Vox Supreme serial number 1133 - power section
The page on the amp's cabinet, with general introduction, can be found here. Details of the preamp are here.
Power section assembly serial number 01300. In terms of component date codes: the Welwyn resistor on the underchassis bias board has "YE" = May 1967; the RCA transistors (all are original) have "7E" = May '67; and the red CCL capacitors "7F" = June 1967 for their manufacture.
