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pretty sure Bob Anderson ran into sound issues like this, turned out to be the audio IF suffering from silver mica migration on the integral caps.
the way to know would be to see how well it responds to audio IF alignment, if the slugs do not tune up sharply then there is your prob. I am no suggesting a shot gun approach as I prefer to diagnose and correct, but if you do have issues in the audio alignment, dont forget those caps.
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