Pictures of the inside, and the general area where it's arcing would help. Whenever I get a new set, standard practice for me is to check every tube, and clean every tube socket, control pot and the tuner with a spritzing of Deoxit. Also, as you may know, these sets suffer from cold solder joints. It's imperative to reflow all the ground stakes and scrutinize all the other joints on the board for cracks.
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"If you wish to make an apple pie from scratch, you must first invent the universe." -Carl Sagan
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