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The buzz could possibly be the 'nature of the beast', owing to the highly unusual sound take-off scheme. Both sound and sync are combined in a single triode section of the 11BT11. The actual takeoff point is the plate of the 3rd IF stage, rather than right after the video detector as in conventional designs. It looks like GE's way of going el cheapo and still make it 'work'. It may indeed have worked passably in the days before digital players, digital converter boxes etc.
You might still try subbing the 11BT11 just for the heck of it.
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