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Even if the tube is under partial vacuum, it could light the filiments have silver getters and still be gassy.. As sure way to test for vacuum integrity is to use a hand held high voltage tesla coil high frequency generator and apply it to the neck of the crt. If the neck gets a purple glow, the crt is gassy. If no purple glow it will have a good vacuum.
If it is not gassy and a crt checker shows good emission, then you have a useable crt.
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Vacuum tubes are used in Wisconsin to help heat your house.
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