I'm not sure of your budget Goldman, but if you're mentioning the Mephisto stereo amp, well that's a $57k amp. At that level, you could also look at the awesome new Vitus SM-011 mono blocks. They're a definite step up from the SIA-025 and have a lot more power/control. The little Vitus amps seem to sound a bit warmer/more romantic than the bigger amps such as the SS-102. That said, the SS-102 sounds very natural, analogue-like and is the most unfatiguing amp i've ever heard. It is the only amp I've heard which tames the older YG speakers tendency to brightness and a 'metalic' sound. Even the little SIA-025 is a peach. It depends on your system needs and how deep your pocket is. One thing to keep in mind; Vitus sounds best with Vitus. If you go for SM-011 mono's or an SS-102, my next upgrade would be an SL-102 pre. Hope that helps!
Class A Coda 15.5 Vitus SS-102 or Gryphon Mephisto
Looking for input on experiences on great Class A Amps. I have proposed 3 fantastic Class A Amps at their price points. I don't know if the Gryphon is that much better then the other two. Let's face it, Vitus and Coda make killer amps. Please weigh in with your experiences on the proposed three amps or any other Class A amps that offer all of the virtues of Class A. Thanks.