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Thanks for the explanation! I actually just changed the zenith HV rectifier to a NOS GE, which may be what brought on the problem. I bought a set of tubes for the set, and changed all of them... thought it couldn't hurt after nearly 40 years, even though about half of them tested well into the green on my EICO 667. I'll put the old one back in tomorrow. I hope to keep the TV going until the picture tube becomes too weak to
be useful... at that point I'll have to search for a replacement tube, or a lower hour TV to get one from, which looks like quite a challenge in this day and age. I always assumed I could just have it rebuilt, when needed, so never paid much attention to securing a replacement.
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