metasonix/rk6

RK6 Resonant Lowpass Filter

Sallen-Key 2-pole resonant lowpass filter with a pure vacuum-tube signal path using a 17JK8 dual triode. Cutoff and resonance are controllable via panel potentiometers and CV inputs. Cutoff CV accepts 0–3 V and roughly follows Hz/V standard.475

Capabilities 3

Lowpass Filterlowpass-filter: Sallen-Key 2-pole topology at -12 dB/octave, pure tube signal path via 17JK8 dual triode.475
Tubetube: Entire signal path is vacuum-tube using a 17JK8 dual triode, operated conservatively for maximum tube lifetime.475
Vcfvcf: 475

Jacks 1

Name	Signal	Voltage	Description
Inputs (1)
Cutoff CV	cv	0V to 3V	CV input for cutoff frequency; accepts 0–3 V and roughly follows Hz/V standard.475

Parameters 3

Name	Type	Range	Behavior
Cutoff	knob	—	475
Input Level	menu_setting	—	Adjusts the level of incoming audio before it reaches the filter circuit.475
Resonance	knob	—	Resonance behavior varies depending on the cutoff setting.475

Firmware history 0 versions

No firmware history recorded.

References 2

[475]
Metasonix RK6 product pageproduct_page
source 475 canonical ↗ archived ↗

⚠ verified 2026-05-17 · manufacturer changed since last verified
[476]
Metasonix RK6 at SchneidersLaden (retailer)product_page
source 476 canonical ↗ archived ↗

● verified 2026-05-17