Just wanted to add a couple of more data points for B3 tube rolling. I am now using a globe 80 rectifier with 4 to 8 pin adapter, a pair of NOS Cunningham 6BFG/VT99's with adapters, and for output duty a pair of Tungsgram E80CC's .
For context, my goal is what I call "spooky" sound. To me this means remarkable clarity with a deep, layered realistic sound stage. Second is dynamics which also contributes to that effect. Bass is less important to me but what is there should be tight and not overblown. A warmish midrange is nice but it usually seems to come at the expense of clarity in my experience. Add tonal accuracy to the list also. Am I asking too much?
I have tried a lot of different rectifiers, both directly heated and indirectly. Previously I was really liking the Sophia Aqua 274B. I also have a large number of 6SN7/12SN7/7N7/14N7/2C50. This globe 80 is pretty great as are the VT99s. They contribute to an excellent very layered, front to back, soundstage. I previously had a pair of Telefunken smooth plate 12AU7s in place. As the E80cc's break in they are really starting to shine. They are detailed yet rich also.