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The CTC-115 is a solid chassis from what I can tell. I had a 19" color set with rotary tuner with the -115 and it worked as found. Yes, all the usual cleaning of the controls and tuner are essential on mostly any set this old.
I had to pass up a CTC-89 from the late seventies this week. It was as clean as can be, but smoked and blew the fuse at power-up. Not exactly worth 20 bucks. A few years back I had a CTC-89 from 1977 from the curb and the green color channel was as dead as could be. It worked fine otherwise. I thought the video output board had intermittents or a bad driver transistor, after scoping the chroma demod stage, but it turned out the green had basically no emission as tested.
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