AM1006 24dB Low Pass Filter

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12 HP|AM1006 24dB Low Pass FIlter|User Manual (PDF)|ModularGrid|You Tube

 OVERVIEW This 12HP module is a re-imagining of the ARP 1006 low-pass filter which was built around a traditional “Moog” transistor ladder. It has a cutoff range between 16Hz - 16kHz and goes into self oscillation from 350Hz upwards. The 1006 first appeared in the ARP 2500 synthesizer in 1970, as part of a combined filter and VCA module. 

We have separated out the filter from the original, so we can provide the maximum number of signal and CV inputs, just like the original which used matrix switches to engage multiple sound and CV sources. This is the ultimate replica of the original.

DESCRIPTION The AM1006 has been carefully engineered to replicate the original filter as closely as possible:

• Large number of inputs (3x audio, 4x CV), to mirror the 2500 matrix switch
• Matched transistor pairs in the ladder filter and buffer
• 5% carbon resistors on all inputs, to mirror the variations in the original
• WIMA Polypropylene capacitors (THD) in the transistor ladder
• 680nF film capacitor for DC coupling the filter output, as per the original
• A fast slew rate BJT Op Amp (LM318) on the output, as per the original
• V/OCT trimmer added for precise frequency tracking
• ARP 2500 control knobs with coloured spun aluminium inlays (Rogan RB-67)
• Black and silver phenolic control knob for frequency cutoff
• Bourns PTL20 LED slide pots with subtle amner LED's for CV1 and CV2 depth
• Careful translation to 12V power to retain self oscillation

The AM1006 has the original warm saturated ARP transistor ladder sound, coupled with an amazing aluminum printed front panel design. 

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CONNECTIONS There are eight 3.5 mm jack sockets on the anodised aluminium front panel: 

• IN 1, 2 & 3 - audio signal inputs with individual level control
• CV 1, 2, 3 & 4 - 1V/octave control voltage inputs for filter cutoff
• OUTPUT - audio signal output

There are high quality Alpha rotary potentiometers for adjusting frequency cutoff, resonance and the three signal input levels, along with Bourns LED slide potentiometers for frequency modulation from CV 1 and CV2 inputs.

The module comes with a set of M3 mounting screws and washers, and a standard 10 to 16-way Doepfer power cable.

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PRODUCTION STATUS: IN PRODUCTION