Tube selection

I am currently using Sovtek 12AX7WXT tubes in my preamp and CD player output stage. I like the full rich bass and midrange of the tubes but I feel the highs are lacking in air and frequency extension. I have tried the Mullard and Telefunken equivalents. The highs with respect to both of these tubes were superior to that of the Sovtek but the mids and bass of both tubes were much thinner than the Sovteks. Any suggestions with regards to any available tubes that combine the bass and mids of the Sovtek with the highs of the Mullard and Telefunken? Any help would be greatly appreciated.

Thanks,

Steve