Failsafe for bias trim pot on Ampeg B25

[seven]

Hi all,

I have a '72 Ampeg B25 I am refurbing.

I want to put in a trim pot to allow for adjustable bias.

I know I can just put a trim pot in (say, 50k with a ~22k resistor in series) but I want to have a failsafe to prevent damage to the amp/7027s if the trim pot's wiper fails.

How do I go about doing this?

Schematic of amp in question.

[Dave H]

Replacing R38 with a resistor and pot in series would be fail safe.

[Jon Snell]

See https://www.tdpri.com/threads/failsa...g-b25.1141546/
I gave you the solution.