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They can't replace the phosphor, or shadow mask in a color CRT. There's no way to get to those parts. If a color CRT has screen burn, or a damaged shadow mask, it's no rebuilable.
My favorite CRTs are definitley Zeniths from the 60's up to the early 80's. They became hit or miss until 1993 when they went to all miss. Those RCA/Thomson CRTs aren't the best looking, but they do seem to last a long time. A lot of them have poor focus, but otherwise look good. I don't remember ever seeing a weak one, but I have seen a lot with shorts, or open heaters.
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