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Could be your sound IF is off frequency... I'd be tempted to dial in perfect picture and try to tweak the sound IF for clarity.
Another option is to comb out all the bad sound and video IF resistors...On my CT-100, 21CT55, and both of my CTC-4s the sound, color and monochrome all didn't line up with each other and replacing all the off tolerance resistors brought them all back to normal performance...YMMV
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