The 5751 Blackplates are excellent premium tubes, very dynamic.
For a more relaxed, classic sound from the same family of tubes is the RCA 12AX7 Blackplate.
The Blackplates have a very open sound.
I would also recommend Mullard Longplates, but tube rolling with Mullards can get very expensive.
For a more relaxed, classic sound from the same family of tubes is the RCA 12AX7 Blackplate.
The Blackplates have a very open sound.
I would also recommend Mullard Longplates, but tube rolling with Mullards can get very expensive.