Noblitt-Sparks-Industries-Inc-RE-242 电路原理图.pdf

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1、MANUAL OF 1949 MOST-OFTEN-NEEDED RADIO DIAGRAMS ARVIN RADIOS - MODELS 547 AND 547A CHASSIS RE - 242; 5 TUBE AC - DC ALIGNMENT PROCEDURE PRELIMINARY: Output meter connection . Across loudspeaker voice coil Output meter reading to indicate 200 milliwatts (standard output) . 0.8 volts Dummy antenna to

2、be used in series with generator output . See chart below Connection ot generator output lead . See chart below Connection of generator ground lead . Floating ground Generator modulation . 30% 400 cycles Position of Volume Control . Fully clockwise Position of dial pointer with variable fully closed

3、 . Horizontal Place the set loop in the same position with respect to the rear of the chassis, and the same distance from the chas sis, as it would be with the set mounted in the cabinet. Position Frequency Dummy Generator Trimmers Adjusted Function of of Antenna Output In Order Shown of Variable Ge

4、nerator Connection For Maximum Output Trimmer Open 455 .05 mfd. 12SA7 Grid Top of 2nd Cl, Trimmers on Osc. Variable Condenser Ant. 600 600 *Test Loop Check Point (If weak, adjust variable plates for maximum output.) Standard Hazeltine Test Loop Model 1150 or 3 turns of wire about 6 in diameter, plac

5、ed about one foot from the set loop. The alignment procedure should be repeated in the original order for greatest accuracy. Always keep the output from the signal generator at its lowest possible value to make the AVC action of the receiver ineffective. OUTLINE FOR TUBfc LAYOUT 12 S A7 I2SK7 I2SQ7 50L6GI 122 V TO FLOATING GROUND AND ARE TAKEN WITH NO SIGNAL. A.C. LINE VOLTAGE AT 117 VOLTS. WHERE NO READING IS GIVEN, THE VOLTAGE IS ZERO OR TOO LOW TO READ. 收音机爱 好者资料库 RadioFans.CN