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Metasonix TS-22 Pentode Filterbank

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Description
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.

Controls:

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.

Inputs:

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).
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Technical Specifications
Type: Analog
Synthesis: Resonators
Oscillators
Oscillators: 4
Oscillator Notes:
+ Filters self-oscillate at resonance max
Filters
Filters: 4
Types: Band Pass, Resonance
Filter Modulation: LFO
Filter Notes:
+ 4 tube filters
+ filters tuned 1 octave apart
LFO
LFO: 1
LFO Parameters: Sine
Polyphony & Tuning
Polyphony: 1
Timbrality: 1
Tuning: Atonal
Modes: Mono, Unison
Case
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.
Connections
Audio Output Connections: 1/4" Phone Jack, Mono Out
Audio Output Count: 1
Inputs: 1
CV Ports: CV IN
Production
Year Released: 2000
Year Discontinued: 2002
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