Wiring schema - first generation AC100 SDL speaker cabinets
August to November 1964
The wiring schema for standard AC100 SDL (Super de Luxe) speaker cabinets can be found here.
Below, the schema printed by Jim Elyea of the AC100 SDL speaker cabinet (with basket top trolley) from November 1964 that was paired with AC100 serial number from early on - see this page.
Wiring schema of the AC100 SDL speaker cabinet (with basket-top trolley) from November 1964 (currently in the USA).
The pairs of capacitors, which protect the Goodmans Midax horns from potentially damaging low frequencies, are all mounted in the lower compartment.
The capacitors are paper in oil, 1uf (1mfd), 500v, the pairs wired in parallel for a total of 2uf.
The XLR socket is mounted on the bottom backboard. Five (six at most) cabinets were produced with this first schema of wiring - two issued to the Beatles, two reserved by JMI for loans and demonstration, and the one (certainly) made at some point November 1964 and paired with serial number 225.
Detail from a photo of one the SDL cabs issued to the Beatles, XLR socket on the bottom backboard, both pairs of capacitors in the foot of the cab.
Detail of the surviving fifth cabinet, paired with AC100 serial number 225.
The second wiring scheme, used in immediately subsequent cabs, is entirely different. , one pair of capacitors mounted in each of the two compartments. A schema can be found on this page.