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The discrete transistor core of this Voltage Controlled Oscillator is an exact emulation of the original and now very rare R A Moog Model D Oscillator from 45 years ago, and the resulting waveforms and sounds are exactly as the original, as big, fat and sweet as ever!


It features front panel switchable octave selection and four independent waveform outputs including the famous “Sharktooth” wave, Sawtooth wave, Square wave and Triangle wave.


The Square wave output now has fully adjustable Pulse Width Modulation, with manual and CV control rather than the more restricting selection of two static fixed pulse widths or square wave of the original design.

We have added extra features too, including exponential and linear modulation inputs and two different types of oscillator sync which help to make this a very versatile Eurorack VCO in its own right.


Vintage Transistor Core VCO

£260

AJH Synth Logo AJH Mnimod VCO silver

Width
14HP

10HP

Depth
38mm

Current
95 mA

10HP

The stuff of legends, the Moog transistor ladder filter changed the face of the musical landscape forever. The MiniMod VCF is a faithful replica of the 24db/octave low pass filter used in the early Model D synthesiser.

There is a three channel input mixer and a nice large filter cutoff control, along with “1/3” and “2/3” CV inputs to emulate the action of the original VCF keyboard switches, apply 1v/oct to either of these inputs and the VCF keyboard tracking will be the same as the original with Keyboard 1 (1/3) or 2 (2/3) engaged, or use the 1v/oct input to emulate both switches selected. There is a variable Exponential CV input which is about 30% more sensitive than the 1v/oct input, this allows some nice over modulation effects.

We have added Voltage Controlled Resonance (Emphasis) in addition to manual Emphasis control. This uses a vactrol as the control element. The fast vactrol used allows modulation speeds up into the audio range. The filter will of course self resonate and act as a sine wave oscillator too.

There is also an overdrive facility which can be selected with an onboard jumper. This allows the input to the filter core to be substantially overdriven, great for adding a bit of extra dirt to the sound.

Transistor Ladder Filter VCF

£210

Width
14HP

10HP

Depth
26mm

Current
75 mA

10HP

AJH Synth VCF SIlver

The MiniMod Discrete Cascaded VCA is a 10hp wide Eurorack format module. It features two fully discrete transistor VCA cores which are hardwired in series.

There are two audio inputs each with their own level controls along with two CV inputs which control the gain of VCA 1 and a Master CV input and level control which controls the gain of VCA 2. There is also an offset control so that a preset gain can be added to VCA 1. Internally it operates at the same voltage and signal levels as the early Model D voltage controlled amplifier and the output of VCA 1 is hardwired to the input of VCA 2.


A high gain (overdrive) mode can be selected for VCA 1 with an onboard jumper, this overdrives it into soft clipping and in this mode the second VCA can be used in a similar way to the Master volume on a guitar amplifier so that variable levels of distortion (or "grit") can be added to the sound.


Discrete Cascade VCA

£155

Width
10HP

10HP

Depth
26mm

Current
62 mA

10HP

AJH Synth VCA Silver

Two independent Contour Envelope Generators in a single 12hp wide Eurorack module. These are very accurate replicas of the Model D contour generators, with identical circuitry and component values running on the correct +9.3V and -10v supply voltages of the original; so they exactly replicate the original envelope response along with all of it eccentricities. Extra features include manual trigger buttons and envelope status LED’s


The contour generators played a larger part in the sound of the Model D than many people realise. There are two factors that make them unique, firstly the exponential slope when is used in conjunction with the (near) linear slope of the original VCA which is responsible for the famous Model D “punch”. Secondly, the re-trigger behaviour is quite unique, multiple retriggering increases the output level so that either the volume increases incrementally or the filter opens incrementally with each extra key press.


We have added independant Decay switches for each individual Contour Generator rather than the shared switch on the original synthesiser, these switches change the Contour response from AD (switch up) to ADSD mode (switch down).

