It took some time to get it sounding the way I wanted, and at some point I'm going to try 6CA7s and E34Ls and see how that goes.
Right now I'm running the same preamp toob cocktail that i have in my VTM: Chinese in V1, JJ803S in V2, and Sovtek LPS in V3 & 4. Running it at 8 ohms vs 16 ohms seems to give it some extra thump also.