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There are massive amounts of pressure on a 24" tube, maybe some small defect finally let go after nearly 60 years. The only other point of stress I could imagine would be the band, it wouldn't be hard to over tighten I think but it seems odd that it would be okay this long then let go. Perhaps the heat expanded the CRT and increased the pressure.
At least the safety glass seems to have done it's job for the most part, seems to have contained most of the glass?
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