Great thread, this is the education I've been hoping for recently.

I've got a Roland Cube 30x, which has clean - JC - then alternates to the modeling mode. With my Duncan bucker equipped guitars, I have always loved the sounds, and others have often commented how sweet my guitars sound through that amp, when on clean channel....

Recently I went into a luthier here in town, a Yugoslavian dude who builds jazz boxes, custom only. ALL he sells are the Rolands, and he told me it was for that reason. I was pleased to think I had stumbled onto something so well respected. I then began researching the JC120 to understand where it's used.

I also have a little lanilei, which utilize one 12au7 and one 12ax7a, and is intended to emulate a plexi in a package the size of a 6 pak. It hs a clean setting as well, but is hardly the clean I'd become accustomed to with my Roland. This is all helping me too understand where the sounds come from.

Long story short...check the Roland for a clean that is HARDLY flat and
unpleasing......

http://www.dancheguitars.com/
http://www.mahaffayamps.com/little-lanilei-3350lt.htm
http://www.roland.com/products/en/CUBE-30X/