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I keep the weak ones that are under vacuum. If there ever is rebuilding at the ETF having a tube that is under vacuum and you know has no dead phosphor and a good shadow mask (I've seen ones that got knocked loose) is the only safe dud to gamble rebuild money on. Also if you ever are given a necked console and need to sell it a weak tube that makes a picture is a heck of a lot better for making it sell.
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