Heat and cool (inverted can of computer/keyboard duster) the bias transistor (may have to lift it off of the heatsink) to see if it makes a difference in the distortion.
When testing, you need to change one variable at a time. Changing the gain position changed both the position of the control AND the output level. That makes it difficult to know which made the difference.
When testing, you need to change one variable at a time. Changing the gain position changed both the position of the control AND the output level. That makes it difficult to know which made the difference.
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