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I mention the tuner because my CTC-11 has a problem with intermittent sound coming from the tuner. The picture will be fine but you keep having to get up and jiggle the knob to hold audio. It hasn't quite bothered me enough to pull the set out and fix it.
I'd do a lot of prodding on the audio board, jiggling tubes, pushing down on the board itself with a screwdriver or something to see if a small amount of flex will do anything. I think it must be ahead of the audio section, though, in the front end. Look at the schematic and see if there are any common points between the horiz and the IF/audio that could cause trouble. It's been a few years since I've been that deep into mine. Have you played with the AGC a lot on this? Not the one on the back, but the one inside the contrast shaft on the front (if I remember right). Mine has always been finicky with contrast/AGC/brighteness/horiz hold, usually requiring a lot of tweaking as the set warms up. I did the contrast mod as well and it really does help.
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Bryan
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