This object is an example of a piece of electronic equipment built (probably in the early 1960s) specifically for audio synthesis. It is custom built, possibly by Tristram Cary and was used in his early studios established in London in the mid-1960s. It has a unique organisation of components, some off the shelf, some hand built, and was clearly modified as required during its useful lifetime. It may have been used in the construction of sounds for the Daleks in early episodes of the BBC's ground breaking science fiction series Dr. Who. It would certainly have been used in much of Cary's electronic music and continued to be incorporated into the studio in Adelaide up to his death. It still bears traces of chinagraph pencil marks noting the settings of some of its controls.
It comes from a very early version of Tristram Cary's studio. Photographs of the Fressingfield, Suffolk, studio in the UK, about 1969, show it mounted in a rack above one of Cary's tape recorders. The 'ring modulator' remains in later photographs with the VCS3's mounted in the place of the tape recorder.