Nobelium is based on the Noble. Not a lot in common with a Fender preamp aside from the tonestack.Nobelium and UA users... What's the diff ? If I have it ... both are based on the Fender / RCA tone stack. The Showman variant has passive mids. In that variant, 2-10-2 was approximate flat. The UA has way more low end on tap - a good thing in my book. So What does the Nobelium bring to the table ?