Among the amps I'd recommend with your U-1's include models from Parasound (JC-1), Pass Labs, Levinson, Accuphase, Jeff Rowland, Clayton Audio, and Warner Imaging. I'm sure there are others, but I'm limiting my comments here to my own experiences. Disclaimer - I peddle some of these lines (as well as Sound Labs).
If wall juice is indeed a limiting factor, you might want to consider the Model 501's from Jeff Rowland.
Duke
If wall juice is indeed a limiting factor, you might want to consider the Model 501's from Jeff Rowland.
Duke