I own the Luxman L-590ax integrated class A amplifier and it is excellent. The class A design makes the music sound very real to my ears. Yes, the class A amplifier runs warm (some people say hot) but is is not a problem as long as you keep it on an open shelf. Based on my positive experience with Luxman, I would encourage you to listen to one of their class A integrated amplifiers and not their class A/B designs. Based on my previous amplifier, the Ayre AX-7e integrated, the 590ax has more detail, the bass is much better, it is clearer and the overall sound quality is much improved over the Ayre unit. I like the 590ax very much and highly recommended it.