This is a class A 10w amp FET version, I used the PSPICE model for a 2SK1058 but the output was lower than expected at around 4 w, If you use the standard EC MOSFET parameters, the output can be considerably greater, but I'm not sure such devices exist in real life.
I shall continue to work on it to increase output, the BJT version has higher output but I prefer the sound and robustness of a FET
Specs: 26 - 196000Hz (-1dB)
4W peak output with CD level Input
Achieves about 3x gain over input
Single 50v Rail, low component count
Much greater output can be achieved by altering bias current pot and input resistance, but the heat from the output devices would need larger heatsinks.
