I use a Foz V2.
Like everything audio, the tube/cable tweaks are a subjective, YMMV thing.
The manual states V3 makes the most sonic change. After trying tubes in the other positions, I too agree it's the only position worth experimenting with.
Whatever change the other positions offered,it was too subtle to bother with. I'm more concerned with tubes being as quite as possible.
Clean power(PS Audio Power Plant) and decent power cable are more of an improvement in my situation.
Like everything audio, the tube/cable tweaks are a subjective, YMMV thing.
The manual states V3 makes the most sonic change. After trying tubes in the other positions, I too agree it's the only position worth experimenting with.
Whatever change the other positions offered,it was too subtle to bother with. I'm more concerned with tubes being as quite as possible.
Clean power(PS Audio Power Plant) and decent power cable are more of an improvement in my situation.