Check under a loupe?

Tubes Asylum

Questions about tubes and gear that glows. FAQ

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 Full Thread

Topic - Sigh..... - GregS 12:49:18 03/26/06 (5)

Re: Sigh..... - GregS 08:28:09 03/31/06 (0)

I don't believe it is a crack. - sser2 19:21:58 03/26/06 (1)

Re: I don't believe it is a crack. - GregS 21:32:45 03/26/06 (0)

Penta Labs KT88 - GregS 13:37:25 03/26/06 (1)

Check under a loupe? - mpathus 23:46:02 03/26/06 (0)

Follow Ups

Check under a loupe? - mpathus 23:46:02 03/26/06 (0)

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