Two of my three amplifiers are Atma-Sphere MA-1, and Conrad Johnson LP140M. Both sound great for different pieces.
Nothing beats the Atma-Sphere for solo instrumental works, or duets/sonatas for two instruments. While the Atma-Sphere is exceptional for the aforementioned pieces, the presentation of bass/tympani is slightly muted.
The Conrad Johnson is slightly colored in presentation, but sounds very musical, and is the most relaxing to listen to. It has a stronger bass representation, and is a very good all-around amplifier: it’s not a delicate or transparent with solo-instruments as the A-S is, but with more complex orchestral pieces, it does a better job of piecing the dynamics of the instruments together.