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Yes, I would consider that an early Zenith inline tube. There were a few later CCII's that used a similar tube. If that tube has made it 28 years and is still good, it will probably remain good. I've seen way more 23V and 25V inline tubes with this type gun that were weak/dead than 19V and smaller tubes. I think I've only seen maybe a half dozen 19V tubes that were weak; and, only two of them were unwatchable. I'm not even going to try and remember how many of the 23V/25V tubes that I've found that were weak, even back in the early '90's when these sets were only 8-10 years old.
I've also seen a similar CRT in Magnavox and Sylvania sets. Again, the 19V's held up much better than the larger sizes.
I think those CRT's had 2 focus voltages plus the HV. Maybe someone will chime in with more detailed info. I do know these tubes produced a better picture than the regular in-line gun tube that Zenith started using in around '83 and continued to use up until they discontinued CRT production.
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