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.
1 J-FET
2 V-FET
3 Upside down amp
4 Germanium amp
5 12AX7
In this method distortion will go through to the end.
By hearing test 12AX7 was beyond of all.
12AX7+Kanzen amp