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Have the paper caps been replaced...could be an intermittent in a cap in the audio circuit. Sets that use 6X5, 6V6 are not series wired, at least I never saw one, the tube filaments are a parallel circuit.
Intermittants in tubes themselves are very rare...you need to replace the old caps to rule that out as a problem, then try the contact cleaner in the pots, switches, and tube sockets.
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