1St Stage Tube Oscillation Test Knobs Setting:; Reverb Oscillation Test Knobs Setting - Vox AC15C1 Service Manual

VOX AC15C1
st
1 stage Tube Oscillation Test knobs setting:
MASTER
VOLUME TONE CUT
Max
Input: Not connected.
Confirm there is no oscillation, with this setting.
When there is an oscillation, replace 1st stage tube with 2nd or 3rd stage tubes. If it
doesn't solve, try another 12AX7 tubes.

Reverb Oscillation Test knobs setting:

MASTER
VOLUME TONE CUT
Max
Input: Not connected.
Confirm there is no oscillation, with this setting.
TREMOLO
DEPTH SPEED
Min Min Min
TREMOLO
DEPTH SPEED
Min Min Min
Knob Posittions
REVERB TOP BOOST
LEVEL BASS
Min Min
Knob Posittions
REVERB TOP BOOST
LEVEL BASS
Max Min
NORMAL
TREBLE VOLUME VOLUME
3 Max Max
O'clock
NORMAL
TREBLE VOLUME VOLUME
Min Min Min