Bib,
Yeah, count me in on the JJ's as well. I think they sound fantastic and take a bit of a beating. The screens seem to act up less than the Sovteks. The Sovteks always worked fine for me, but I have not tried the EL-84 EH's yet. About Mullard, Telefunken, or Amperexes, etc., for that kind of BIG $$, I know most people here can tune an amp to sound killer using the current production EL-84's. Also, the Svetlana SV-83 is similar to an EL-84, but the screens can't take more than 200-250VDC or they will self destruct. In order to use these, you would need to drop some screen votlage/current draw. As for the JJ's, you absolutely can't go wrong with these IMO. I haven't tried the Ei EL-84's yet--been meaning to give them a shot soon.
For preamp tubes [don't shoot me!!
], but I actually like and use an older batch of Sovtek 12AX7 WXT's for both channels gain stages and a 12AX7 LPS in the Phase inverter. I also use and like the 12AX7 EH's, RCA [NOS] large ribbed plates and small rubbed plates, GE gray ribbed plates, Amperex [Globe] short smooth plates and long plates [Globe], etc. I also scored some RCA Gray ribbed plate 5751's at a local flea market. They sound good in the PI section, IMO. Chinese 12AX7's also sound pretty good as well [Mesa Boogie SPAX7's and 12AX7's form some old amps that sounded pretty good at the time].
The LPS and EH's are very good sounding tubes for the most part. Relatively quiet and high gain. As far as the Ei 12AX7's, I haven't tried these ever. From what the guys wrote, they sound very worthwhile. I have read that VTL [Vacuum Tube Logic] was partial to the older Ei 12AX7's for use in thier amps.
Jason
k, you knew it had to be coming, so lets hear it! 
