Henryhk: I'm driving Genesis 501's with my VAC PHI Beta. Plenty of power to spare. The Genesis are tunable to the room with built in equalizers- and I find that invaluable. The Vac makes me smile everytime I play music. About 50% SACD's and 50% vinyl--equally good for both. I am an acoustic bass player and the sound is so very accurate. I had Macintosh SS poweramps (501 monoblocs) with Mac tube pre: C2200. I have lost nothing going from SState to all tubes, and feel that I have gained an intimacy and presence which I formerly lacked. Good luck!
Joe
Joe