I have tried several amps on mine, including a triode amp - ARC Classic 60. It matched well.
Tried a muscle amp - Plinius SA-250 - not particularly impressed.
Pass Aleph 3 was nice, but too lacking in bass for my liking.
Currently using Spectral DMA-90 which is probably best of all, and is beautifully transparent (with the right cables).
Good luck
Ron