Emerson-Radio-and-Phonograph-Corp-120105B 电路原理图.pdf

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1、MANUAL OF 1951 MOST-OFTEN-NEEDED RADIO DIAGRAMS EMERSON RADIO & PHONOGRAPH CORPORATION MODEL: 625 CHASSIS MODEL: 120105B TYPE: Automatic record-changer phonograph TYPE OF TUBES: 112SQ7 audio amplifier 150L6GT power output 135Z5GT rectifier POWER SUPPLY: 60 cycle a.c. only VOLTAGE RATING: 105-125 vol

2、ts POWER CONSUMPTION: 30 watts CURRENT DRAIN: 0.25 amp. at 117 volts a.c. DISASSEMBLY INSTRUCTIONS 1. Remove two push-on knobs at front of cabinet. 2. Disconnect phono-motor leads by unscrewing wirenuts. 3. Remove phono pickup plug. 4. Unscrew two front cabinet feet and two chassis bolts at sides of

3、 cabinet. Lift out chassis. 5. Remove two base plate screws at center of chassis. CONDITIONS FOR VOLTAGE AND RESISTANCE READINGS 1- Voltages indicated are positive d.c., resistances are in ohms, unless otherwise indicated. 2. Measurements made with voltohmyst or equivalent. 3. Line voltage maintaine

4、d at 117 volts a.c. for voltage measurements. 4. Socket connections are shown as bottom views, with measurements from pin to common negative. 5. Volume control at maximum, for voltage measurements. 6. Nominal tolerance on component values makes possible a variation of 15% in voltage and resistance r

5、eadings. 7. On the diagram, upper values are voltage and lower values are resistance. NC denotes no connection, K is kilohms megohms, INF is infinity. Resistances marked * are measured to pin 8 of rectifier (B-j-). * MEG is NOTE-RES. MARKED tt MEASURED TO PIN 8 OF V-3 BOTTOM VIEW-CHASSIS I20I05B V-l I2SQ7 5MEG V-2 50L6GT 收音机爱 好者资料库 RadioFans.CN