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The only thing I can immediately suggest for anyone on these, and all 7 & 8 inch electrostatic sets, is do NOT use ceramic disc caps for the high voltage and sweep HV section. It's tempting to use .001 and .0047 @ 6kv discs, as they're easier and cheaper to get, but they have a radical warmup change in value. Spend the money and get good tubular mylars, and that will resolve the height, width, centering, brightness, and blooming problems during warmup. I don't think it would do much to stabilize the oscillators (H & V) specifically, but by stabilizing the high voltage and sweep, there will by default be a stabilizing of the B+ by not loading and unloading the line, and thus some stabilizing of the whole TV.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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