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



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