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<<<It seemed like I read somewhere that the really old B&W tubes suffered worse phosphor degredation - until they switched to an aluminized screen or something like that.>>
Very early tubes didn't trap the ions so would get an ion burn spot eventually, later they added angled guns + ion trap magnets to suck up the ions, then came phosphors coated with very thin film of aluminum which stopped the ions and eliminated need for traps.
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