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Post Thomson RCA tubes have been surprisingly good. They do have a rather high defect rate, but if you get a good one they seem to go on forever. I've never seen one that was too weak to use.
The bad Zenith CRTs started in late 1993. After that 3 years was about all you could expect out of them. Of course, a bedroom TV that's only on an hour a day could still look fine.
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