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R-392 Tube Socket Voltages & Resistances

VOLTAGE AND RESISTANCE MEASUREMENTS

Ref: TM858-71, Figs 74 and 75

NOTE: VOLTAGE is measured with receiver ON
RESISTANCE measured with receiver OFF, power disconnected

1. 28 VDC power input
2. FUNCTION switch at NORMAL
3. RF GAIN and AF GAIN at max clockwise position
4. Tuning controls to 2.000 MHz
5. Voltages/Resistances measured to ground w/ VTVM
6. Headphones, antenna and ground disconnected
7. Resistances in ohms
8. Resistance measurements with tubes IN sockets.
9. NC == no connection
10. AGC switch at OFF position
11. * indicates BFO ON, FUNCTION at SQ, AGC to CAL
12. "A" depends on IF GAIN BIAS ADJUST SETTING
13. DIAL DIM to ON

====================================
V201 26A6 1st RF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.77 3.3 meg
2 .21 18
3 0 0
4 28 2.3
5 25.7 1075
6 25.7 1075
7 .21 18
------------------------------------

====================================
V202 26A6 2nd RF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.82 3.4 meg
2 .05 19
3 0 0
4 28 2.4
5 25.7 1075
6 25.7 1075
7 .05 18
------------------------------------

====================================
V203 26C6 1st MIXER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.08 100K
2 1.8 3.2K
3 0 0
4 28 3.2
5 NC NC
6 NC NC
7 26.7 1050
------------------------------------

====================================
V204 26C6 2nd MIXER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.04 100K
2 1.8 3.3K
3 0 0
4 28 3.2
5 NC NC
6 NC NC
7 26.7 1180
------------------------------------

====================================
V401 6AJ5 1st Crystal Oscillator
------------------------------------
PIN VOLTAGE RESISTANCE
1 -1.5 100K
2 .1 10
3 12 10
4 6 2
5 28 1200
6 28 1200
7 .1 10
------------------------------------

====================================
V402 6AJ5 2nd CRYSTAL OSCILLATOR
------------------------------------
PIN VOLTAGE RESISTANCE
1 -1.5 100K
2 .1 10
3 6 2
4 0 0
5 28 1200
6 28 1200
7 .1 10
------------------------------------

====================================
V501 26A6 1st IF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.8 4.5 meg
2 0 0
3 28 2.6
4 0 0
5 24.5 1K
6 24.5 1K
7 0 8
------------------------------------

====================================
V502 26A6 2nd IF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.4 4.5 meg
2 0 0
3 28 2.6
4 0 0
5 26.5 1K
6 26.5 1K
7 .8 6
------------------------------------

====================================
V503 26A6 3rd IF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 0 2.2 meg
2 0 0
3 28 2.6
4 0 0
5 26.5 1K
6 26.5 1K
7 3.6 10K
------------------------------------

====================================
V504 26A6 4th IF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 0 2.2 meg
2 0 0
3 28 2.6
4 0 0
5 26.2 1K
6 26.2 1K
7 3.6 10.2K
------------------------------------

====================================
V505 26A6 5th IF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 0 2.2 meg
2 2.9 8K
3 28 2.6
4 0 0
5 26.5 1K
6 26.5 1K
7 2.9 8K
------------------------------------

====================================
V506 26A6 6th IF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.9 2.2 meg
2 0 0
3 28 2.6
4 0 0
5 24.5 1K
6 24.5 1K
7 0 0
------------------------------------

====================================
V601 12AU7 IF CATHODE FOLLOWER
1st RF AGC RECTIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 0 1 meg
2 0 1 meg
3 27 (5.5*) 1.8K
4 28 2.6
5 14 12
6 26.5 2.5
7 -.1 2.2 meg
8 .6 520
9 21 12
------------------------------------

====================================
V602 12AU7 SQUELCH RECTIFIER
IF AGC RECTIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.98 2.5 meg
2 -.98 2.5 meg
3 0 0
4 28 2.6
5 14.2 13
6 0 1 meg
7 0 1 meg
8 27 (5.5*) 1.8K
9 21 12
------------------------------------

====================================
V603 12AU7 DETECTOR-NOISE LIMITER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.5 120K
2 -.5 120K
3 0 1.4
4 14.2 13
5 0 0
6 -.6 470K
7 -.6 470K
8 .2 560K
9 6.6 12
------------------------------------

====================================
V604 26A6 BEAT FREQUENCY OSC
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.8 (-1.45*) 1.5 meg
2 0 0
3 28 2.6
4 0 0
5 0 (25.5*) inf (1K*)
6 0 (28*) inf (1K*)
7 0 .2
------------------------------------

====================================
V605 6AJ5 SQUELCH CONTROL
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.3 (-1.1*) 1.5 meg
2 0 inf (0*)
3 6.3 2.6
4 0 0
5 28 9K
6 28 2.6
7 0 inf ((0*)
------------------------------------

====================================
V606 6AJ5 1st AF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -1.1 10 meg
2 0 0
3 14 5.2
4 6 2.6
5 11.4 22
6 14.5 47K
7 0 0
------------------------------------

====================================
V607 6AJ5 PHASE INVERTER
------------------------------------
PIN VOLTAGE RESISTANCE
1 3.65 2.2 meg
2 5.2 10K
3 6 2.5
4 0 0
5 21 10K
6 21 10K
7 5.2 10K
------------------------------------

====================================
V608 26A7GT 2nd AF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -.25 470K
2 0 0
3 -.25 470K
4 28 1800
5 28 1800
6 28 2.6
7 0 0
8 28 1800
------------------------------------

====================================
V609 26A6 AGC IF AMPLIFIER
------------------------------------
PIN VOLTAGE RESISTANCE
1 0 2.2 meg
2 0 0
3 28 2.6
4 0 0
5 26.5 1000
6 26.5 1000
7 0 0
------------------------------------

====================================
V701 12AU7 MULTIVIBRATOR
------------------------------------
PIN VOLTAGE RESISTANCE
1 26.5 (20.5*) 12K
2 0 (3.1*) 120K
3 15 (0*) inf (0*)
4 28 2.6
5 14 12
6 26.5 (21.5*) 4700
7 0 (3.4*) 120K
8 XXX (0*) inf (0*)
9 21.5 12
------------------------------------

====================================
V702 26A6 200KC Crystal OSC
------------------------------------
PIN VOLTAGE RESISTANCE
1 0 (4.1*) 1 meg
2 15 (0*) inf (0*)
3 28 2.6
4 0 0
5 26.5 (22*) 10K
6 26.5 (18*) 47K
7 15 (0*) inf (0*)
------------------------------------

====================================
V703 12AU7 HARMONIC AMP/DISTORTER
------------------------------------
PIN VOLTAGE RESISTANCE
1 26.5 (12*) 12K
2 0 8
3 15 (0*) inf (0*)
4 14 12
5 0 0
6 26.5 (23.5*) 12K
7 0 (-3*) 100K
8 15 (0*) inf (0*)
9 7 12
------------------------------------

====================================
V801 26D6 VFO MIXER
------------------------------------
PIN VOLTAGE RESISTANCE
1 -1.8 80K
2 0 0
3 28 3.8
4 0 0
5 28 38
6 28 35
7 0 3.6
------------------------------------
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