Fatparrot, I was waiting for more experienced users of the tube to chime in first, but since no one has yet, I'll post.
Did you want to know what the actual GT, GTA, GTB, W, VT-231 designations mean or were you more interested in their sonic characteristics?
I've been rolling different 6SN7s in my Blue Circle preamp for over three years. I don't actually know what any of the suffixes stand for, but I have learned some of the tonal differences and which ones I like more than others.
I've found that the different manufacturings such as Sylvania, RCA, Raytheon, Ken-Rad, Tung-Sol, etc... all have their own distinct flavors as well.
Did you want to know what the actual GT, GTA, GTB, W, VT-231 designations mean or were you more interested in their sonic characteristics?
I've been rolling different 6SN7s in my Blue Circle preamp for over three years. I don't actually know what any of the suffixes stand for, but I have learned some of the tonal differences and which ones I like more than others.
I've found that the different manufacturings such as Sylvania, RCA, Raytheon, Ken-Rad, Tung-Sol, etc... all have their own distinct flavors as well.