I personally have had situations where my tube tester has failed me. I've had tubes test well and than blow a fuse in my amplifier and I would have to locate the bad tube by trial and error and replace it. I never had your situation, but just guessing, there is a possibility that once the tube filament becomes heated, the tube is leaking emissions. I am very curious about this anomaly, I hope someone out there can provide a definitive answer.
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