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I've also had good luck with rejuvenating the older RCA delta gun CRT's, as long as your rejuvenator is no an ancient "atomic blast" model.
In the early days of rectangular color CRT's, the tubes were numbered like 25XP22, 25AP22, etc. These are technically 25" CRT's; but, once installed in the set, there will only be a 23" viewable picture. Despite the fact that the picture was only 23" viewable, many of these sets were advertised as being 25".
After a few years, the FTC cracked down and said the advertised screen size had to equal to the actual viewable picture size. So, if a set only had a 23" viewable picture; then, it had to be advertised as a 23" set.
Sometime around 1970-'71, TV's with 25" viewable pictures came out.
Later, CRT numbering changed to having a "V" in the type number, such as 23VxxP22 (23" viewable picture), 25VxxP22 (25" viewable picture), 19VxxP22 (19" viewable picture).
As far as tube substitution, a later 23V series delta gun CRT will sub for the older tubes like 25AP22, 25XP22, etc. However, a 25V series tube will NOT substitute for an older 25A, 25X, or similar CRT.
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