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RE: I would say nearly all amplifier designs are conceptually WRONG!

#7 distortion vs frequency
My amplifier is tubed, push pull with minimal feedback and was measured on a HP distortion analyzer....0.08%THD, 1 watt, at 1khz, standard parameters, frequency response 5hz-80khz +/- (0), and a gentle roll off of 3db at 100khz, makes perfect square waves at 5 hz, and makes rated power 70wpc at 20hz.
My amp measures similar to Conrad Johnson, Audio Research, (their transformers are even better out to 200k), Quicksilver, Music Reference, Pass Labs, Jeff Rowland and many other well engineered amplifiers.
The measurements I have seen on my amp are not in agreement with #7 which tells me the sampling number was small, and some of the well engineered, linear amps did not make it into the mix.
I would be cautious about reading too much into following a "checklist" of statistical requirements of an amplifier. Buy well engineered amplifiers, do your do-diligence, and enjoy the music. Just remember Yamaha once made a zero distortion amplifier....lasted a year be a use it sounded so bad


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