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

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