Check out Linear Tube Audio. Might not be as good of a match as the Raven or Primaluna with the B&Ws tho. The B&Ws are on the crispier side of the spectrum and the Primaluna or Raven would be a wonderful pairing. That being said if you are looking for very revealing detailed sound, leaning ever so slightly towards the solid state spectrum the LTA is where to go. I have an LTA UltraLinear Integrated paired with my Moab’s and it’s wonderful. I tried Primaluna and also Lyngdorf with my Moab’s. The Lyngdorf was revealing but a little bright. The Primaluna was amazingly fun but a tad too much syrup I felt for my speakers. The LTA had best of both worlds. But my Tektons are definitely darker than B&Ws. As a wildcard check out Thomas’s review of the Willenston R8 Chinese Tube Integrated. Only $1,000 and supposed to be great. But you’d need to check on a return policy which it might not have.