I am building an amp. Here is shematic.
It's prety easy amp ,with distortion about 0.08 %. It is part of system which will amp my woofers. Preamp is already built and now it's time for amplifier.
Hi Kpero,
Q4 & Q6 need current capacity to drive the output fets at high frequency. You may need to add a pair of drivers (fet or bjt) to ensure front end can work.
Hitachi type L-mos will work with your bias circuit, but they require the drain and source layout be swapped, they are harder to find, and are more expensive.