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I have a 7JP4 with a white line across it like yours not quite as vivid as the one on your tube. This is in the tube because the set the picture was taken on has another tube with no line I just hooked this one up to show the line. I don't understand what it is because if it was from no vertical deflection it would be a dark line as stated in another post. just though I would throw this out because of having another tube doing the same thing.
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