As mentioned before you demand that we demonstrate why your individual
experience shouldn't be an exception to well known principles, summed up
in "I know what I heard" and no research will change my mind. The burden
is just oppisite, why is your not unique experience an exception? Below
is the proof you now provide, as well as continued proof of the mutual
reinforcement effect in non blind testing:
"I just rang up my friend who was with me listening to some of these
amps, and I asked him if he recalled hearing any difference among the
amps (he said at the time he did). He said it was 'easy'. He is not an
audiophile and does not have any high-grade audio equipment. He
confirms what I heard."