Check out Tubes4hifi.com also known as VTA (Valve Tube Audio)
http://www.tubes4hifi.com/SP14.htm
I just purchased the SP13 (assembled version) and can’t say enough how good the build and SQ are. Roy, the owner, can assemble it for you or you can purchase as a kit and build it yourself. He responds to email inquiries quickly and follows up after your delivery to make sure the preamp is meeting your expectations and believe me, it will exceed them.
Check out the reviews, not a single negative review as well as you don’t see many, if any on the resale market. These are keepers and I’m sure Roy could accommodate your needs. Like I said, check the user reviews and forums and you’ll find nothing but happy owners.