Revel Studios and Tube Amps

Probably but your room and listening habits are factors. I use them with 200wpc tubes and similar SS amps.

I use mine with a 200W Levinson amp. (I used to use a 100W Levinson amp, and while it worked acceptably, it sounds much better with more power.)
I really think that 100W is about the minimum, but to be honest, I have not tried it with less.

Good Luck and keep me posted if you do try it with less.

I believe Kal Rubinson of Stereophile uses SF Power 3s with his Studios...