I need to be around 60 - 100 Khz. There will be no active feeback loop, no regulation just brute force. Primary impedance will be so low that any spikes in the load will be immediately reflected to the source. It will run at resonance.

Square or sine, or something within reason at a constant frequency, able to deliver say 200 V P-P at eight amps or so.

Actually 75 Khz would probably be optimum.

J