Tube vacuum compromised? Tiny crack on glass
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kevchy

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I noticed a small tiny crack in my 2A3 tube while it was running in my audio system. It still works, but is the tube now running on borrowed time?
 
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megabigeye

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I'm not a tube expert by any means, but my guess is that as the tube heats up, the glass will expand and the crack will spread.
 
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tomb

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