RCA-Victor-Co-Inc-8V7 电路原理图.pdf

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1、MANUAL OF 1949 MOST-OFTEN-NEEDED RADIO DIAGRAMS MEASURED WITH 3V. FIXED B|AS- K -4-0.6XU-200 y SAIN |*5SKC| A&S KC Ici ycz *466 12-17 CATUODE CURRENTS (1) 6SAT 9.3 MA Z) 6SK7 II. 9 (3) 6SG.1 0.4 (4) 6SQ7 0.4 (5) 6V6&T 19.0 (6) 6V6&T 19.0 (V 6Y5GT C1.5 2.WPET-AVC-FHIMV b$QP rigni 4 700A T T3 RI2 ci6

2、C lOMES.I -005 * loMf 6V6GT an OSCILLOSCOPE CONN. VERTICAL ”Hr THIS POINT VERTICAL “0 TO CHASSIS 1 4 -1 A-F- Ri! 650.7 270KS COIL RESISTANCES LESS THAN 1X1. NOT SHOWN RANGE. 3W. VIEWED FROM FRONT 4 IS q, SHOWN IN PHONO- J Cmin.hishs) MAX- V C/CLOCKWlSE. POSITION. 7 RECT- T4- 6X5 ST CZIB C2IC IJ20MF

3、a_30MF I I VOLTAGES -SHOULP HOLP WITH|M 207# WITH 117 V- A C-SUPPLY RCaViCTOR MODEL 8V7 77V. 45S KC TOP & BOTTOM & /esKh H C2 (ANT. 1400 KC X.CA (OSC.) p-V_TUN|NG COND. /TXTmounting plate J (ll) HiNSULATED FROM -c/ CHASSIS.) I I capacityi bddkc -2F1-*- if turns SOME INSTRUMENTS HAVE . 2* TURNSJ : 77

4、V1 Chassis No. RC-615 Alignment Procedure Cathode-Roy Alignment is the preferable method. Connections for the oscilloscope are shown on the Schematic Diagram. Output Meter Alignment.If this method is used, connect the meter across the voice coil, and turn the receiver volume control to maximum. Test

5、 Oscillator.For all alignment operations, connect the low side of the test-oscillator to the receiver chassis, and keep the oscillator output as low as possible to avoid a-v-c action. Connect high side of toet oscillator to Tun# test oscillator to Turn radio dial to Adjust the following for maximum

6、peak output 6SK7 grid m series with .01 mfd. 6SA7 grid in series with .01 mfd. 455 kc. Quiet Point at 550 kc. end of dial Top and bottom (2nd l-F Trans.) T-2 Top and bottom (1st l-F Trans.) T-l 1,400 kc. 1,400 kc. C4 (osc.) C2 (ant.) Primary lead on loop m series with 200 mmfd. 600 kc. 600 kc. L2 (o

7、sc.) Rock gang Repeat steps 3 and 4 Critical lead Dress: 1. Dress speaker cable leads down next to chassis. 2. Dress output plate capacitors next to chassis. 3. Dress plate lead of output tube away from grid of audio amplifier. 4. Dress all a-c leads away from volume control down next to chassis, 5. Dress lead from top tap of volume control to range-tone switch along front apron of chassis. .6. Dress R12 and R15 down near chassis base. o PHONO tone 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