This is for Georgehifi especially but others can chime in.

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.

Why do you think BJT’s are good for passing high current?

If you don’t know this, then well???
Look at any amp "tested" that can almost double it’s wattage for each halving of impedance right down to 2 or even 1ohm and 99.99% of the time it will be an amp that has Bi-Polar (BJT) outputs.
Go back to giving audiotroy grief, and stop preaching your F5, yes it’s good but there are many better for delivering big current into low impedance’s.

They’re the most prone of all devices to thermal runaway.

Tell Gryphon, Krell, Agostion  ect that little furphy.


Cheers George

All -

I must digress.

I have been in contact with Audiogon support regarding the removal of my post. Proof of the following response is evidenced by the reappearance of my post dated 01-11-2018 12:30pm. Their response is as follows. 

"I reviewed both of your post and they should not have been removed. Have no idea how and why that happened."

That gives credence to my original assertion as to to why they were initially deleted. Spam. Within the realm of spam, it was detected erroneously and programmatically, without human intervention.

The original post by @onhwy61 can also be restored.

Thank you.