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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: Valve Damage ??? posted by Jim McShane on October 24, 2010 at 08:36:50:
Jim- Generally speaking, the internal construction of a vacuum tube varies between tube types, but what "part" of a tube has enough of a "tolerance" or "play" that would allow it to move enough to make contact with another "part" of a tube, in order to make a noise? Not arguing with you, but I was basing my original post on something that I had witnessed first hand. Friend of mine was relocating one of his monoblocks that he had just unplugged, I think it was a Dynaco MKIV. Upon placing it in it's new location, he heard something (tubes cooling down?)and pulled the output tubes and shook them, listening for a rattle. He heard nothing, but less than a minute later(after reinserting the tubes and turning on the amp), one of the output tubes (EL-34) started glowing cherry red so he shut the amp down. This time he let everything cool down a bit before trying the tube , but unfortunately that output tube became unusable, and would not hold bias (kept turning "cherry red"). regards, Paul
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Follow Ups
- RE: Valve Damage ??? - wpod 10/27/1008:43:58 10/27/10 (1)
- RE: Valve Damage ??? - Jim McShane 10:48:29 10/27/10 (0)
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