CAT Ultimate/Tube rolling

i use telefunkens on 12AX7 & amprex on 6922 ,i like this sound more than the stock tubes..(pulls you into the music more)

Telefunken (matched) -- IMO they enhance the CAT's characteristics: clarity / resolution, effortless dynamics, and tube beauty. However, take more than usual care when changing... Beautiful machine, IMHO the best tube pre. Enjoy!

I have tried Telefunken 6DJ8, Telefunken 6922, Telefunken cca, Telefunken 7308, Sovtek 6922, Amperex 6922, Siemens 6922, Telefunken 12AX7, EI 12AX7 and Tungsram 12AX7. I would rate the Telefunken cca's highest of all the 6DJ8 tubes, but for those for whom that is too bright, I would use the Telefunken 6922's. I did not like the Telefunken 7308's at all (too bassy, rough and unrefined). The Siemens and Amperex were somewhere in between. IMO, the stock Sovtek's were clearly inferior. I liked the Telefunken 12AX7's the best, although the EI's were very good and I could easily live with them. I felt the Tungsrams were rolled off in the bass. Generally, I feel that Telefunken's in the CAT Ultimate give great bass extension, great dynamics and a smooth, neutral, liquid midrange.

I use the SIEMENS goldpins at this moment, very very good performance. and they keep up doing their job.
I have a good stock of EDISWAN 6922 on hand, very musical easy sounding, but exemplary failure when used in the CAT.
The Siemens goldpins ARE not much around anymore...
my CAT is an mk 3.
i must confess i think about moving to Atma-Sphere MP-1.