Just curious Schubert have you listen to the new Gold Lions? 12ax7's?
I have RCA Mullard's Fisher branded Telefunken's and sound tested them against new Gold Lion's and found the Gold Lion's excellent.
Now that was new Gold Lions and I am not saying new tubes last as long as vintage tubes they might not? Part of the reason to try a new tube was to not wear out those priceless old tubes. I still have lots of them and they might go back in for a retest!
I have RCA Mullard's Fisher branded Telefunken's and sound tested them against new Gold Lion's and found the Gold Lion's excellent.
Now that was new Gold Lions and I am not saying new tubes last as long as vintage tubes they might not? Part of the reason to try a new tube was to not wear out those priceless old tubes. I still have lots of them and they might go back in for a retest!