Interesting comments- I had a Vac Phi Beta and Luxman 590ax in my room on Zu Definition 4 speakers. I would say the Luxman was very, very warm and smooth compared with the Vac. The Lux was like butta' and I didn't like it one bit. On the other hand, the Phi Beta to me was a tad rolled off, go figure. I rolled lots of tubes in it as well (Psvane 12ax7s, Shuguang Black Treasure KT88s, etc).
I've also had the Phi 200 in my system compared with my McIntosh 601s at the time- I felt they sounded really similar, which surprised me. Bass was not tube-like fyi. I didn't get to roll tubes in that amp, however.
Perhaps this is just a long way to say that I couldn't get Vac and Zu to work right. I heard the Sigma 160i on Tads sound spectacular at an audio show, so I'm well disposed to Vac amps.
I've also had the Phi 200 in my system compared with my McIntosh 601s at the time- I felt they sounded really similar, which surprised me. Bass was not tube-like fyi. I didn't get to roll tubes in that amp, however.
Perhaps this is just a long way to say that I couldn't get Vac and Zu to work right. I heard the Sigma 160i on Tads sound spectacular at an audio show, so I'm well disposed to Vac amps.