This is for Georgehifi especially but others can chime in.

I think power cords are useful in that they do supply current from the wall to the gear (and my toaster, etc.), and any positive comments about gear from salesmen who carry the gear they comment about chews the fun out of the gum of any forum discussion.

I assume we are talking about MOSFET transistors on the output stage? Nothing new. Ideal for delivering extremely high current. Extremely high breakdown voltage. Low switching distortion and fail in a nice way (open circuit) which prevents too much collateral damage. Hafler started using these in the 80’s. 

I assume we are talking about MOSFET transistors on the output stage? Nothing new. Ideal for delivering extremely high current.

Bi-Polars (BJT's) are even better for giving current into low impedance's.

Cheers George

pass labs x250.8 would be a great match.

@audiotroy

Nope... Not fabbing any dies here, but you kinda learn some of this stuff actually building the circuits and trouble shooting them. I’m certain you’ve never soldered a transistor to a board in your whole life, nor looked at a transistor spec sheet. You speak from pure ignorance and an abject lack of experience. Anybody who’s actually built an amp knows that ramming unnecessarily high voltage through an output stage is plain stupid. It does nothing but limit the bias current, shrink the envelope, and increase distortion.

Take note of how I'm not speculating here. I know what I'm talking about because I've been fiddling with this issue on my modified F5 running hot rails. 

@georgehifi
Why do you think BJT’s are good for passing high current? They’re the most prone of all devices to thermal runaway.