Devialet for Wilson Audio Sasha 2 Speakers

As far as I know Nelson doesn't design anything with BJT outputs.

Suggest you look at nearly all the bigger Thresholds amongst others he designed.

Cheers George 

@georgehifi 
"Doesn't" is a present tense term. Threshold gear is hardly "modern era" stuff. Nothing that's come out of Pass Labs or First Watt features BJT outputs or inputs. Everything from Pass Labs and First Watt uses MOSFET, JFET, or SIT output devices. 

Even so this sort of impedance and -phase angle load that the Sasha presents in the bass needs a lot of current to drive, and BJT’s do that better than Mosfets can.
https://www.stereophile.com/images/archivesart/710Wilfig1.jpg

Cheers George

I get it, but I have no idea where you get this idea a huge bank of FETs don't get the job done. I'm listening to an F5 I built right now and the whole reason Nelson designed it with 3 way current limiting is because those MOSFETs will switch the full power supply current in tiny fractions of a second. My Focals aren't as brutal as those Wilsons, but with a low point of 2.8 ohm and a -56° phase angle at 4 ohm, these will draw some current. This F5 drives them with absolute ease. If it struggled at all I'd be seeing serious rises in output device temperature which isn't happening. I see maybe a 5°C rise under the most taxing volume and material. I have no doubt an INT-60 would have just as easy a time with the Wilsons. 

Device for device a BJT will out current a Mosfet.
Given powersupply conditions are right for both. Sure 10 complimentary pairs of Mosfets, will do a certain "current job".
But 10 complimentry pairs of BJT’s will do a far better "current job".
That is why Krell and Agostino and others use BJT’s, as they want to be able to almost double the wattage for each halving of impedance load all the way down to 2 or even 1ohm, to drive things like Sasha's and Alexia's

Cheers George