I have built a prototype HV power supply and now have a fully functioning XY monitor. The only thing I am using that is not built from scratch is the neck pcb from a TV. Here it is! Asteroids on my 9" color xy test monitor. The China power supply only outputs 98V max, it would have been better to have around 125V for b+, but for a test monitor it works fine. If anyone builds this be warned you are dealing with high voltages that can be lethal. I am not a high voltage design expert, if you see a way to improve this please test it ouT and let me know. I will post the schematics shortly.
I also have 2 new complete assembled tested working deflections pcb's for sale if anyone is interested. I have left mine running for days and days they are bulletproof. Heatsink is not included.