Quote:
Originally Posted by radiotvnut
I think that chassis uses several white HV caps connected from the collector of the horizontal output transistor to ground. It would probably be a good idea to replace these with modern capacitors of the same rating.
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YES!!! That chassis has (5) safety caps, Zenith part 22-5001. I think 3 of them are on the phenolic board on the flyback, and the others are below the chassis. If yours has white ceramic ones, they were recalled in the late 70s by Zenith and you must replace them to prevent the high voltage from escalating and possibly breaking the glass neck of the picture tube. In addition to CRT drive voltage problems (as discussed in some of the other answers) blooming is a symptom of too much high voltage, or poor regulation.
Charles