Planning ahead but stumped by a circuit.

[AdrianPH]

If you look at the pdf I put in post #7 it has the DC voltages marked, these are what I have. I was expecting a larger output swing, even if I tie one end of the output to 250 Volts the other end voltage swing makes it down to 150 Volts and up to 350 volts and not as I was expecting nearer to 400 - 500 Volts pk to pk.

Adrian