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I had several good, used CRTs stored in an outdoor shed for about 5-7 years. The temperature swing would go from about zero F to about 100 degrees F. I was very sad to find that two had gone to air. Bugger! The gent that I had gotten them from ran a TV shop years ago and he had stored them indoors. Thankfully, the 21CYP22 that tested NOS was not bad.
I now am a firm believer that these CRTs and for that matter, NOS vacuum tubes should be in a controlled environment.
Sorry that your CRT "Went South".
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