In my VAC MkVI Renaissance the OEM Electro Harmonix tubes got replaced with 6922 Refector’s. The resulting sound was more pleasing to my ears.
VAC Pre-amp to roll or not to tube roll...
I've been running my VAC Sig MK IIa for about 10 years, I'd estimate 11k--12k hour (yeah I do play it a bit). While I have had to replace the line stage 6DJ8's, one when craze microphonic, the original 12AX7's are still working. I still have a new set of stock Chinese no-name 12AX&'s from VAC I bought when I bought the pre-amp but of course I have been wondering "What-IF I tried a different set of tubes..."
Any suggestions, inputs? Gold Lion, Mullard, or stick with the no-names?