It really depends on the circuit and your taste. My preference is Telefunkens, which are a smooth-sounding tube and seem made for my Jadis equipment; old Mullards are also quite good, although in my Jadis (and my Audio Logic DAC) they sounded a shade too bright, though a little punchier and livelier than the Teles. I'm sure others have their favorites, but it would be helpful to you if they used those tubes in the Rogue and could report on the resulting sound. Otherwise, do some tube-rolling of your own to see which tubes you like the best.
