@tonydennison
Just my take using them in 2 Amps, phono pre and a second DAC.
So many…so little time and $…Cheers!
12AX7
RCA ‘50-60’s long blackplates (fav)
Mullard 50’s-60’s long plates (close 2nd)
Sylvania ‘50-60’s long blackplates
Amperex 50-60’s long plates or early short plates with large O getter
Telefunken smooth or ribbed plates (less warm)
12AT7
Mullard ‘50’s square getter (fav but rare)
RCA and Raytheon 50-60’s black plates
Brimar 50-60’s Yellow(rare) or white T series
Tungsram or Telefunken (less warm)