Hi Ante & Audioguru, Thanks for the reply :). I think I'll scale down the specs to 1000V, 1A. This is the power supply for a RF amplifier as Ante rightly guessed. I require it for RF plasma research. Crockroft-Walton circuit is a standard circuit to generate HV DC ( >300kV ). I know that it can generate this voltage in 2 or 3 stages, but I want to be sure of the current. If this do not work out, then I'll look at the convertor-invertor-convertor scheme. Right now I don't have a jpg/gif of the circuit. I'll post it as soon as I can get one. I have limited experience of HV, and this is the first time I am doing this. Yeah, and I'm a little wary of the high power involved ! :o