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Andy:
I just finished an IF alignment on a CTC-5. I used a B&K 415 sweep/marker generator. I too had a scope trace that was just one peak and it turned out that the alignment was that far off. It seems strange that your set would be that far off though as most are not. It may sound obvious but did you try subbing the tuner tubes? Cable signals tend to overload the video and should not result in a snowy picture. Before doing any adjustment on the IFs I would try to focus on the tuner, perhaps sub it if you have a tuner subber.
Steve
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