I am looking for 1 or 2 6000 tubes for the R-390A's companion, the T-368. Had a few NIB spares years ago but gave then away with T3 #1 when I sold it. Now I have T-3 #2 and a homebrew rig using a T3 exciter with no spares. any help would be appreciated. I have some 25AV5GT's, they work in the T3, but not the homebrew rig. Ed N3LHB