In the same manner that, often for audio power output situations, cheap 100V, 15amp TIP3055/TIP2955 with maybe a bit of change of mounting is a perfectly servicable replacement for rare/expensive 2SA... / 2SC... bipolar pairs. Is there anything similarly for the same/similar wide plastic package TO3P,TOP3,SOT199,TOP66 >100Volt , 15amp power MOSFET n and p type pairings for audio use ?
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on