6SN7 tube GTA vrs GTB

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

Thanks

fordmod07-04-2008 3:14pm

amandarae Details Discussions Posts This discussion Message User 512 posts 07-04-2008 at 04:51pm Copy Comment URL Report Comment Edit Delete GTA: Max Plate Watts=5, GTB: Mpw=7.5 GTA: Rp=7700, GTB: Rp=6,700 Plate Current: GTA=9 mA, GTB=10 mA