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Metasonix TS-22 Pentode Filterbank

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    TS-22 is unlike any other "filter" or "filter bank" offered on the market. It consists of four simple vacuum-tube bandpass filters. Their center frequencies are offset by 1 octave from the previous filter. Each filter is independently sweepable with panel knobs; or they are all sweepable in unison, using either a panel knob or in external source of control voltage, such as an envelope generator or LFO. (A special optoisolator does the job.)

    Because these filters do not behave like solid-state filters or "virtual analog" devices, they sound very different from any other filter ever offered on the market.

    And the TS-22 includes a vacuum-tube pentode voltage-controlled amplifier (VCA) at its output, optionally usable in conventional VCA fashion in a modular synthesizer, to impose an envelope loudness contour on the filter output (using an external envelope generator). TS-22's CV inputs are 100% compatible with all existing envelope generators and other modular-synth circuits.

    Thus, the TS-22 constitutes most of the signal processing path of a classical monophonic analog synth. Only with no transistors in the path.


    INPUT LEVEL, single, for all 4 filters
    FILTER CV SWEEP sweeps center frequency of all 4 filters simultaneously.
    TUNE for each filter, over approx. 1 octave, A to A, calibrated on panel in equal tempering
    RESONANCE for each filter, adjustable to near-cutoff of signal to oscillation.


    Audio input, requires at least 100 mV AC
    FILTER CV IN: 0-1 volt DC usable range for one octave sweep (FILTER CV SWEEP becomes a CV level control when this input is used)
    VCA CV IN: 0-100v usable range, circuit gain at CV input = 5 volts DC will be approximately 2.

    Output: audio signal, 20v p-p maximum.

    Thru-module gain depends on settings of RESONANCE controls; when resonance of all filters is set to 1, voltage gain is approximately 2 (if VCA CV IN is not used).
    Type: Analog
    Synthesis: Resonators
    Oscillators: 4
    Oscillator Notes:
    + Filters self-oscillate at resonance max
    Filters: 4
    Types: Band Pass, Resonance
    Filter Modulation: LFO
    Filter Notes:
    + 4 tube filters
    + filters tuned 1 octave apart
    LFO: 1
    LFO Parameters: Sine
    Polyphony & Tuning
    Polyphony: 1
    Timbrality: 1
    Tuning: Atonal
    Modes: Mono, Unison
    Case: Rack
    Rack Size: 19", 2U, Full
    Controls: Knobs, Switches, Mod - Wheel 2, Modulation 1/4" Jacks
    Display Type: LED
    Dimensions (WxDxH): 484mm (19.0") wide, 88mm (3.5") high, 356mm (14") deep (incl. front-panel handles).
    Weight: 12 kg.
    Audio Output Connections: 1/4" Phone Jack, Mono Out
    Audio Output Count: 1
    Inputs: 1
    CV Ports: CV IN
    Year Released: 2000
    Year Discontinued: 2002
    Manuals & Documents
    YouTube Videos
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