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If you can't find this out, you might be able to disassemble the transformer and get at the mica wafer. Don't know about their TV sets, but in Zenith radios of this vintage the wafer was under a phenolic wafer (holds the terminals) and fastened by a nut on a screw. Once I removed it, I took a sharp knife and scribed the areas between the silver areas. That would break the silver migration paths. I then put it back together and it worked better.
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