I have reverted back to the original TP 2.0n version. The older wire harness, although not quite as quiet, sounds much more natural than the new harness( at least in the TP 2.0n version). Regarding the tube choices, I have found that an early 1960 Siemens Cca with the grey plate to sound the best in the critical 1 and 3 locations. I want to experiment with some different versions/brands in the less critical 2 and 4 locations. In the meantime, I like some late 60's(?) Siemens A-frame E88cc in those locations for now. The combination gives me a very large soundstage with excellent depth. My next minor tweak will be to experiment with some copper shielding for the old wire harness. For now, I am back to my happy-go-lucky self. I am also happy to still be in the AH preamp family, although you may call me the black sheep of the family, if you wish. (o: