The first series EB3 schematic applies to all EB3s from 1961 until late 1971. It would seem that this circuit was discontinued with the introduction of the maple-necked solid headstock EBs, although there may have been some overlap towards the end of the production run. In general series 1 circuitry can be identified by the large rectangular metal choke, as opposed to the smaller black cylindrical choke - identical to the one employed on the Ripper, and old-style ceramic capacitors. Pots used were three 500K audio taper (both volume pots and bridge pickup tone initially part CBA-811-1053, later CBA-811-1158 or 70027) and one 250K audio taper pot for the neck pickup tone (Gibson part number CBA-811-1831, later 70021).
