Fender Super Champ Bias Trim Pot ?

[stratburst]

Has anyone installed a bias trim pot in their Fender (Rivera era) Super Champ? I found several posts that recommend it but not much more info than that.

[stokes]

Look at the schematic,you will see a 13k and 10k resistors forming a voltage divider in the bias voltage circuit,I would replace the 13k with a 25k cermet pot,wire one outer leg of the pot to the center leg and connect them to ground,the other outer leg gets connected to the juncture of the 10k resistor.