I got this in, and someone else had attempted to repair it, the other guy told me he had replaced the finals several times but they kept failing on power-up. Looking at the output stage I think one of the FET's may be incorrect. Could someone check the schematic and see if this unit is supposed to have 2 IRFP140's for finals (both outputs N-channel?!)? I believe this should have a complimentary output pair, IRFP140/IRFP9140, N and P channel, but as I did not see it before parts were changed I'm not sure.
Jammy