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There used to be a strange malady that would turn up in these sets. And it was not the set's fault. The Zener on the 24V (or was it 16V?) buss would be shorted.
The set originally had come in for hum bars. Some ham fisted techie had been jumping the filters with a test cap, but failed to discharge the test cap before going to the next filter.
The low voltage filter is in the same can with the B+ ones. The techie would jump the test cap, charged up to full B+ voltage, onto the low voltage filter, instantly blowing the Zener.
Good thing the Zener shorted, or the overvoltage surge woulda probly blown a bunch of transistors.
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