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I only have one 21AXP22 (out of a CTC-4) and it is gassy (no catastrophic failure)...Granted the set was in bad shape and I have no way of knowing the storage conditions it experienced, beyond that it was freezing in Nick's garage when I obtained it.
IIRC the guy that was trying to make an all glass 15GP22 did a test rebuild on a 21AXP22 and sealed the leaks, so it may be feasible.
The advantage of 21" sets over 15GP is that you can easily adapt them to more stable all glass CRT types (as I did with my CTC-4)......
Granted those 'all glass' tubes are not bulletproof either....I have two gassy 21FBP22 CRTs in my basement, and BOTH of them have copper metal evacuation nipples....Clearly metal-glass seals are the bane of holding vacuum reliably for more than 30 years.
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