Ralph, I have cleaned the contacts with mineral spirits and put a light coating of NO-OX-ID on them pushed the boards on and off a few times to transfer some on the NO-OX- ID to them - No joy.

I have a can of Deoxit. I can try it.

Thank you for the suggestion.

By the way - I have been finding filter pots on used Flesher TU-300s glued down. It will not chip off with a greenie or even a razor blade. No good! Active filters drift and must be re-tuned every year or two. I found that mineral spirits applied with a Q-tip will soften the red glue just enough to break it loose without damaging the pot. And the filters did need re-tuned!

Tom   N3CRK