I have owned the Atma-Sphere MA1 and M60. I have also had the MA2 in my system and OTL is the way to go IMHO. Now I haven't heard other OTL designs so this might just be an Atma-Sphere thing but these are the best amps I have heard or had in my system. The only drawback is they run hot. Now I don't know too many Class A amps that don't run hot. You do need to listen to OTL designs.
