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Hi All ... Thanks for the input! I was also thinking that perhaps the HV rectifier was at fault. Of course, it tests OK on a tube tester, but as you say, that does not tell the whole story.
As it turns out, however, yesterday (the day after I posted my message) I ran the TV for about 6 hours, and it did not show the same symptom. A slight amount of blooming with the brightness or contrast, but only what I would expect. I think I will need to wait until the problem reappears before I can do any substituting and/or testing. Do you sometimes find that these sorts of problems are self-healing, i.e. go away after the sest is "burned in" a bit?
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