Equipment

Vox Continental

John Cale used this instrument on Sun Blindness Music. From Wikipedia:

The organ's sound comes from twelve oscillators, one for each note in the chromatic scale along the top octave of the instrument. The signal from each of these is fed into a frequency divider circuit that allows the frequency to be halved, in order to produce the sound an octave lower. This is then halved again for the subsequent octave, and so on down the rest of the instrument's range, except for the lowest note, C, which has a dedicated generator. Each key is connected to four contacts connected to ground; when a key is pressed, it makes a connection to the bus bar which sends a signal to the drawbars to produce a sound.