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If it oscillates with the 6A7, it oscillates. May have been a later version of the set. Set your signal generator to 455 kc with internal mod and lay its output cable near the first IF transformer wiring. Assuming 455 or 456 is the correct IF for this set, should hear the tone in the speaker. Maybe somebody fiddled with the IF trimmers.
If the oscillator works, and the spread is from 1000 to 1455 between the two radios, then you know the IF should be 455. With that determined and working, what's keeping the oscillator signal from beating with the incoming BC signals to produce IF? Hmm...
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