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I'm just going on speculation here, never having worked on a electrostatic type set myself yet, but assuming that bias power and video is clean, winch really can't be done with the naked eye from a troubleshooting standpoint, but if so, you would have to go over every inch of the sync separator circuit (or as it's called, clipper here.) from where it's taken off the video amp circuit to where it's processed, and fed to the horizontal / vertical OSCs, making sure that all in between is correct and in tolerance.
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