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Sam's technical publishing's website should have it, though is not necessarily the cheapest source. The hum could be video related rather than bad lytics.......Zenith used some darned good lytics in the 50's-70's. If the lytics run cool after the set has been on an hour or so, and putting a new cap in parallel with the existing lytics yields no improvement then I'd leave the lytics alone. Instead I'd focus on the paper, molded plastic, and tubular ceramic caps which are not as good at this point in their lives.
Zenith sets tend to out live most other brands......I've got older Zeniths that still work on original caps so if you had a watchable picture on the screen I would not be the least bit surprised.
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