"Simon Burley" wrote in message
...
Hi,
I have a need for a low output impedance class AB output stage. The supply
is single rail +500v. The problem is finding readily available components
to build the output stage. I think this is safely FET territory but
finding a P-channel FET is somewhat problematic. Does anyone have
suggestions?

http://www.fairchildsemi.com/ds/FQ/FQP1P50.pdf