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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: What causes a tube to fade to black? posted by AudioDwebe on May 7, 2020 at 09:09:41:
I would agree with Story's assessment.
The tube is faulty. A pass on a tube tester probably wouldn't have revealed the problem. Especially if you need 10min of real life operation to reproduce the issue.
It sounds like a drift into a cut-off condition, like the negative bias on the grid is creeping down into stronger negative supply, until it cuts any electron flow from the cathode. Or, the cathode could be poisoned or worn out in some way that eventually restrains the flow of electrons from ground (in which case, the existing negative bias shuts off the tube).
Shame - I hear those Pope's are really nice sounding :(
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Follow Ups
- RE: What causes a tube to fade to black? - TubeAcolyte 08:48:39 05/08/20 (0)
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