What the heck is this, mystery trim pot on a 50/50.

[killerburst]

 

[vick1000]

Bias mod atempt?

 

[killerburst]

That is my guess. Makes me nervous. Going to have to meter this thing out and see what's going on.

 

[killerburst]

The only schematic I can find is barely legible. Anybody know where there is a clean, readable copy?

 

[vick1000]

See if you can't contact Mesa about it, and find a Mesa tech to text those pics to.

 

[DeathMagnetic]

I would think there should be a bias adjustment for each channel / side