Luxman 590axii vs Pass Labs int 60


Anyone had the opportunity to compare these specific amps? Both are "quasi Class A" amps. I auditioned the int 60 and was extremely impressed and even more so when hooked to the MSB ADC V. How does it compare to the Luxman 590axii? They seem to be in direct competition with each other. Which do you like best?
audiofound
I have auditioned pass labs int-250, Luxman 590axii and 509x. Not auditioned Pass labs int-60. 
I can say that Luxman 590axii is pure gold and musical. You will not go wrong with it and will thank everyone who have recommended. I have been reading audiogon discussion forums and that made audition Luxman 590 and 509. I am glad I auditioned them. Now I am big fan of Luxman, especially 590axii.. I have bought one and use them every day. So musical and tube like, you just don't stop listening. Don't go close to amp, they get heated up soon. I guess that is a feature of any class A. 
Anyone here using an external Preamp with the Luxman 590AX II? I'm curious how good the built in preamp is. I'm wondering what a good Tube pre would do to the sound. Maybe too lush??