The Stoel Music Systems Norton Filter is a 24db/octave voltage-controlled lowpass filter based on the later versions of the ARP 2600 filter.

The Stoel Music Systems Norton Filter is a 24db/octave voltage-controlled lowpass filter based on the later versions of the ARP 2600 filter. It uses a peculiar type of amplifier device known as a Norton amplifier, originating in the mid-1970s and finding applications in electronic music and analog video processing. The filter core consists of four Norton amplifiers and four precision-matched, German-made Wima film/foil capacitors to provide excellent stability and a sharp filter response. The iconic resonant sound of this filter is one of the main reasons it is still sought after today. Our version of this filter adds voltage-controlled resonance to expand and automate the creative possibilities. This module has an audio input and output jack, a 1V/octave frequency CV input, another variable CV input with a knob, and a variable resonance CV input with a knob. There is also a knob for input level control, filter cutoff frequency, and resonance amount.

All Stoel Music Systems modules feature aluminum front panels with a durable high-gloss white finish. For a crisp appearance and exceptional durability, the front panel markings are digitally printed at high resolution with UV-cured ink. Mounting holes are plated to significantly reduce screw rash. The power connection features polarity protection to prevent accidental damage to the module if it is connected backward.

Each module includes a 12” long 10-pin to 16-pin ribbon cable compatible with the Eurorack standard, M3 mounting screws, and a complimentary sticker.

Model EM1224

https://www.stoelmusicsystems.com/eurorack/norton-filter