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Unfortunately, those early 25V inline Zenith CRT's didn't hold up nearly as well as the older delta gun chromacolor II CRT's. They are not nearly as bad as a '90's-era Zenith tube; but, they could be a lot better than they are.
The 13", 17", and 19" versions of that inline tube held up much better than the 23" and 25" tubes. I was seeing weak 23"/25" versions of that tube in the early '90's. OTOH, I've seen some of those tubes last 25-30 years and still be strong.
Rejuvenation sometimes helps and sometimes it doesn't. Just make sure to use a good rejuvenator, such as a later B&K or Sencore.
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