I do not agree with the "high current needed" comment. I'm currently running them with 27WPC Audio Note Japan Ongaku SET amp and they sound spectacular.
I also have a big, DIY 35WPC SET monos based on GM70 tube (think Lamm ML3 for the poor) on loan from a friend and they also sound excellent with Sophias II - in fact, better than ANY transistor amp I tried (and I tried quite a few - Dartzeel, Lamm, Pass, Krells - you name it).
I also have a big, DIY 35WPC SET monos based on GM70 tube (think Lamm ML3 for the poor) on loan from a friend and they also sound excellent with Sophias II - in fact, better than ANY transistor amp I tried (and I tried quite a few - Dartzeel, Lamm, Pass, Krells - you name it).