I came across an old tread in the archive about the encapsulated amps made by Les Sage in the UK around 1990. They were supposed to be Class A in terms of Sliding bias (non-switching) rather than the pointless but easy 50% bias most people use. Anyway, I unpotted one of his SUPERMOS amps and here is the circuit. It's not very impressive. Les is no longer alive so he can't answer for his claims...pity. See attached pic. regards Andy.