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Having dealt with many, many rebuilt (re-gunned actually) CRTs back in the day, the biggest problem was contamination resulting in internal arcing. This was true of premium rebuilds and particularly true of 'garage' rebuilds from the guy up the street. I suspect many rebuilds had inadequate vacuum, as they tended to lose emission inordinately fast.
A genuine rebuild would entail re-phosphering as well as re-gunning. I don't recall ever encountering a 'genuine'.
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