Mod 101 - Power Tube Bias Supply Voltage Tests; Bias Supply Voltage Measurements

Voltages measured from test point to ground
with no signal, bias pot turned all the way
to cold and the following front panel
settings:
POWER: ON
STANDBY: (UP POSITION)
BASS: “0”
TREBLE: “0”
VOLUME: “0”
T7
T8
220K220K 1.5K1.5K
1N4007
2.7K
2.4K
2
2
µ
F
5
0
V
1N4007
-280 mVDC
52.7 VAC
4.3 VDC
47.3 VAC
519 VDC
3 VAC
-4.17 VDC
0 VAC
-48 VDC
0 VAC
-48 VDC
0 VAC
R(BIAS)
See Assembly Drawing 22
POWER TUBE BIAS SUPPLY
5
A