The EMS Synthi 100 was a large analogue synthesizer made by Electronic Music Studios (London) Ltd. It was released in 1974 and cost $25,000. Around 30 units (29, according to some sources) were built during the 1970s and 1980s.
The Synthi 100 was developed from a combination of three VCS-3 Systems, ending up with 12 VCOs, two keyboards (each of it duophonic, making it possible to play 4 voices simultaneously), and a 3-track 256-step monophonic digital sequencer. Two 64 x 64 patchbays were used to connect the different modules.
via the Synthtopia Flickr Pool