Trem,
Voodoo's post is absolutely right on.
My Traynor ycv 40, Traynor yba 1, '65 Fender Super, all have JJ's from Eurotubes. Mr. Bob Pletka spoke with me on the phone for some time to be sure I'd be happy with each set of tubes for each amp. He is very knowledgeable, friendly, and ships orders FAST! I think each order took 2 days to get to my mailbox. In every one of my amps, there was a noticeable difference (much better) over the Sovteks and Groove Tubes I replaced.
You should check out his website when you have time. That is where I found TheFret.Net, by the way.
Glenn