ok this amp is back together and sounding great,
N channel IRFP240 fets matched up to within 0.1 milli-volts across the 0.47 ohm resistors right out of the tube,
P channel IRFP9240's were 5 mv apart, which is still good but no as exact as the N channel, this has been reported by other people matching these fets,
we replaced the 2N5415 and 3440 transistors with NOS Motorola cans off evilbay,
rail voltage were +/- 67 volts instead of 60, so we used taps on the toroid xfmr and managed to drop it back down to 60, this seems to be a common problem with offshore toroid pwr transformers,
since the prw xfmr is no longer using two primaries in parallel, we have to make sure we do not cook the winding by using a single pri and part of another pri in series,
so we say 360 watts with +/- 60 v-dc rails needs 360/120v-dc=3 amps,
use a 1:1 ratio and we see we need about 3 amps pri, should not be a problem,
so we save the fets 67-60 = 7 volts each rail = 14 volts at 3 amps = 42 watts,
this is the excess wattage generated by the out of spec pwr transformer,
and the zener clamps stay the same, so we limit the total power by 40 watts even if the guy cranks it up to compensate for lower rails,
so we hope the decreased power will add life to the fets and keep the amp from popping again during this lifetime,