Best 6922 tubes for Conrad-Johnson CT6 preamp


What would be the best sounding 6922 tubes for the CT6 Conrad-Johnson preamp ?
The unit came with Electoharmonix tubes, which I think lack in the low end. I replaced them with the Sovtek ones and I have a much better low end now (but along came microphonics..)
Has anyone tried any other 6922 tubes that give a better sound ?
gbel78
Looks like my other post didn't come through, which was that I run Ameperex white label PQ's in my CT6. They're pricy but worth the money IMO. I've tried both EH and Sovtek which are dull and lifeless in comparrison.
I also ended up with the white label PQs and in my CAT amp sound like a very significant improvement over the Sovteks they replaced, but you must have reason to trust your sources as a noisy great tube brand is much worse than a good measuring and quiet Sovtek. If noise is your primary concern, I would proabably get a super low noise graded tube from RAM; NOS is becoming more of a crapshoot as supply dwindles - but if Andy says he has some that measure well, I think you can count on it.
CJ preamps are known for being hard on their tubes.The best choice is usually going back to CJ.Had a friend buy NOS tubes for his Premier unit,all went south in the 1st week.Ended up going back to CJ and the cost was about the same as running NOS.Just a thought.