In my experience all signal/power tubes can make a 'difference'. After trying the crop of present makes in power and signal, I am now switching between Gold Lion KT88 and their KT77, and for signal tubes, NOS Brimar and Mullard. This is for the Rogue 88 Magnum. My pre (Audio Mirror T-61) uses the 6n1p and is presently running a NOS RCA rectifier. I am in the middle of tweaking a set of Devore 0/96 clones, and the KT88 are big and vociferous, but the KT77 are just perfect in terms of warmth, voicing and dare I say...fidelity (when using tube gear)...
