1987 Yamaha RBX5 5 String Active EQ Bass Guitar (w/ OHSC)1987 Yamaha RBX5 5 String Active EQ Bass Guitar (w OHSC) Made in Yamaha's Taiwanese factory in the late 1980s, the RBX5 is part of the RBX family of basses first introduced in 1987 as a modern, heavily contoured series of instruments equipped with active or passive pickups, as well as a range of colour, fret and pickup configurations. Best described as a 4 string bass with an added lower string, the RBX5 retains a regular scale and size neck with