The amp is class-A, 25W, using EL34 tubes, push-pull. I have listened to it for short periods and it sounds very nice. It is simple, features-wise, for its price class. but it is beautifully made. (For comparison, the Audio-Research i/50 has 50W, options for an on-board DAC and phono preamp modules, a headphone amp included and a remote, the Margules has none of those features, either stock or as upgrade options.) I am not suggesting the Margules isn't worth its asking price, but the company has placed its priorities elsewhere. With higher sensitivity speakers and a good DAC, I would think it could be the center of a very good system.