Class A MOSFET amplifier

I always enjoy building audio amp’s particularly Class A topology.

PCB’s of class A MOSFET amp

design:

PCB’s of class A MOSFET amp.

I used two MOSFET’s  (IRFP250N) one is configured as current source and the other one is to amplify the signal, for the input stage I have used JFET 2SK209 provides high input impedance and the

output impedance of the amplifier is 2.6ohm’s

output of the amp is 5watts at 3% THD and each MOSFET dissipates 9.6watts of power efficiency of the amp is 26.04%