Tubes on Proac 1.5's

I just borrowed an older Sonic Frontiers 40watt tube amp and my wife and I are stunned by how much "percieved" power this amp has. The Classe' is more refined with more bass slam but the tube sang along really nicely.

I must learn more......

Thanx for the replies

I am using a Sonic Frontiers 80(KT-88's) and an Audible
Illusions pre, I love this combo. My speakers are the Responce 2. What I noticed a real help is a subwoffer. I do not know how much room you have aviable, but if you can stick a decent sub in the corner it will make the music bloom.

The bass is really quite acceptable with the sfs 40. Now I don't know which way to turn.

I haven't heard the Classe with the 1.5's but I have experience with other Solid State,Hybrid and All tube integrates with the 1.5's. While I believe they can sound great with ALL TYPES....I much perferred the all Tube KT 88 amp. The tube amp seems to just open the 1.5's like I have never heard before. More natural sounding, fuller midrange, just more addictive sounding. This vaccum tube thing is awesome!

I don't know a lot about the different tubes and it's really great to hear these many opinions. I'm leaning towards a VTL MB125 mono setup.

While some of you mentioned KT88's I need to know if this is just a tube swap for EL34's (sorry REALLY green here!)