Yes, at the moment I am using a Viva Solista , 22 watt, 845 SET, with my new Da-RMa's. It is a wonderful amp and makes a great sound, but I feel the frequency extremes, particularly the base, could be better.
I am a fan of Marty at Bound for Sound and I still remember a comment he made about the DA1's, some years ago. This was to the effect that the speakers were efficient and could be driven by low powered SET's, but that conventional coned as opposed to horn speakers, particularly with multiple drivers like the DA1, would open up with more power. A confirmation of that, maybe that Lou demonstrates his speakers with the 150 watt Modwright amp.
As it happens, I am going to audition the Emille K40 today, as the name implies, a 40watt tube amp. Next week I am going to listen to the Pathos Inpol, a 50watt Class A, tube/SS hybrid. I will report back about the benefits of more power