Tube rolling is never ending quest, you’d better look and read an Tube Asylum site. You tube (ECC83 /12AX7) is slightly different from mine (ECC81 /12AT7), i ended up with NOS Sylvania Gold Brand (Gold Pins), Matsushita, military Telefunken are the most expensive...
Sylvania was the best value for me.
You can always look for RCA
Avoid Chinese tubes, in general Russian military grade are not bad if they are very cheap, but you’d better look for NOS from the 50s 60s 70s.
If (ECC81 /12AT7) are compatible for your phono pre you can ask me, i have some NOS
Sylvania was the best value for me.
You can always look for RCA
Avoid Chinese tubes, in general Russian military grade are not bad if they are very cheap, but you’d better look for NOS from the 50s 60s 70s.
If (ECC81 /12AT7) are compatible for your phono pre you can ask me, i have some NOS