The Model 15 is an ultra-powerful, compact studio synthesizer designed for live performance and portability. It is housed in a rugged tolex-encased cabinet and is an ideal solution for the touring synthesist. The Model 15 design focuses on speed, creativity and simplicity while still providing the enormous sonic depth and dimension found only in a vintage Moog modular synthesizer.
FAITHFULLY RECREATING THE MODEL 15
Over the course of 3 years, Moog Music set out to research and build a faithful recreation of the classic Moog modular Model 15 analog synthesizer. Using all original documentation as well as circuit board and art files for every module, Moog Engineers have painstakingly recreated this powerful and portable analog system.
Each Model 15 is hand-built to its original 1974 Moog factory specifications and is a true recreation of the original. Individual modules are brought to life just as the originals were, by hand-stuffing and hand-soldering components to circuit boards, and using traditional wiring methods. Each module is then finished with a photo-etched aluminum panel, and placed in its new modular instrument.
Model 15 Modules
2x 902 Voltage Controlled Amplifiers
1x 904A Voltage Controlled Low Pass Filter
1x 907A Fixed Filter Bank
2x 911 Envelope Generators
1x 921 Voltage Controlled Oscillator
1x 921A Oscillator driver
2x 921B Oscillators
1x 923 Random Noise/Filter
1x 995 Attenuator
1x CP15 Console Panel
1x 130 Watt 120 VAC Power Supply (230 VAC available upon request)
Included Cabling
10x - 1' 1/4" TS cables
18x - 2' 1/4" TS cables
2x - 1' S-Trigger cables
1x - 1.5' S-Trigger cable
1x - 'Y-cable' S-Trigger
Weight: 50 lbs.
Dimensions: 18" wide x 25" high x 9 1⁄2" deep
System 15 Modules And Their Original "Functional Descriptions"
902 Voltage Controlled Amplifier: The 902 voltage Controlled Amplifier is a differential input and output circuit which gives an overall voltage gain of 2 {6dB} when the manual control potentiometer is at maximum {6}, or when a control voltage of 6 volts is applied to the control input. Maximum sum of control voltage {fixed control voltage and input jacks} is approximately 7.5 control volts, producing +4.7dB or gain of 3. Two modes of gain response are available: linear
and exponential.
904A Voltage Controlled Low Pass Filter: The 904A Low Pass Filter attenuates frequencies above the fixed control voltage cutoff point at a rate of 24dB per octave. The cutoff point {cutoff frequency} is voltage controlled through the control input jacks. The sum of the applied control voltages doubles the frequency of the cutoff point for each one-volt increase {volt per octave standardization}. The regeneration potentiometer {variable Q} varies the amount of internal
feedback, creating a resonant peak at the cutoff frequency. This resonant peak will break into oscillation at clockwise settings of the regeneration pot, creating a voltage controlled sine wave generator. The fixed control voltage pot covers a 12-volt {octave} range. The overall range of the FCV pot is determined by the Frequency Range switch, which moves the frequency cutoff range in two-octave steps.
The basic cutoff frequency of the Low Pass Filter is determined by the
combination of fixed control voltage and frequency range in addition to
the control input signals. An increase in regeneration narrows and
increases the strength of the cutoff frequency peak, while decreasing
the amplitude of the lower frequencies. 904B Voltage Controlled High
Pass Filter: The 904B Voltage Controlled High Pass Filter attenuates
input signal frequencies below its nominal cutoff frequency setting.
The attenuation below FCV cutoff setting is 24dB/oct. As the
fundamental is generally the loudest frequency component of a complex
tone, deletion of the lowest frequency range can radically alter the
timbre. The FCV cutoff point is raised or lowered in octave per volt
control inputs. The Frequency Range switch sets the overall range of
frequencies covered by the Fixed Control Voltage potentiometer. The Low
range encompasses 4hz to 20kHz, while the High range shifts 1 1/2
octaves up to 10Hz through 50kHz.
907A Fixed Filter Bank: The 907A Fixed Filter Bank is a
non-voltage controlled modifier, which emphasizes or reduces the gain
of the center frequency bands indicated on each of the eight center
pots, in addition to the cutoff points set by low pass and high pass
filters at either frequency extreme. A total of 10 overlapping LC
networks are included.911 Envelope Generators: At the introduction of a
switch-to-ground {S-trigger} trigger signal from an external source,
the 911 Envelope Generator produces a single voltage contour whose
time/voltage variation is determined by potentiometers T1, T2, T3 and a
time constant sustaining level pot {Esus}. Closure of the input trigger
switch directs the voltage contour to T3 {final decay} regardless of
what stage { T1, T2 or E} was in current operation. The Envelope
Generator requires an S-trigger to operate. External sources must be
converted to the S-trigger format via the 961 Interface.
