I bought a Fosi Audio tube pre-amp about a week ago. Very impressed with it. However, as I have until the end of Jan to return it (I bought it off Amazon). Just intrigued if the Pro-Ject Box S2 would take the sound to another level? Any thoughts?
Why dont you order the Pro-ject as well and compare them, then send back the one you don't want. In theory the Project should be better.
I have a Fosi BT30D for my computer speakers, it's great.
I think you have the Chinese 6j1 tubes an upgrade would be JAN5654 tubes.
I might have some laying around in the music room, if I have got some I will let you have them.