Tube DIY Asylum

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bias trim pot - sub?

Posted by bdgregory on May 6, 2009 at 13:47:36:

Hi, my simple question is - is it possible not all 25K linear trim pots are alike? In my case could the sub I installed be the source of my bias problems? Here's the situation:

I'm having trouble with biasing a Fender amp. I purchased the amp as is and don't know if it biased ok before the trim pot was damaged (it's mounted on the back panel and was banged, breaking the pc board mount off).

It's listed as a 25K linear pot. I couldn't find the exact part so I bought a standard 25K linear pot (ie tone control pot) and installed it. The only apparent difference was the shaft and existence of a brace on the sub part.

I have since found the correct replacement part, but am trying to determine if I should buy and install that before I rip out the main board and try to diagnose/repair the issue.

Advice? AS usual, thanks in advance!