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If you have an oscilloscope you can check the H output grid directly, and the yoke by capacitance coupling (wrap a new lead a couple turns around a yoke wire), the B+ and the video. Checking the video tells you if it could be getting in the antenna, checking the B+ tells you if it's conducting through the B+. Also beware poor grounds on circuit boards if this set uses them...Poor grounding can cause all kinds of nonsense.
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