I have tried Telefunken CCa's, Telefunken 6DJ8's (ECC88), Amperex 6DJ8's, Mullard 6DJ8's, Telefunken 6922's (E88CC), Telefunken 7308's (E188CC) as well as Telefunken and Tungsram versions of 12AX7 in my CAT Ultimate. I don't think that anyone can tell you very much about what will work in your system unless they have every piece of equipment you have. I recently made a change in speakers from Snell C/V to Vandersteen 3A Signature, a change which one wouldn't expect to be huge, since both speakers are on the warmish side. The difference was huge and forced me to completely reevaluate all the interconnects and cables which I was using PLUS the tubes in the preamp. Tubes that I was going to sell before now sounded excellent and the tubes which I was using had to be reconsidered. The only way is to listen yourself with at least the speakers and preamp you intend to use and then to make your own decisions.
6922 tube rolling recommendations
I've been tube rolling tubes in my Bel Canto SEP-1 preamp.
I've gone from Sovteks to Jan NOS to Mullard(1970's version I think....$35/ea from Triode Elec) The Mullards sound much better...quieter background, better top end extension...it's really sparked my curiosity about trying other NOS tubes. I see VTS selling various Telefunken, Siemens, Amperex, and other older Mullards. Can anyone recommend a good step up from my current Mullard gold pins?
I've gone from Sovteks to Jan NOS to Mullard(1970's version I think....$35/ea from Triode Elec) The Mullards sound much better...quieter background, better top end extension...it's really sparked my curiosity about trying other NOS tubes. I see VTS selling various Telefunken, Siemens, Amperex, and other older Mullards. Can anyone recommend a good step up from my current Mullard gold pins?