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Regarding the proposed tube complement for a 9kV RF supply, a pre-war tube complement such as 6N7 (or 6SN7), 6L6G, and 8016 (early Industrial precursor of 1B3) could be used. I believe American engineers may have developed RF oscillator supplies pre-war and either developed the flyback method as part of radar development during the war, or learned the technique from others.
I would need to do some research to determine whether a 10" round electrostatic tube with post-deflection acceleration was part of any manufacturer's product line.
Some years ago, I had a chance to pick up a Dumont oscilloscope complete with mobile rack. Although offered for free, I was unable to get anyone to transport the thing 40 miles to my home (I was about 19 at the time, no car, living with parents). That was an interesting scope, perhaps a 10 MHz bandwidth. Its claim to fame, however, was its MASSIVE rectangular screen of about 17" diagonal. Also it was a two-piece device. The scope itself mounted in the sloped top of the rack and its power supply was a separate unit occupying the bottom few rack spaces underneath. About the same time, I did manage to pick up an old USN surplus Dumont scope (date printed inside was 7/1947 IIRC) with an interesting "heads-up" display that was covered by a hinged lid when not in use. That one, I later sold to a collector to raise enough for a down-payment on an engagement ring. This was perhaps ten years prior to my meeting Jan. Incidentally, Jan was the first of the many ladies I had met to ever understand my vintage electronics fascination enough to actually learn to share in it.
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