To re-iterate a tiny bit of anecdotal amp data on Thiels.
I’m still having fun going back and forth between a loaned Bryston 4B3 and my CJ monoblock tube amps (140W side) on my Thiel 2.7s.
Anyone who thinks Thiels need gobs of SS power should hear this set up. Even compared to the Bryston, 140w of tubes sounds absolutely balls-to-the-wall energetic, punchy and dynamic.
The Bryston provides a tiny bit more grip on the sound, but the bass is by no means "loose" with the CJ and it sounds at least as punchy, probably even more so. With the CJ the sound seems more "live" IMO.