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I would imagine the focus voltage is pulsed DC at 15Khz, and can possibly be able
to produce bars like that if carbon tracked over to a common K, or G, point.
I had a tv once with Heater to Cathode short or leakage, don't remember how
shorted it was, But it produced white hum bars that floated upward through the picture
similar, but opposite to the black bars you might see in a bad power supply filter cap.
That one I found using the resistance measurement table in the Sams.
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