oneplustwo wrote:Pinnocchio wrote:I had this issue as I remember... Play with one of the other pots slowly and it should start getting some traction... I would personally unplug the power then measure each trimpot of the working amp and adjust the pots so they read just about the same resistance on the second amp. Fire up and do the final adjustments.
BTW, leave the amp running for at least 15 min since with the heat, the settings will drift a little and you'll need to adjust again.
Where are you measuring trim pot resistance?
Directly under the board would be ideal but looking at the schematics, you can probably measure VR3 on R26 and R23 (check schematics for proper side of resistance). VR1 from D2 cathode and D1 anode. VR4 can be measured from D1 anode and Q1 Source pin I believe