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Dont throw that 21AX dud away. The leak can be located and repaired. Someone has already repaired the leaks on a 21AX. There are a couple very talented people working on these issues behind the scenes. Some day your tube may be valuable as a rebuild-able dud.
Who was the re-builder of the NOS tube you got? As I recall, Olson Radio used to sell metal tubes that had the metal part painted red.
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Vacuum tubes are used in Wisconsin to help heat your house.
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