Dual Contour Generators

£210

Width
12HP

10HP

Depth
26mm

Current
53 mA

10HP

AJH Synth Countour Silver

There is a lot of power and function contained within this deceptively small 6hp module. It features both the Glide and the Noise generator circuitry from the vintage Model D synthesiser.


The MiniMod glide uses a discrete dual FET circuit which includes a hold function that can gate the glide effect. Glide is only active when the Hold CV input is high, so if the hold input is connected to the gate output of a Midi/CV convertor then the glide will be active only while the key is actually depressed, emulating the exact behaviour of the original Model D synthesiser. The versatility of the module is increased by adding Glide Up only and Glide Down only modes in addition to the standard Glide Up & Down mode of the original circuit.


The Noise Generator is completely separate from the Glide circuitry. There are three outputs offering White Noise, Pink Noise and Red Noise. The noise source itself is all analogue and uses a specially selected transistor in avalanche mode which is amplified and filtered by discrete transistor based circuitry.

Glide & Noise Generators

£165

Width
6HP

10HP

Depth
54mm

Current
70 mA

10HP

AJH Synth Glide Silver

OwnersManual
Mini Mod VCO

OwnersManual
Mini Mod VCF

OwnersManual
Mini Mod VCA

OwnersManual
Mini Mod ENV

OwnersManual
Mini Mod GLIDE

£245

AJH Synth VCO Black

£195

AJH Synth VCF Black

£145

AJH Synth VCA Black

£195

AJH Contour black

£155

AJH Glide Black

A very unique and warm sounding ring modulator with three inputs, X, Y & Z It is a vintage design based entirely on a discrete transistor core, and includes an extra, resonant Z modulator input. It also has a Frequency Doubling switch, from a single triangle or sine wave input an octave +1 output is generated

Two independent Sub Bass generators with very fast tracking, creating -1 Octave and -2 Octaves from the X input. These are not simple square wave subs, they generate specially shaped waveforms and are useful up to 1kHz – they have a much lower harmonic content than square wave subs, designed to have more power and sit much better in a mix.

A five input DC coupled mixer based on the discrete transistor CP3 modular design dating back to 1974. The Outputs of the ring modulator, X and Y inputs and Sub Bass outputs are routed to the mixer by default – plugging a patch cable into any of the mixer inputs defeats this normalising and allows it to be used as a regular 5 channel mixer for both audio and control voltages.

A clipping / distortion module – input 5 of the mixer is considerably “hotter” than the other four mixer channels and will clip the signal as soon as it hits threshold level. If a DC bias voltage is added the signal is shifted and this allows positive or negative asymmetric clipping of the waveform

Ring Mod  :  Sub Bass  :  Mixer

£260

Width
14HP

10HP

Depth
24mm

Current
55 mA

10HP

OwnersManual
Ring Mod:Sub Bass:Mixer

£245

AJH Ring Silver AJH Synth Ring Black

The Sonic XV Eurorack module is a four pole Diode Ladder Fi­lter, featuring the circuitry and sound of the Musonics Sonic V synthesiser, which has a quite different character from transistor ladder filters. In addition to the regular 24dB Low Pass output we have added a 6dB Low Pass output and a Bandpass output, along with full voltage control of the resonance.

Two waveshapers have been added to hugely increase the sonic versatility of this module. There is a breakpoint based wavefolder on the input, with drive level that can be manually adjusted or voltage contolled. A bias control switch allows extra waveshape variations.

A second waveshaper is connected to the resonance circuit, which adds distortion and waveshaping to the resonance loop signal, again the drive can be adjusted manually or under full voltage control. A wet/dry mix control allows resonance waveshaping to be added from 0 to 100%.

These additions take the diode ladder fl­lter core way beyond it’s original function, it becomes a “­filter” module that can add harmonics and shape waveforms rather than simply fi­ltering them. With four independant CV inputs very complex fi­ltering and waveshaping sounds become possible

Sonic XV : Diode Ladder Filter

£260

Width
14HP

10HP

Depth
24mm

Current
70 mA

10HP

OwnersManual
Sonic XV

£245

AJH Sonic XV Silver AJH Synth Sonic XV Black