Emerson-Radio-and-Phonograph-Corp-EC-425 电路原理图.pdf

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1、MANUAL OF 1942 MOST POPULAR SERVICE DIAGRAMS R2, R6 R7, R8 Rll Cl, C2 C3, 06 C4, C15 C5, C1J C6, C7, C8, C9 07, 08 20,000 ohm M watt carbon resistor 15 megohm M watt carbon resistor 140 ohm U watt wire-wound resistor 3 megohm Y watt carbon resistor Volume control .5 megohm 500,000 ohm U watt carbon

2、resistor 200,000 ohm U watt carbon resistor Two-gang variable condenser 0.002 mf, 600 volt tnbular condenser 0.0002 mf, 600 volt tubular condenser Trimmers, part of variable condenser Trimmers, part of i-f transformers 0.05 mf, 200 volt tubular condenser 0.05 mf, 400 volt tubular condenser 0.02 mf,

3、400 volt tubular condenser 0.2 mf, 200 volt tubular condenser. VOLTAGE ANALYSIS EXTERNAL ANTENNA a CONNECTION Voltage at 35Z5 ca,thod,eTV. Voltage across speaker field32 Voltage across pilot bght4.5 soils. Emerson Radio MODELS: EC-296, EC-301, EC-314, EC-315, EC-327. EC-336, EC-347, EC-353, EC-366,

4、EC-242, EC-376 and EC-425 l-f Alignment Swing the variable condenser to the minimum capacity position. Feed 455 kc to the grid of the 12SA7 tube through a .01 mf condenser and adjust the four i-f trimmers for maxi- mum response. Note: The grid of the 12SA7 tube is connected to the stator lug of the

5、rear variable condenser section. Connection may be made with a test clip. R-f Alignment Set the dial pointer at 140. Set the signal generator at 1400 kc and feed its output into a loop of wira about 12 inches m diameter. Hold this radiating loop about 12 “cheir“mf*Sd parallel to the receiver loop an

6、tenna. Advance die output of the Scmal generator until deflection is obtained on the output meter. Adjust first the oscillator trimmer (on front section of variable condenser) then the antenna trimmer (on rear section of varia ble condenser) for maximum response. C4 I2SA7GT I.F PEAKED AT 455 K.C. I2SK7GT I2SQ7GT 50L6GT OUTPUT TRANSFORMER ON SPEAKER CAPACITY C0UPUNS W0UN0 IN COIL 35Z5GT SPEAKER FIELD LINE SWITCH ON VOLUME CONTROL COMPILED BY M. N. BEITMAN. SUPREME PUBLICATIONS m 收音机爱 好者资料库 RadioFans.CN