Right on, I've heard nothing but good things about that amp, glad it is working for you. I did some tube rolling in my Schiit Freya preamp which uses the 6NS7's and could hear pretty big differences between the tube sets. My Carver RAM 285 comes with all Tung-Sol tubes I believe KT-120's power tubes and 12ax7 & 12AT7 input tubes- I have not considered trying different input tubes but maybe I should?