MATRIXSYNTH: EMS Synthi E - The Educational Modular Synthesiser (1975) Serial # 194 7137


Tuesday, July 17, 2018

EMS Synthi E - The Educational Modular Synthesiser (1975) Serial # 194 7137

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"Such a great little compact modular synthesiser that can really surprise with its heavy bass growl. Ive destroyed sound systems at venues performing with this thing.

“Versatile and Robust” as the manual states… You have to hand it to the people at EMS they really knew how to design synths. This one has all the features you need to perform with just this alone and bring the house down, its sliding controls are smooth and intuitive, its internal touch ribbon controller is super fun and you can plug external gear (guitar, voice, drums into the Envelope Follower) to control any or many parameters. The Synthi E was designed for schools and colleges back when education held humanities in high regard, imagine being exposed to modular synthesis as a high school student?!?

A tight little package wrapped in an original Spartanite case which alone is extremely sort after and valuable.

Did I mention that it is battery operated as well? Yes, so you can take it into woods and jam out to nature sounds, set up a mic and your Synthi will play along with the birds. For studio sessions it can be connected to a 12volt DC power source so you can play all night long.

It also comes with and extremely rare 3-octave external keyboard with silky smooth action if you wanted to play it in a more conventional manner. Ive never seen one of these for sale, ever so I doubt there are many out there. Serial # 7137

It has quite a good internal speaker that really represents well considering its size. Comes with many custom made stackable patch cables and cables to interface with your other gear.

MAIN FEATURES INCLUDE:
* Input Amplifier with low (Microphone) and high (line) level inputs.
* Envelope Follower providing a voltage proportional to the amplitude of the input.
* Oscillator 1 with true exponential voltage control of frequency and three simultaneous output waveforms (sine, triangle and voltage controlled pulse)
* Oscillator 2 for slow control voltages such as glissando or vibrato.
* Filter/Oscillator 3 with v.c. low, high and band pass filter or pure sine wave.
* Modulator for envelope shaping or ring modulation. Noise Generator.
* Trapezoid Generator for multiple simultaneous trapezoid waveforms. These may be used for envelope shaping (trigger mode) or for low frequency waveforms (free run mode).
* Manual-Slide tape Controllers (2) for obtaining control voltages. One slide-tape is stepped and may be used as a keyboard and the other for variable control. One provides a trigger pulse. Both may be temporarily marked or written on.
* Inverter to invert control voltages or signals.
* Monitor Amplifier and Loudspeaker with two input mixer faders.

GENERAL:
Signal level at patch nodes: 3v P-P.
Output impedances at patch nodes: 100 ohm average.
Input impedances at patch nodes: 25 kohm average.
All inputs and outputs are protected against short circuits to each other or to ground.
IN PUTS: High level input level: 2.2 v P-P nom. 10v P-P clipping. 180 kohm impedance. Direct inputs: DIN connections 2—Ground 1 inputs
Low level input level: 200 mV P-P nom. Overhead: 14 dB
50 kohm impedance.
Envelope follower output proportional to input over dynamic range of: 40 dB. V.C.O. — VOLTAGE CONTROLLED OSCILLATOR:
Total frequency coverage: 1 Hz to 10KHz.
Sine wave distortion: 5% THD (TYP)
Triangle symmetry (rise and fall): 3% at 1 KHz.
Rectangular wave mark space ratio voltage control range: 0 to 100%.
Deviation of voltage control of frequency from ideal exponential law
Over musical range 100Hz—2KHz: .8% (B.S.L.)
Over audio range 10Hz — 10KHz: 1.7% (B.S.L.) General short term stability. Drift at 1 KHz: 2% per hour.
OSCILLATO R (VIBRATO/TREMOLO): Manual control of frequency: 0.01 Hz —15Hz.
Manual control of amplitude: 1000:1.
V.C.F. — VOLTAGE CONTROLLED FILTER (Band pass, low pass, high pass):
Frequency range: 10Hz-10KHz.
Distortion (oscillating mode musical range): 2%.
Deviation of voltage control of frequency from ideal exponential law over complete range: 2% (B.S.L.)
Minimum 'Q': 2.
Maximum finite 'Q' over musical range: 30.
TRAPEZOID GENERATOR: (All outputs)
Minimum transition time: 20 mS.
Maximum transition time: 5S.
As oscillator — frequency range: 1—25 Hz.
NOISE SOURCE:
Spectral flatness over musical range: +6 dB.
KEYBOARDS:
Slider tape Track and hold droop .02% of fullscale per second.
Chromatic keyboard Track and hold droop: .01 % of fullscale per second.
Differential step Linearity (ratio of smallest or largest to average): 95 %.
INVERTER: Voltage gain—1: + 2%.
MIXER: Fader control range: 50 dB min.
Tone control (treble lift/cut) Corner frequency: 500 Hz.
Max. change at 10KHz: 30 dB.
MONITOR: DIN pin connections. 2—ground.
3 monitor output
V.C.A. — VOLTAGE CONTROLLED AMPLIFIER:
As ring modulator
Carrier suppression: 30 dB. Signal suppression: 40 dB.
As envelope modulator Off breakthrough:—60 dB. On level distortion: 5 %.
MONITOR AMPLIFIER:
Power delivered to internal loudspeaker: 500 mw.
Output to external amplifier, tape recorder or oscilloscope (two outputs provided).
Minimum recommended load: 600 ohms.
Output impedance: 50 ohms max.
Maximum output voltage into 10K load: 7v P-P.
BATTERIES:
12 x Ever Ready U2 (1 .5V). An external mains power supply can be provided.
Battery life: Using 2 hour daily sessions and external monitor: 100 hours.
DIMENSIONS: 50 x 40 x 10 cm.
WEIGHT: 7 kg.
DKE KEYBOARD:
A 3-octave keyboard for controlling the Synthi E is available. This unit is a mechanical keyboard which plugs into the Synthi E. It provides the correct pitch voltage and trigger signal for the Trapezoid Generator. A switch on the Synthi E selects internal or external keyboard operation."

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