FWIW, I owned a SM3 for a year or so and I agree with Frogman. Not my cup of tea either. I traded it in for an ARC SP10. No mistake there. The difference was huge. I had a Perreaux stack and the best component in it was the TU3 tuner which I kept for 20+ years. I also had a Threshold SA-3 which was much smoother than the Perreaux 2150B amp too. It (the 2150B) really was a 'sand' amp. Oh, BTW, my SM3 was mechanically unreliable as well. Back for repairs 3 times.
