B1 with Korg Triode

After some more listening I think in my setup with M2 I prefer positive phase second harmonic - it adds a bit of sharpness and presence I was missing. It also sounds very good at low volume levels.
This preamp is a brilliant tool for adjusting sound according to preference. I learned a lot by playing with it. It makes much bigger difference than P3 pot on BA-3 front end.
 
Thank you, looks real nice.

Thanks. My speakers sound quite polite with M2, adding negative phase second harmonic makes them even more polite. Positive phase second harmonic adds a little bite, makes everything sounds more real, similarly to my 300B SET. But that's just my opinion with M2 and Audio Note speakers, I may prefer negative phase second harmonic in different setup.