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Use a scope or signal tracer to check pin 7 of the 12AV6 tube. Good audio? If ok then check pin 2 of the 50C5. If no audio or very low audio there the network may be bad. Depending on the schematic for the network you may be able to disconnect pin 5 and 6 and put a coupling cap between pin 7 of the 12AV6 and pin 2 of the 50C5.
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