I wanted to build a simple low resistor value Schade feedback Zen amp with a Cree SiC mosfet.
I measured one randomly picked Cree C3M0065090D SiC and one Ixys IXTP32P05T and found that I could easily build something similar to the circuit above. I would use an Ixys IXTP32P05T as M2 and the Cree C3M0065090D as M1.
With some juggling of the values of R1, R2 and R3 I can adjust the amp to a stable working point without altering the feedback ratio in the Schade feedback. With a constant current source instead of R1 (second simulation above) where the 4,7 volt voltage-source should be replaced by a potentiometer, a 5,6 volt zener diode and a resistor to ground to make a adjustable constant current source, the amp will be easily adjustable within a reasonable variation of devices and currents through M1.
I would love to use transformers like Nelson Pass in his 50 watt Zen monster from BAF 2015, but they are expensive compared to a p-channel fet and a few resistors.
The dissimilar sex mosfets will compensate thermally for each other if bolted to the same heatsink.
As an added bonus you get a DC coupled input. No need for large value film capacitors, low input resistance etc.. It would be easy to drive this amp with a SRPP tube preamp or similar, as the input resistance is whatever you use as R6.
Just an idea to play with if you are interested in a simple way of implementing Schade feedback.