Need some recommendations on Tube Preamps

I recently bought a pair of magnapan 1.6QR which are outstanding speakers. Although this may not have been beneficial for me but when I auditioned the system used was accompanied with a tube preamp. I currently have solid state Bryston BP20 and 3BST system. Sound is great but tube preamp was sweet sounding. My question is what would you folks recommend for a tube preamp paired up with a Bryston 3BST? My price range would be around $2000.00 and my listening pleasure is opera or classical! thanks