Thread: 21ax gassy or bad 3a3?
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Old 12-31-2015, 07:21 PM
Eric H's Avatar
Eric H Eric H is offline
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More likely the 3A3 went bad, it shouldn't glow blue. It might check okay because your tester isn't putting 20kv on it.

A small amount of blue glow between the elements of a tube can be normal, if the whole neck glowed purple than I'd worry.
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