[Formerly YB-2]

Originally Posted by TorqueBull

Now, it occurs to me that what I have not done is an A/B comparison between the two 75s and a single 275 - I wonder if that exercise would bring me full circle to the conclusion that one 275 is better than two (not an uncommon view among us!)

Fun discussion...

Being in the group that found the MC75s the best, followed by a single MC275, a pair of MC275s in a bi-amp configuration and the pair of MC275s as monoblock amps to be the least good, my surmise is it not only the 'stronger' power supply in the MC75s helping out, but having only a single pair of power tubes per channel also being important. For whatever reason, to my ears, in both tube & solid-state amps, those with the fewest power devices generally sound the best.