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lol.
But yeah, I'd hope there was some sort of impurity which has 'flashed' off, meaning that it's a one-off thing.
If the tube elements' supports have shifted some due to thermal cycling or manufacture defect, then the problem can come back to the point where the tube will be ruined.
I've had nothing but good luck with Japanese CRTs from the '79-'82 timeframe.
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