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I eliminated the power supply (used an isolator) and antenna as culprits, but I think it was a combination of things - I had the color turned up too high, I've switched to a straight connection to the antenna terminals instead of a vhf/uhf splitter box, tweaked the horizontal hold a little better (it can start to mess with colors on this set if you get sloppy with it), and dialed in the red purity. Plain red screen just plain sucked but had looked good enough on programming and on blue so I hadn't really touched it. Now the hum is basically not noticeable and picture is a ton better to boot. It has shields on the ifs and the burst so I think I'm ok on those too. Thanks!
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