I'm the new (proud) owner of an Egnater MOD 50. Bassman and SL2 modules. (Review pending) I have some Ruby Tubes in there now, but during it's paces, I wasn't as thrilled with them as I could be (had the same experience with Ruby when I owned the Triamp). Be nice as backups, but I think I can get more tone out of there. What is your favorite EL-34 tube inside a 'Marshall style' amp? I'm considering: -JJ EL-34L -Svetlana -Groove Tubes Mullard reish -S.E.D Any suggestions?