Okay, for those of you following my venture into tube-amp-dom, I have decided to go with the Mesa Boogie Strategy 400 (thanks, RockBobby!) - at least for now! I wouldn't rule out a Demeter or Aggie in my future... But, to allow my new (to me) Strategy to get off to the best start possible, I think I am going to just throw twelve new power tubes in there (and probably four 12AX7's, while I'm at it). The Strategy is normally configured with 12 6L6's, though it can accept EL34's in the rear bank. It is a stereo configuration, if you don't know. Also, Boogie uses a fixed bias, so I need to come up with tubes that are appropriately biased (either "Mesa Boogie Approved" or known to work properly in their amps). The topics upon which I am soliciting assistance are: 1.) Does anyone have any experience with running Mesa Boogie amps with 12 6L6's versus 8 6L6's and 4 EL34's? Any thoughts at all on what type of tonal difference I might expect? 2.) Any suggestions for specific tubes? I am not looking for an overly warm sound (I know it will be somewhat warm, but I don't want to go overboard in that direction), but I do like the complex mids of tube amps. I know the low end won't be as tight as my big old SS amps, but I'd like the bass as tight as possible, all things considered. 3.) Where to buy my bottles? Thanks for all the help in prior posts and for the help to come! Tom.