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Don't hold your breath on 15G rebuilding. Even of it does become possible, I doubt the yield of usable tubes is going to be terribly high. Subjecting an under vacuum tube to the rebuilding process would be an enormous risk. That said, buying a "good" 15G is a massive risk anyway...
Enjoy that 15G while it's still possible to do so. If the arcing is a gas issue, and I strongly suspect it is, you're saving cathode material in order to light up a purple neck. If you run the S.O.B into the ground, at least you'll have enjoyed the set more. Either way, the outcome is the same: you sit with a dark set and await the rather unlikely rebuild process.
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