You might give Don Sachs a call. He normally uses only one balanced In/Out pair but you can opt for more instead of RCA. For a pure tube pre it is very quiet and clean sounding not syrupy and rolled off. I purchased one just to play with and after a few months switching it in and out of my system sold both my ref-6SE and my PS-BHK to use only the Sachs which was a particularly good match to my system... that's the key, your mileage may vary. It's only ~$3k loaded up.
