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RE: Mike, Steve, Fender Lover

The coupling caps are the Wonder caps but you have a bunch of caps on both sides so it's hard to tell from the photos but I can look at the schematic.The reason why a coupling can cause a bias drift issue is because they can leak a positive DC voltage from the plate or cathode of the previous stage to the output tube control grid..It only has to be one or two volts to cause problems.We will wait until after you short the inputs and recheck the bias.Also,I would change out those bias pots for some better quality multi-turn type.Mouser has them.


"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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