I have been using SET amps for better part of 5 years. Even before the SET amp was in vogue. But the one thing I was missing was the dynamics that real music has. Even a soft piano passage has dynamics. The speaker I am using are pretty efficient and they have a fairly flat impedance curve but they did not have dynamics. A friend sold me a 1959 fisher integrated that uses EL84 output tubes. I just thought it would be fun to play with, WOW. I kept telling myself this just isn't right, fast, great sound stage front to back, side to side, great placement, and great DYNAMICS. A few mods later, and it is even better. Now my curiosity was heightened, I bought a pair of Manley EL84 based Mahi amps (Mahi, Mahi). I got to tell you, if your speakers aren't power hungry these little amps will certainly change ones opinion that SET's are the end all in amplification. This little tube has the speed of SET's and the b___'s of a P/P tube amp. Just my humble opinion