Splendid amp, don't worry about the bass: it offers plenty of it, it's more a matter if your speakers are good enough. Have owned it for three years now, Tungsol 6550 makes a fantastic match as for tubes.
I owned the Unison Research Unico SE hybrid integrated. 140 wpc into 8 ohm and 225 at 4 ohm. Preamp used 2 EH or Mullard 6922 tubes. I thought that it was one of my favorite amps that I have owned. I sold it when I switched to a speaker that was 86db 4 ohm. The unison was better paired with a speaker that was 90 db efficient into 6 or 8 ohm load. As always, synergy plays an important role in what you may experience in your own system.
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