Turbopay, I was asking the same question a short while ago. I was using a ss preamp with the 4bst and I felt something was missing. The replies to my question were coming back "GO WITH TUBES". Quite a few prefered the Conrad Johnson and Cary over Audio Research.Some like the sound of a 6SN7 tube over the 6922 tube. Not having the cash on hand for a Cary, I looked at AES ( Audio Electronic Supply)which is owned by Cary. I bought the AE-3 used for $400 and this little charm sings. It has point to point wiring so you can tinker with its inerts for the sound you desire. I never imagined that my system could sound so great with a tube preamp.
Kek
Kek