Scusate l'assenza... torno di prepotenza per dire la mia... o meglio per dare il mio feedback:
BTW I realized a preamp by taking the last Ubershall Blue Rev. schematics and it sounds great!
I used a Mosfet source follower too, as
Technik, but with a different configuration that looks to be very similar to the Cathode Follower response. I can't notice differences with the tube configuation (12ax7 as CF).
The tone stack has a wide control in all the tone range, and a "Sweep" pot has been added.
I also notice that it's possible to get more definition and more headrook by increasing the anodic voltage supply up to 350Vdc and more...
If you use it with a power amp, I think a good NFB has to be take into account
Felix