[Otto]

Ron,

Those are some cool amps! Actually, they might ket kinda warm, but you know what I mean...

In looking at your measurements, there are some significant differences that I wouldn't necessarily epxect from simply swapping power amps. While I would expect different amps to impart a somewhat different character to the sound, I usually find it's somewhat nuanced.

Can you hear the difference? Were the measurements repeatable? I know they're going to get more and more difficult to accurately capture as you increase in frequency. What kind of smoothing did you use on the plots? Just curious. I wonder how the amps would measure electrically. Interesting result!