Production years: 1964 -1967 “blackface” circuits AA763, AB763, AB868 (CBS) 1967 -1977 “silverface” circuits AB763, A1172 and A1270 1977-1979 “silverface” circuit with Push-pull volume boost. Tube layout AA763/AB763 Tube layout (Seen from behind, V1 is to the right side) V1 12ax7 … Continue reading BF/SF Deluxe Reverb