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The 3003 filter is a voltage controlled, discrete analogue 18 db/oct ladder low-pass filter, employing hand-matched transistors.

The 3003’s RESONANCE circuit at max will sing out more than the TB’s signature chirping in a fun, bubbly, if washy, poorer relation, Mini “clone-ish" way; use it tastefully, or throw moderation to the wind for overwhelming chirp force.
 The 3003 filter has the most gentle sonic touch of its partners in the Boomstar fold, but nevertheless is quite capable of shaping precise, very dynamic tone. Whether or not this STUDIO ELECTRONICS filter is filling its traditional baseline boxing niche, driving a harsh, liquid, acid-like tone, a softer more rubber-bandy SH-101-ish presence, or out of the bass range

altogether, leading the way, all is within easy reach of this surprisingly warm and versatile VCF.

The 3003 can be distinctly vocal at times, especially when one is willing to put grittier, more distorted desires aside.

Width
12HP

10HP

Depth
40mm

Current
tba mA

10HP

OwnersManual
Boomstar Modular

Studio Electronics Logo

Boomstar

Modular

Boommod 3003

Boomstar Modular 3003

£225

The 5089 filter is a voltage controlled, discrete analogue, 24 db/oct transistor ladder, low-pass filter, employing hand-matched transistors. The ladder low-pass filter—a subtractive analogue sound synthesis foundation—in its lowest FREQUENCY setting removes, or cuts off higher frequency harmonics; its RESONANCE or Q circuit emphasizes those harmonics to the point of “squealy,” giddy self-oscillation, tracking the keyboard in its FULL setting quite nicely if seeking an alternative sine wave.

The 5089 has the roundest, slickest tone of all the Boomstar’s filters. Go easy on it, and round, creamy buttery flavours wrap the oscillators in earthy warmth; smash it and a meaty, satisfying overdrive, and a maximum harvest of vintage 1960s and 1970s organic-sounding, second-order harmonic distortion fill the plate. Every setting is balanced and bountiful. Looking for

traditional R ’n B baselines and leads? Focus here on the rich saturation of this benchmark filter and its symmetrical cascades of generation-stretching timbres. All BOOMSTAR MODULAR filters are hand-built in the U. S.

Width
12HP

10HP

Depth
40mm

Current
tba mA

10HP

OwnersManual
Boomstar Modular

Boomstar Modular 5089

£225

Boommod 5089 AJH Synth Logo

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

OwnersManual
Mini Mod VCA

OwnersManual
Mini Mod ENV

£145

AJH Synth VCA Black

£195

AJH Contour black

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