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That means that air has leaked in, so beware that the tube may arc when it sees high voltage. I would recommend not planning on using that tube, but on the other hand, it may have such a small leak, that it has taken 50+ years to leak to this point, and if it's going to take another 25 years before it leaks enough to arc, then obviously you're fine using it. If it's been in a damp environment, then likely the wires from the base have corroded into the glass, and have allowed a leak.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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01-02-2012, 12:41 PM
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