There are plenty of threads on Audiogon about the Dude. It is probably best to direct your questions there.
I will say it was significantly better than the last preamp I owned, which is highly regarded. And that preamp was significantly better than the one before that.
What struck me about the Dude was how natural the sound was and how linear the presentation became. I never knew what linear presentation 'really' meant - what did people mean when they described a piece of equipment or tubes being linear. With the Dude I now understood - a tonal balance with all frequencies. Honestly, it was 'ear' opening and educational for me.
This is only my experience. I have tried very few preamps and done very few side-by-side comparsions.
I will say it was significantly better than the last preamp I owned, which is highly regarded. And that preamp was significantly better than the one before that.
What struck me about the Dude was how natural the sound was and how linear the presentation became. I never knew what linear presentation 'really' meant - what did people mean when they described a piece of equipment or tubes being linear. With the Dude I now understood - a tonal balance with all frequencies. Honestly, it was 'ear' opening and educational for me.
This is only my experience. I have tried very few preamps and done very few side-by-side comparsions.