The 22" tube is a rare one... Used in a few late 60s table model sets, and also in the RCA 22" consolettes and metal table models with a CTC-31. The other tube is Zenith's biggest blunder ever; the A63AAX42X. Those seem to have left the factory with a built-in short, which is designed to explode a few transistors in the TV.
. When I'd get one of those 25" sets for repair in the 90s, I'd put an isolation transformer on the CRT immediately, even if the set came in for a broken antenna terminal.
Charles