EMS Synthi 100 (1971)
A rare, large-format analog/digital hybrid modular synthesizer developed by Electronic Music Studios, known for its use in experimental and broadcast sound design.
Overview
The EMS Synthi 100 is a modular analog/digital hybrid synthesizer built by Electronic Music Studios (EMS) in London. Introduced in January 1971, it was originally commissioned as a custom order for Radio Belgrade. Fewer than forty units were built and sold, making it one of the rarest EMS instruments. Known for its massive size and complex architecture, it was used by pioneers like Karlheinz Stockhausen and Francis Monkman. The system features a pin matrix patching system, with the right-hand matrix dedicated to control voltages. It has been described as a "mythical musical instrument" and a "wonderful noise machine" — cult status among modular synth enthusiasts.
Specifications
| Product type | Modular analog synthesizer |
| Architecture | Analog/digital hybrid |
| Manual Frequency Range | Greater than 1 Hz to 10 KHz |
| Triangle Symmetry | ±5 |
| Components | Four Voltage Controlled Filter/Oscillators, two envelope followers, oscilloscope, digital frequency meter |
| Patching | Pin matrix |
| Additional features | Spring reverb, octave filter bank, input amplifiers, send/return, illuminated working surfaces |
Design
The Synthi 100 uses a hybrid analog/digital design with a pin matrix for signal routing. The patching matrices are located on the main desk, with the right-hand matrix specifically for control voltages. It includes four Voltage Controlled Filter/Oscillators and integrates both analog synthesis modules and digital control elements. The working surfaces are illuminated, and the system includes built-in monitoring tools such as an oscilloscope and digital frequency meter.
Context
The Synthi 100 was developed as a custom system for Radio Belgrade and launched publicly in 1971. It followed earlier EMS modular systems and was positioned as a high-end, large-scale instrument for studios and institutions. Its complexity and scale distinguished it from more portable EMS models. The instrument was used in experimental music and sound design, including work associated with BBC's *Doctor Who*, earning it the nickname "the dr.who monster synth."
Market
Fewer than forty units were ever built, contributing to its extreme rarity. It has been described as "so rare, it will break your bank" and "a mythical musical instrument." While listed occasionally on eBay and forums, no verified sale prices are documented in the research. One 1974 unit was described as being in "incredible condition" by its second owner, indicating long-term ownership and preservation.
eBay Listings
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