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Regarding the buzz, there are two sound coils, the !F and the detector ('quadrature') coil. They're both located right close to the 12BF11. The detector is the one you want to try tweaking first. it's the one located more 'inboard', while the IF is the one out near the corner of the board.
But get the best color picture tuned in first. Then peak the detector for least buzz, and then adjust the IF a bit for best sound. Sometimes you gotta juggle the two a bit.
Sometimes you can minimize buzz with the AGC adjustment too.
Last edited by old_coot88; 12-22-2019 at 09:57 PM.
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