I.F. trimmers for maximum output. Wave Trap Alignment Leave the test oscillator set to 455 K.C. and connect one output lead to the receiver chassis and the other through a 250 mmf. capacitor in series with 200 o

3、hms to the receiver antenna lead. Adjust (C-1) for minimum output. jR.F. Alignment Use the same dummy antenna (250 mmf. and 200 ohms) with 1500 K.C. input, adjust the oscillator trimmer (C-13) and antenna trimmer (C-12) for a maximum output. PrecautionOne side of the power supply is connected to the

4、 chassis through a .25 mfd. capacitor. If signal generator is AC operated, connect a .05 mfd. capacitor in the ground side before connecting it to the receiver chassis. DET. KtZ a AUDIO DRIVER COHV. a 0. RECTIFIER 455 K.C. S P CIS CIS ANT. OSC. VOLTAGE CHART Tube No. 6A8G 6K7 6Q7G 25L6G 25Z5 Plate t

5、o B volts 112 112 55* 130 Screen to B volts 75 i 75 115 Cathode to B volts 0 0 0 7.5 136 Cathode Current MA 6.6 1.4 0.5 40 50 Filament Volts 6.0 6.0 6.1 24.5 24.0 Line Voltage120 AC. No signal input * Measured on 250-volt scale. On DC, voltages are about 15 per cent lower. General Electric Symbol I

6、Description Cl Wave trap trimmer C2-C6 Antenna trimmer strip C7-CU Oscillator trimmer strip Cl2, C13 Tuning condenser C14 47 mmf., mica capacitor C16 .25 mfd., paper capacitor C18 .25 mfd. paper capacitor C19 .05 mfd., paper capacitor C22 470 mmf. mica capacitor C23, 24 .002 mfd., paper capacitor C2

7、5 330 mmf. mica capacitor C27 .005 mfd. paper capacitor C28 .01 mfd. paper capacitor C29 .001 mfd., paper capacitor C30a -20 mfd., dry electrolytic C30b 40 mfd., dry electrolytic C30c 20 mfd. dry electrolytic C32 .02 mfd. molded capacitor Ci54 15 mfd., dry electrolytic C35 .006 mfd., paper capacitor

8、 R1 47,000 ohm, carbon resistor R2 10,000 ohm, carbon resistor R3 Ballast resistance, 49A R4 2.2 megohm, carbon resistor R5 470,000 ohm, carbon resistor R6 2.2 megohm, volume control R7 15.0 megohm, carbon resistor R8 220,000 ohm, carbon resistor RlO 1.0 megohm, carbon resistor Rll 2200 ohm, carbon resistor R12 180 ohm. carbon resistor R13 68,000 ohm, carbon resistor Tl 1st I.F. transformer T2 2nd I.F. transformer T3 Output transformer* T4 Osc. transformer T6 I Antenna transformer_ 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