I agree with Oakleys, I love Class A amps. There is a naturalness to them akin to tubes, though many Class A amps are tubed of course. I find class A/B solid state, largely unlistenable in the long term. There is a grain, grey tone to them, I can'nt live with. There are exceptions of course, the only one I can think of, was the Lavardin IT.
I use a Pathos Inpol now, a 50watt Class A, tube mosfet hybrid, I just love it. Compare it to the A/B equivelant in the line, the Logos, it is totally different. I could'nt use the Logos long term. If you are looking at Class A then the Inpol or smaller TT, Pathos amps, are worth a look