This is topround posting from the Bahamas under another name.
I had the Dude in my system for a rave. It was an early version, it seems there have been several upgrades since the version I heard. I was floored.
Deep , huge soundstage, tremendous tone, very very musical. Clearly world class, in a class most of us have never experienced.
I am fortunate in that I get to hear many very high end pieces. This was clearly superior in many mnay ways to almost every pre I heard except maybe the Ypsilon. And depending on system you may prefer the Dude. A friend called me one day flipping out about a preamp he had heard in his system, he was flabbergasted, I asked what was it, he said some preamp called the dude. I knew exactly what he experienced because I experienced it firsthand myself in my own system.
I am sure there is a certain amount of synergy that is required here for it to work well, but it seems to work well in most systems.
As an example, it is certainly better than a ARC ref series pre, way better than my Sira, or Hovland, no contest at all.
Don't know how many have heard a preamp that did not use caps in the line, such as a transformer coupled pre. These designs just get out of the way of the music, very open and detailed yet delicate and musical, they have finesse. The Dude is a cap coupled design, but it has many attributes of a transformer coupled design.
You may be disappointed with build quality as it has wires strewn about in a sloppy fashion, but it sounds better than 95% of most pre's out there.
How he does it? Not sure.
I have a First Sound pre with massive power supply just like the Dude, the Dude crushes my First Sound in every way, Imean evvery.
It uses a ladder attenuator, I played with many pres like the CAT that uses a massive power supply and ladder attenuators, and it crushes the CAT.
Not quite sure what is so special about what he is doing, it has not much to do with parts quality or build quality because it sounds awesome regardless.
Parts quality has gone up as has build quality, but I heard one that had cheap parts and tubes and bad build quality and it was amazing, so go figure.
My experience left an indelible impression on my, one I never forgot. I will probably sell a few things to buy one. It will make your walls disappear and you sit in a deep stage of wonder.
There is so much hype in this hobby. This pre has no hype around it at all, in fact the builder, Paul, doiesn't really like bulding them as he has som many other projects in line.