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BTW are you aware of the phenomenon of CRTs being asleep? In a nutshell if a good tube is not used for a few years gas inside the tube gathers on the cathode and forms a coating which blocks emission. The coating can be boiled off if you run the tube heaters at 1.4X their rated voltage for about 10 minutes give or take. Any weak tube that I don't know the full history of gets the 'cooking' treatment before I write it off...And most bounce back well.
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