@@Pre-posted amplifier series
@I thougt that single
amp which have 2nd harmonic distortion will be low
distortional if it was in NFB loop. It's bad. So I decided to
position them
in front of the amp.
@@Because harmonic distortion is precisely pure scale
harmonics.
P i|eds

Q u|eds

R Upside down amp

S Germanium amp

T PQ`wV

@ @@In this method distortion will go through to the end.
@By hearing test 12AX7 was beyond of all.
PQ`wV{Kanzen amp