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Another thing you can try is (IIRC you have a scope) to inject signal at one point and follow it down stream with a scope.
Part of me wonders if the IF tubes are biased right...I once had a portacolor with a tin whisker shorted AGC pot where the IF grids seemed reasonable but were actually biased to cutoff. It took manually biasing the AGC to get the set to poorly pass signal, then I shifted focus to the AGC and it started working good after I got the AGC sorted.
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