Cube Audio Nenuphar Single Driver Speaker (10 inch) TQWT Enclosure

Stephen,

I haven't tried the Ayon on the Marigo Labs L3 platform and isolated by the Marigo Labs E2 Mystery Feet.  I also plan on isolating all of the tubes with acrylic cylinders like Allnic Audio components.  I'm sure the butcher block amp stand under the Ayon rung like a bell.  I will have to reserve final judgement until then.  They sound very similar but the Ayon is a little more detailed in the midrange and may be a little more dynamic.  The FW SIT-1 definitely has a lower noise floor.  I faintly hear tube hiss on the Ayon when not playing music but the FW SIT-1 is dead silent. But there is something magical when the entire singe path including power supplies is SET based. Planning on keeping both.  They are back-ups to each other.   

Too bad Pass Labs can't develop another source for static induction transistor devices.

   I suspect they could have their own made, but it wouldn't be cheap. It sounds like that is what Aries Cerat did. This summer EnjoyTheMusic had a short new item on Aries Cerat and their new Ianus series of electronics.
www.enjoythemusic.com/news/0720/

Aries Cerat Ianus Series amplifiers is a showcase of the company's unique TriodeFet technology. After years of developing and refining their technologies, they are proud to introduce the TriodeFet technology, and a Series of amplifiers that implements this truly innovative technology. This technology is neither a hybrid topology (in the usual sense of a tube-driving solid-state stage type), nor a solid-state driving tube kind of stage. TriodeFet is a new way of using hollow and solid-state devices. The concept is to have a low voltage / high current active device, which had the linearity of a triode, and at same time would be able to source enough current to drive low impedance loads directly.

The TriodeFet, can be seen as a three terminal active element, just like a MOSFET or a triode. The company's breakthrough is that its transfer curves are identical of a true high quality triode, with the only differentiator from a true triode is that, the Y-axis (current) is in scaled in Amperes and not mA. What this means, is that you can design circuits that were never before possible either by using tubes or transistors. This new active element can be used to develop simple, very linear circuits, which are stable down to very low impedances, while the TriodeFet's inherent linearity is making the use of the problematic negative feedback redundant. New models within the Ianus Series include the Geminae (€110,000) Class A amplifier that produces 130 Watts @ 8 Ohm. Aries Cerat's Essentia (€39,000) is the little brother that produces 40 Watts @ 8 Ohms.

@rwpollock Perhaps you’re just suggesting that pass finds a new manufacturer for the SIT devices? The first run was custom made by Semisouth for Pass Labs (hence the Pass label on the transistors), but they have since closed the factory.

Some interesting discussion here with input from Nelson: https://www.diyaudio.com/forums/pass-labs/222098-semisouth-goes-dodo.html

Correct. It's not my field, but I wouldn't be surprised if there aren't chip foundries that will do custom work and small runs. Not cheap, but perhaps Pass could buy a passel from Aries Cerat or have their supplier make a different version.

Maybe he will given the success of the sit amps. I've heard they're starting to get low on their supply and the sit3 was only possible because the parts have been so reliable. Previously, those transistors had been held in reserve for replacement service. 

Funny that Nelson said this in 2012 (from the above thread on diyaudio):  "I predict that long before I run out of SITs there will be some new, perhaps more interesting devices to play with."