Art,
I had similar condition with used Centaur amp, arcing in plate capacitor.
It took a while to spot the cause, but eventually discovered a bad spot on a
capacitor plate where I think a bit of dust accumulated and created a path for
the arc. This led to a bump of melted aluminum on the edge of the plate
which contacted the plate next to it when tuning the amp. I removed the
capacitor (luckily easy to do on the Centaur) and using an emory board,
carefully
filed the bump down flat and reinstalled. No further problems. This may not
be your case but will give you one avenue to explore. Good luck.
Mike K4KJC
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