RCA-Victor-Co-Inc-2-R-51 电路原理图.pdf

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1、MANUAL OF 19S3 MOST-OFTEN-NEEDED RADIO DIAGRAMS rca Victor Service Data CRITICAL LEAD DRESS A-C Operated Radio Receiver MODELS 2-R-51, 2-R-52 Chassis No. RC1119 1. Oscillator coil should be centered in space provided and have at least V4 inch between winding and chassis. 2. The filament wiring shoul

2、d be dressed down on chassis and away from audio leads and audio coupling con densers. 3. The I.F. plate and grid leads, including the 2nd I.F. diode lead should be as short as practical. Tuning Range .540-1600 kc Intermediate Frequency .455 kc Tube Complement: (1) RCA 12BE6.Converter (2) RCA 6BJ6 .

3、I F. Amplifier (3) RCA 12AV6.Det.-AVC-A.F. Amp. (4) RCA 6AK6 . Output RCA Stock No. 77292 .Rectifier Top View 4. The output plate by pass condenser should be dressed against the side of the chassis and away from the 1st audio grid condenser and the diode filter resistor. 5. Output transformer primar

4、y leads should be dressed away from the selenium rectifier. 6. The loop antenna should be accurately centered in its position on the fishpaper cover. The ends must not pro ject beyond the fishpaper. ALIGNMENT PROCEDURE Test-OscillatorFor all alignment operations, connect the low side of the test-osc

5、illator to the receiver chassis, and keep the oscillator output as low as possible to avoid a-v-c action. On a.c. operation an isolation transformer (115 V./115 v.) may be necessary for the receiver if the test oscillator is also a.c. operated. Output MeterConnect meter across speaker voice coil. Tu

6、rn volume control to maximum. Step Connect the high side of test-oscillator to Tune test-osc. to Turn radio dial to Adjust the following for max. output 1 6BJ6 I-F grid through .01 mfd. capacitor 455 kc Quiet- point 1600 kc end of dial T2 (top and bottom) 2nd I-F. trans 2 Stator of CIA through .01 m

7、fd. T1 (top and bottom 1st I-F trans. 3 Short wire 1620 kc Min. cap. osc. trimmer C1B-T 4 placed near loop to 1400 kc 1400 kc signal ant. trimmer C1A-T 5 radiate signal Repeat steps 3 and 4 Bottom View Note: In some receivers, R2 is 22 ohm, 1/2 w- composition 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