@audiojan Thanks everyone. I have a bunch of tubes incoming. Radiotechnique, Genalex Gold Lion, Brimar, Amperex.
That's the way to do it. Do some nice pair comparisons, select a few vintage you like, and a few new/re-issue tubes to play when you like. Then store off the keepers and sell off the stuff that's just okay or does not gel well with your system so much.