Hi this the the second part of the audio amplifier the Greenamp v1.2 schematic this is the power audio board this design can use BJT or mosfets power semiconductors just fallow the schematic and you will figure it out no difficult to build the photo you see is actually my build, the supply voltage is from 40V DC up to 85V DC positive and negative rails, the bias adjustment is simple to do just read voltage drop on one of the emitter resistors 0.22 ohm to 26mV DC. There is a website that has more information about this design many people build this audio amplifier. The size of the PCB is 254 mm x 80 mm. I recommended to try BJT if you are not comfortable matching V-mosfets I will leave the simulation of this amp design in mosfet and BJT power audio transistors the maximum power that can deliver this design depends on the power supply you are gonna use I recomended a 800 to 950VA toroidal transformer but this design can work just fine with a 600VA toroidal transformer according to simulation can provide close to 600 watts @4 ohms but with the experience I have I will say that can provide clean 350W @4 ohms with really low THD there is a lot of good information about this deisgn here on this link from diyaudio.com

the designer is Mr. Ostripper

https://www.diyaudio.com/forums/solid-state/248105-slewmaster-cfa-vs-vfa-rumble.html