Fender Tremolux Blackface Head (Vintage) Production years 1963 -1966 blackface circuits AA763 Tube layout AA763 Tube layout (Seen from behind, V1 is to the right side) V1 12ax7 = Preamp normal channel V2 12ax7 = Preamp vibrato channel V3 12ax7 = Vibrato tube V4 12at7 = Phase inverter V5 GZ34 = Rectifier tube V6 6L6 = Power tube #2 [...]