Tbooe, with all due respect, I'm glad your very excited regarding auditioning different reference level tube preamps, however let's not jump to the conclusion that they are far superior to the best of the reference solid state preamps around today.
The best of the reference tube/ss preamps sound much more alike then different today. Some still think regarding harmonics( leading edge-body-decay trails of an individual note) that tubes are more "real" sounding, but the great solid state gear I think nails this aspect of sound darn well along with the other virtues(no noise floor-microdetails-slam) that solid state has to offer.
Being a curious audiophile myself, I am now going through an audition of a very highly regarded/respected Japanese tube preamp that sells for $8000.00 to see if I was missing something by not having tubes in my system.
To be totally fair it's still breaking in, however so far it offers no significant sonic virtues over my Placette Active Line Stage. Maybe, a "touch" warmer, maybe, but it does not offer the details and soundstaging abilities that the Placette has. I have not decided if that smidgen of warmth is more "musical/organic" or not, even though it's slightly different.
Also, this linestage, being a tube preamp, should not be left on all the time, it's designer believes that a remote control would damage the sonics, so no remote, and finally the issue of retubing, I know tubes in preamps last for years and some audiophiles enjoy tube rolling, but I find these all to be hassles that I would gladly put up with if I heard something I wanted that could only be provided by a tube preamp.
It always comes down to personnal taste and system synergy regarding the best decision for our systems and enjoying music through it, so I hope you don't jump to the conclusion that a tubed preamp offers you something you can't get with a great solid state preamp, and go alittle further with your auditioning process and try a Placette, the new Bent Audio TAP passive, Accustic Arts MK3 preamp before making up your mind.