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I don't think the 32" and 35" tubes were actually made by Zenith and that could be why they hold up so well. A friend had an early 31" Zenith digital system 3 (overpriced piece of junk) that had a Zenith-branded CRT in it; but, I never looked at it close enough to see if Zenith actually built the tube. Sometime in the mid '90's, it started going weak and I hit it with the rejuvenator. It lasted a few months and started going back down again.
Concerning Sony tubes, the earlier ones from the '70's and early '80's often won't rejuvenate at all and if they do, they won't stay up long. A few years ago, someone gave me a cosmetically mint condition 19" Sony from the early '80's (the varactor tuned model with the vertical row of buttons and a plastic woodgrain cabinet). The picture was green, with zero red and zero blue. On the tester, the green tested strong; but, the other two guns were totally dead and would not rejuvenate. I ended up junking the set. I've rejuvenated some of the later Sony tubes that held up for a little while; but, not as long as other tubes that I've hit.
Concerning the later small neck color CRT's, the local hospital had 20" Magnavox sets in all the rooms and these used that type of CRT. The local parts house always kept that CRT in stock because they were constantly replacing CRT's in those sets. I think some of those sets are still in service; but, the last I heard, they are no longer repairing them. When they fail, they are being replaced with flatscreens.
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