ETI 4600 Technical Info
     

 

Specifications:
     

  Oscillators

 
 
Type Voltage-Controlled (VCO)
Number of Oscillators 4
Voltage Input Range 0 to +15 volts
Waveform Outputs Sine, Triangular, Sawtooth, Inverted Sawtooth, Square (with variable mark/space ratio)
Controls:  
Range 8 switchable ranges (ฝ’ to 32’ plus ‘low’ frequency 0.01Hz for special effects)
Tune Tuning range of ฑ ฝ octave
Free Run Manually adjusts oscillator over full range
Shape Varies mark/space ratio of square wave output
Waveform Sine, Triangular, Sawtooth, Inverted Sawtooth, Square. (Oscillator 4 has a dual output with additional noise or controller output)

 

  Keyboard

 
Type Monophonic
Size 48 note F – E

 

  Keyboard Controller

 
 
Analogue Output 0 to +5 volts (direct output)
  0 to +15 volts (modulated output)
Trigger Output -7 volts to +7 volts transition when a key is pressed. Inhibited if more than 1 key is pressed
Inputs Transient generator 2
  Modulation Input

Controls:

 
KB Sweep Allows manual sweep up or down over any selected span from the keyed note
Glide

Provides a glide between notes. 0 to 10 seconds switchable

Transient Selects direct modulation of keyboard by transient generator 2
Tune Tunes keyboard by ฑ 2 semitones

 

  Noise Generator

 
 
Output White or Pink noise (selectable). Noise can also be selected from Oscillator 4
  White noise – up to 15kHz
  Pink noise – cut off frequency is 500Hz with a 6dB/octave slope

 

  Controller

 
 

Controls:

 
Modulation Controls level of modulation
Level Sets the DC level i.e. the centre frequency of controlled oscillator

 

  Mixers (1,2 and 3)

 
 
Number of mixers 3

Controls:

 
Inputs 5 inputs per mixer (one from each oscillator), each with independent level controls
Level Adjusts output level from each mixer. Overload indication by red LED

 

  Mixers (4 and 5)

 
 
Number of mixers 2

Controls:

 
Inputs inputs per mixer, each with independent level controls
Level Adjusts output level from each mixer. Overload indication by red LED

 

  Filters

 
 
Type Active Voltage-Controlled Filter (VCF)
Number of Filters 2
Input Range (signal)   0 to +5 volts
  (control) 0 to +5 volts
Cutoff Rate 24dB/octave

Control Range

2 decades
Controls:  
Filter Mode Selects High Pass (HP), Band Pass (BP), or Low Pass (LP) characteristics
High / Low Selects tuning range
Tune Tunes filter to control source
Level Adjusts output level from filter. Overload indication by red LED

 

  Amplifiers

 
 
Type Voltage-Controlled Amplifier (VCA), AC or DC coupled
Number of Amplifiers 2
Input Range (signal)   0 to +5 volts
  (control) 0 to +5 volts

Controls:

 
Mode  

Ring Modulation (R.M.) AC coupled - functions as a ring modulator. Amp. DC coupled – functions as a voltage-controlled amplifier (VCA)

Level Adjusts output level from amplifier. Overload indication by red LED

 

  Envelope Control

 
 
Type Transient Generator incorporating a Voltage Controller Amplifier (VCA)
Input (Signal) 0 to +5 volts

Output

(Signal) 0 to +5 volts
Controls:  
Trigger Input Selectable – either from keyboard controller, or from external source
Attack Selects the attack time – adjustable from 5msec to 5sec
Decay 1 Selects the decay time - adjustable from 5msec to 5sec
Hold Level Selects the hold level – adjustable from 0 to +5 volts
Delay Selects delay time – adjustable from 5msec to 5sec. In the off position, delay duration is set to key contact time
Decay 2 Selects the decay time - adjustable from 5msec to 5sec
Control Mode Linear or Exponential VCA with a range of 60dB

 

  Transient Generator 1

 
 

Controls:

 
Trigger Input Selectable – either from keyboard controller, or from external source
Attack Selects the attack time – adjustable from 5msec to 5sec
Decay 1 Selects the decay time - adjustable from 5msec to 5sec
Hold Level Selects the hold level – adjustable from 0 to +5 volts. When ‘key’ is selected, hold level is determined by corresponding key voltage from keyboard controller
Delay Selects the delay time – adjustable from 5msec to 5sec. In the ‘off’ position, delay duration is set to key-on time
Decay 2 Selects the decay time - adjustable from 5msec to 5sec
Output 0 to +5 volts

 

  Transient Generator 2

 
 

Controls:

 
Trigger Input Selectable – either from keyboard controller, or from external source
Start Level Selects start level – adjustable from 0 to +5 volts
Delay 1 Selects the initial delay time – adjustable from 5msec to 5sec
Slope 1 Selects the first slope – adjustable from 5msec to 5sec
Hold Level Selects the hold level – adjustable from 0 to +5 volts
Hold Delay

Selects the delay time – adjustable from 5msec to 5sec. In the ‘off’ position, delay duration is set to key-on time

Slope 2 Selects the second slope – adjustable from 5msec to 5sec
Final Level Selects the final level – adjustable from 0 to +5 volts
Output 0 to +5 volts to patchboard and to keyboard controller

 

  Exponential Converter

 
 
Function Converts linear input to an exponential output
Input 0 to +5 volts
Output 0 to +5 volts

 

  Joystick

 
 
Type 2-axis of any two functions, linear or exponential output as required
Output 0 to +5 volts

 

  External Input Module

 
 
Inputs 2
Sensitivity 50mV to 2V (high / low switchable)
Input Impedance 10kΩ
Frequency Response 20Hz – 50kHz  ฑ3dB
Trigger Output -6 volts to +6 volts transition when the signal level of EXT INPUT 1 exceeds the level set by the trigger level control

 

  Output Equalizer

 
 
Number of Stages 5
Centre Frequencies 60Hz, 160Hz, 500Hz, 1.5kHz, 5kHz
Type Active filter
Adjustment Range > ฑ10dB

 

  Reverberation Unit

 
 
Type Multi-spring type
Reverb time Short spring line – 2.5 sec
  Long spring line – 7 sec
Output Adjustable mix-fader from full reverb to original sound without reverb

 

  Phone Output

 
 
Power Output 1 Watt
Load Impedance 8Ω
Output Level Adjustable, with on-off switch

 

  Signal Output

 
 
Output 0 to 1V RMS
Load Impedance 1kΩ
Level Adjustable, with on-off switch

 

  Interconnection System

 
 
Type 484 point patchboard. Connections made by use of patch pins

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