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Anybody could walk in to a store and buy a brightener. I've seen them on good tubes more than once...Most interesting case was a 1968 Zenith color. The set was low hour and the CRT was STRONG, but the 25KV from the flyback was more like 11KV...It worked surprisingly OK like that...The root cause was the original H output being weak... possibly the HV rect too.
It's not uncommon to see sets stripped of tubes. Home repair attempts usually involved bagging them and bringing them to a drugstore tube tester, if they were fine they might not go back in since the problem isn't a bad tube and that's too much work....
Also repair shops when they condemn a set will offen strip the tubes, then knobs and similar common trim, then toss the cabinet and rob bits off the cabinet....In some cases those steps didn't all happen at once.
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