Some further thoughts on the class issue, and the Lux amps in paticular;
From what I have experienced with these paticular amps over the 15 years or so of listening to them in various systems, here are some personal observations;
In class A mode these amps can be biased hot, [around 2 Amp] or quite cold, [around 900 MA] somewhere in the middle there is a sweet spot, [which will be dependant on the rest of the system, But personaly, I would say around 1.2 Amp] ] the following descriptions are somewhat extreme but hopefuly it will get my point accross; If the amp is biased too hot, it can sound slow,Fat, and ploddy, if its biased too cool, it will sound quicker, but lighter, and more forward sounding etc, to be honest,as a starting point; these amps sound very good in the A/B set up, [as stated in an earlier post, the class is determined by the Bias, and the selected transformer windings etc]I guess what I am saying is; Just make sure the amp is set up properly in its chosen class, before evaluating it properly.
Good listening.
A...