So got to try out the new E83CC for a bit today...It was pretty much as advertised..bright-ish..defined and articulate, but the low end was not quite as tight as expected...kinda rounded off a bit., but not flubby.
A cool surprise was the Psvane I also bought.
My normal reference/always V1 tube in my Fireball is a long black plate Raytheon. The Psvane compares very favorably to that. The biggest surprise was on the clean channel...the Psvane had a "3d-ish" quality to it...almost an audible "glow"...gotta love us guitar players with our abstract crazy terms to describe what we hear.
Highly recommend trying the Psvane out..I got mine from Tube Depot.