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Something I never got around to experimenting with was what would the FDA24N40F swapped FET (Palomar FET 450HD in this case) amplifier do with 24V or even 50V supply voltage?  The FDA24N40F is a 400V mosfet.   Someone try it and share.  The parts are cheap, who cares if they blow up, $10 or less for a whole new set of 4.   I don't have that amplifier anymore, sold it many years ago.