6SN7 tube GTA vrs GTB


I would like to know the difference between the designation GTA and GTB.

Thanks
fordmod

Showing 1 response by roxy54

I am not sure of what you consider "royally expensive", but I think I agree. I just paid $60.00 each for NOS Sylvania 6SN7s that are supposed to be "the" thing. I hope that they are worth it when they arrive.