Not solved....i would like people to use mismatched (this happens normally as PNP has always more gain...hard to be matched...possible but hard)...these harmonics are really lovely...i would like people to have it...this sonic colouration is nice and usually much appreciated.
I have matched one unit to compare....perfectly matched, i found sonics stérile....lifeless when compared to another channel made from junk parts....at the end...the music beauty comes from these harmonics....harmony and harmonica is what people uysually loves...some production of tube like harmonics are very welcome....well...this is deeply personnal, very subjective stuff....but seems people is enjoying a lot... i am having no complains.... exactly the opposite..people feel the amplifier better than others and use to say they are deeply happy.
The distortion informed (0.003% THD) is from simulator, and serves to the ones evaluate audio by numbers....i don't....i do believe and i am sure about, that real world is different than simulator products, as simulators have matched references and real life things faces enormous mismatches in values of components (tollerances).... the real thing is not simulator results...real thing is audio playing and humans evaluating...when we have the "good harmonics"...we feel good and we appreciate the amplifier.... gladly people does not listen from the simulator..or they may dislike the sonics.
In the simulator usually transistors do not even burns...you can put 2N2222 draining 20 amperes...funny thing.... only fuses use to burn in simulators...so.... they're a nice tool...but just a tool.
Audio, as you know and may agreed, is made for humans, and not for instruments... we could never see instruments going shopping for audio equipment....but human goes shopping..these are the ones we have to satisfy..not instruments.....we have to make audio for them (humans) to make them happy and satisfied....not instruments.
regards,
Carlos