Roger:
Micro-cap sim doesn't look that good but on the proto board it works well.
Put two 5.1V zeners in series.
Used two resistors for the dropper to get some negative feedback.
Seems to regulate well. Set to 900V and then crank the Vcc to 1150V, and the regulation increases about 30V.
I think I got my fun out of this circuit.
May be I will try the BJT version posted.
Again thanks for all the suggestions.
P
