Best small signal tube for a preamp?


Is there inherently a "best" small signal tube for use in a preamp? Assuming all other things are equal-which of course they never are.
Choices are 6922/12AT7/12AU7/6BK7/6BZ7/12BH7/6H30II (and varients to the listed tubes - e.g. E88CC for 6922, etc.).
The reason for my question is that I am auditioning the Lector Zoe, which can use all of the above tubes by way of its SATC ( autiomatic tube adaptation) circuit and user switchable 6V/12V plate voltage.
I am interested in your reason, which might have to do with inherent sonic characteristics, predisposition for problems such as noise or microphonics, or availability and economy of NOS tubes being better for one tube type over the others. All responses are welcome, and in return I will let you know the results of my listening with the different tubes that I try.
mitch2
You're right Mitch- If a piece of equipment is already too bright or forward sounding, the CCa's might be too much(like a lot of cable mis-matches). I've found with the BAT VK-D5, CCa's and a pair of Kimber Select 1130s: everything encoded on the disc makes it to the rest of my system(nothing added, nothing missing). Great at reproducing the depth and width of the original recording venue's soundstage as well. This is what "tube tasting" is all about.
regarding the Zoe on tubes please remember the regular Russian 6h30 tube unless very closely matched can be as bad as a 6922 Sovtek the Best 6h30 which is very good is the DR designation this are the creme de creme scientific
grade and run at over $50 each I compared them and for sure they are very good and just a hair warmer then neutral.
lector zoe fans want to know where the best deals are on the 6H30 DRs.

thanks for any help. -ad
Best tube if your system sounds on the warm side are Siemens 12au7grey plate.I was running telefunken sounded great very warm but a little tubby in the bottom end.Put in the Siemens the midrange opened up with more depth and the bottom end tightened up with a bit more bang these are now my output tubes paired up with two amprex bugle boy tubes it sounds WOW! with my turntable.Pre amp is a jj electronics 243 from Slovakia.