Tube failure mode: gassy?
flipper wrote:
I've got a 6EM7 that does the same thing and it's visual appearance is
perfect as well so I doubt it's your circuit.
Come to think of it I had some nearly-new (back when I was a kid!)
6146B's go into grid-and-plate-current-runaway-at-idle like this 807
too.
Tim.
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