Here are few combos of 6sn7s that I have used and think would meet what your looking for in sound.
Ken-Rad VT-231 (black glass) in front of Sylvania VT231s.
Sylvania 6sn7W metal base or black base tall bottle in front of sylvania 1952 tall bottle bad boys.
Ken-rad VT-231 (black glass) or 1952 bad boys(sylvania) in front of any of the sylvania 6sn7w tubes.(metal base, tall or short bottle) I've used these combos alot and have found them all very nice. I also like the TungSol roundplates and National Union Black glass alot but not sure if if these are what your looking for. Worth owning and trying though.
