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The 21AXP22A arc fix involved a high resistance internal connection to the HV (bell), so that an internal arc woul be less likely to do any damage, and eliminated the need for an external resistor in series with the ultor connection. Probably unrelated to you filament problem.
Scotty at Hawkeye is (I think) willing to attempt a 21AXP22 rebuild, but I suspect it would not be cheap. If you hunt around in the collecting circles, you will likely find one.
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John Folsom
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