hey bwhite (brian?)... i checked my kenrads, and they say vt231. something about them, maybe because i have them in my vac as well... just too much. sounds a little more veiled than the black glass tungsol.
you also liked the sylvania metal base 6sn7W... would this be similar to the black base, top getter, sylvania 6sn7W? i have a pair of these, and thought they were extended, but a little thin...