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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: Penta Labs KT88 posted by GregS on March 26, 2006 at 13:37:25:
I had a tube with a 1/4" envelope crack that didn't compromise vacuum...yet. I returned it.
Another time a crack developed that turned everything white within the glass envelope; found it after its amp channel had no output, having remembered hearing a dull "ping" when last turning the amp off. As an SE amp output tube it simply didn't conduct, and the amp was OK.
Can you inspect yours under magnification? Do cracks usually create surface protrusion?
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Follow Ups
- Check under a loupe? - mpathus 23:46:02 03/26/06 (0)
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