7308 where offered Valvo I belive as a factory upgrade.
The 7308 family of tubes is a premium build of that family 6DJ8 6922.
NOS 7308 will out perform most 6922 and 6DJ8.Maybee not all but the build specs are much better in the 7308 tube.
I had an Anthem CD-1 that went from good to very good to great.
6922 to start Valvo 7308 then to an Amprex 7308.
The 7308 family of tubes is a premium build of that family 6DJ8 6922.
NOS 7308 will out perform most 6922 and 6DJ8.Maybee not all but the build specs are much better in the 7308 tube.
I had an Anthem CD-1 that went from good to very good to great.
6922 to start Valvo 7308 then to an Amprex 7308.