Don Sach's pre amp

Since the website does not list specs, I have a question. Is Don's preamp using cathode-followers for the 6SN7 gain stage?

Also, if this is a single gain stage, is it sensitive to microphonic tubes? I assume you are all testing for low- noise?

I'm considering the Sach's Custom preamp. I love the use of 6SN7's in the gain stage. The one thing I'm wondering is the use of a cathode-follower is like a double-edged sword; low noise and distortion, but this design usually has a modern tube sound; extended highs and a lack of warmth.
I like transparency and open sonics, but I've owned preamps that sounded similar to solid state. I don't like the dark "syrup" tube sound, but want a preamp that presents tube bloom.

Any comments on this by Sachs owners? I'm using an EL34 push-pull amp.