Different circuit designs accommodate different components. To say any amp is good or bad based on the fact that it has either transformer or direct coupled outputs without listening is just a foolish generalization.
MAC Autoformers?
Someone is selling a MAC MA6500 Integrated claiming its superiority over the Ma6600 due to the fact that "it does not have the degrading autoformer design found in the MA6600". That is the first time I've heard a claim that the autoformer was a hindrance to better performance; I thought quite the opposite. What do you MAC Maves think?