Rickenbacker 4001S

A 1977 Rickenbacker 4001
Manufacturer	Rickenbacker
Period	1961–1981
Body type	Solid
Neck joint	Bound or unbound maple (4001S model)
Scale	33 (medium scale) or 30​1⁄2 (Short-scale version)
Body	Bound maple and unbound maple (4001S Model)
Neck	Maple and Walnut
Fretboard	Ebony, Rosewood
Pickup(s)	2 single coil/horseshoe
Fireglo (Cherry Sunburst), Autumnglo (Tobacco Sunburst), Burgundyglo (Red), Jetglo (black), Mapleglo (natural)and Azureglo (blue)

The Rickenbacker 4001 is a bass guitar that was manufactured by Rickenbacker as a two-pickup "deluxe" version of their first production bass, the single-pickup model 4000. This famed design was manufactured between 1961 and 1981, when it was replaced by an updated version dubbed the Rickenbacker 4003. Variant models of the 4001 include the 4001S, 4001LH, 1999 (European model), 4001V63 (reissue), 4001CS (a limited edition series based on Chris Squire’s 1965 British model RM1999) and the 4001C64S C Series, a recreation of Paul McCartney's left-handed 4001S with a reversed . There is also a Lemmy Kilmister signature version (4004LK) of the instrument.

The iconic upper bout and headstock silhouettes of the Rickenbacker 4001 are the most salient characteristics of the "crested-wave" body shape designed by luthier Roger Rossmeisl for Rickenbacker's model 4000. The 4001 model features a neck-through construction, a full-wood body, fretboard with metal strings (originally flat-wound, though many players replaced them with round-wounds), twin truss rods, triangle inlays, two pickups, two volume and two tone dials, selector switch, and wiring for Rick-O-Sound (standard in models post-1971). Rickenbacker also produced six-string and 12 string guitars and a short-scale bass, the 3000 model.

The 4001S (and 1999) model varies in its use of dot inlays, and unbound neck construction. The Rickenbacker 4003, which replaced the 4001, differs in the truss rod design and introduces a fret wire that better withstands the wear from round-wound strings. Fast fret wear was a common complaint for many years, and Rickenbacker sought to address the issue. Other features remained similar to its forebearer.