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I had a late model 19" Chromacolor II with the single tuning knob when I was a kid that would drift with warm up. I never did completely solve the problem. A different tuner helped, but it didn't cure it. I think the problem was in the tuner because when I ran it with the tuner open (ready to hit it with freeze spray) it didn't drift. Are there any electolytics in the tuner?
I just found a compromise fine tuning adjustment that allowed it to stay locked on to the cable box output.
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