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Seems like I remember reading something about a similar problem in a black and white set - a vertical line running down the left part of the screen. Apparently, it was caused by unwanted oscillation from the horizontal output tube, and that the easy cure for it is to simply swap tubes until you find one that doesn't oscillate in that circuit. I don't know if this interference is the same as the one described in the thing I read, but I do know that the symptom in this case was a vertical line in the left side of the picture. If you have another set with the same HOT, or some spare tubes, try swapping them in and see what happens. Couldn't hurt.
-Ian
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