Description

In good working order, with power strip.

A Eurorack-format voltage-controlled filter based on the classic Steiner-Parker Synthacon design, known for its aggressive, resonant character and versatile routing options.

Type
Eurorack Filter Module

Model
Steiner-Parker VCF (Yusynth design)

Manufacturer
Timo Rozendal (based on Yusynth circuit)

Country of Manufacture
Netherlands (DIY/independent builder)

Year of Introduction
Varies by build (Yusynth design published mid-2000s; Rozendal builds in later years)

Controls
Cutoff Frequency, Resonance, Individual Level Controls for LP, BP, HP Inputs

Input
1× LP input
1× BP input
1× HP input
1× 1V/Oct CV input
1–2× additional CV inputs for modulation

Output
1× audio output (mixed filter response)

Power Supply
Eurorack standard (+12V/-12V)

Notable Features

  • Filter Type: Multimode VCF with low-pass, band-pass, and high-pass modes

  • Design Origin: Based on the original Steiner-Parker Synthacon filter, with enhancements by Yusynth (Yves Usson)

  • Sound: Known for aggressive, nonlinear resonance and capability to self-oscillate

  • Modulation: Accepts multiple CVs for cutoff modulation; capable of FM-like behavior at high CV rates

  • Build Quality: Handbuilt by Timo Rozendal, often featuring quality jacks, knobs, and panel finishes

  • Routing: Independent level controls for each input type allow complex filter blending