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If you take each of the tube numbers, make a list of pins for the 7C7, 7A8, 7B7cathode, G1, G2, Plate and then post the dc voltage you read, we can offer some clues.
Based on your initial check of the AF stages, 7C6 and 50L6 are OK
beyond checking voltages, a signal tracer like the EICO 407 can locate RF/IF issues.
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