911 Envelope Generators: At the introduction of a
switch-to-ground {S-trigger} trigger signal from an external source,
the 911 Envelope Generator produces a single voltage contour whose
time/voltage variation is determined by potentiometers T1, T2, T3 and a
time constant sustaining level pot {Esus}. Closure of the input trigger
switch directs the voltage contour to T3 {final decay} regardless of
what stage { T1, T2 or E} was in current operation. The Envelope
Generator requires an S-trigger to operate. External sources must be
converted to the S-trigger format.
921 Voltage Controlled Oscillator: The 921 Voltage Controlled
Oscillator is a variable waveform generator, which produces frequencies
ranging from .01Hz to 40kHz. Four waveforms are available: Sine,
Triangular, Sawtooth, and Rectangular {with variable duty cycle}. Both
fixed and variable levels can be obtained from front panel output
jacks. Nominal frequency is set manually by the scale, coarse range,
frequency and {octave} range controls found at the top of the module.
Voltage controlled rectangular width is set by the knob in the upper
center {left}, with accompanying voltage input jacks. Clamping point
{waveform reset control} may be set with the lower left knob and
accompanying trigger inputs to the left. Multiple frequency control
inputs can be plugged into this module in parallel. All waveform
outputs can be used concurrently if desired.
All manual controls on this module can be moved or switched during
operation. This module functions as both an audio or control voltage
generator.
921A Oscillator Drivers: The 921A Oscillator Driver is a
control voltage processor, which drives associated 921B oscillators
through internally wired connections {via edge connectors}. Two
voltages are generated: one for frequency control and one for
rectangular wave duty cycle. Control inputs to this module change the
frequency of its associated oscillators in volt/octave increments.
Manual adjustment to the Frequency and Width Of Rectangular Wave pots
changes the nominal frequency and duty cycle of all connected 921B's in
parallel. Two ranges are provided on the Frequency potentiometer:
semitone {two octaves compass} and octave {12 octaves compass} These
ranges are selected by the white switch below the Frequency
potentiometer. Control inputs for frequency and rectangular width are
summing.
921B Oscillators: The 921B Oscillator generates frequencies from
1Hz to 40kHz minimum. They are wired in groups to a common 921A
Oscillator Driver, which provides both exponential frequency control
and rectangular width voltage control. Like the 921 Oscillator, this is
one of the building blocks of analog synthesis. This oscillator
generates both sub-audio and audio frequencies for control and audio
signal use. The Frequency pot at the top of the module has a two-octave
range for fine-tuning, while the Range switch shifts the frequency of
the oscillator in octaves, up or down. Number indications on the Range
switch correspond to traditional organ pipe range notations. Fixed
level outputs for Sine, Triangle, Sawtooth and Rectangular waveforms
are found at the right of the modules. DC Modulate is a linear
frequency control input {does not conform to 1 volt/octave control
voltage format}. AC Modulate input is a capacitor-coupled circuit like
the DC Modulate input, however, blocking constant DC voltages.
921B Oscillators may be phase locked together via the Synch input jack
and the associated three position Synch Switch. Phase locking
capability is generally limited to the first six harmonics of the input
signal. A sawtooth waveform is recommended for best synchronization
results.
923 Random Noise/Filter: The White and Pink noise outputs of the
923 Random Noise/Filter module produces continuous bursts of random
frequencies and waveshape throughout the audio spectrum. Pink noise
displays equal amplitude/energy per octave. A resultant lower
frequency concentration for Pink Noise marks the difference between the
two outputs, with white noise appearing in even intensity throughout
the audio spectrum. Parallel outputs are provided for both noise
sources. The two manual sweep filters, Low Pass and High Pass, are
single pole {RC} circuits with a frequency cutoff slope of 6dB per
octave.
995 Attenuator: Attenuators reduce the gain or amplitude of any
applied input signal, control or audio. Moving clockwise from zero gain
to unity with input, these attenuators can be used for reducing the
effect of a control upon a voltage controlled module, providing up to
three variable outputs from a single source input or reducing the gain
of an entire signal complex.
CP15 Console Panel: Specifications to be provided
