via this auction
"The TS-22 Pentode Filterbank is an analog filter that utilizes four unique vacuum-tube bandpass filters. That provides you with four independently sweep-able and tune-able filters over a four-octave range. Capable of complex filtering, the TS-22 lets you sweep the lows, mids, highs, etc. independent of one another or you can latch them all in unison. Tweaking can be accomplished from the knobs on the unit or via external CV sources from other analog equipment. A round window at the center of the unit provides a view of the glowing tubes at work inside!
The TS-22's unique use of vacuum-tubes gives it a unique sound that is analog, clean and sometimes unpredictable. Also included is a vacuum-tube pentode voltage-controlled amplifier (VCA) to shape the effect of the filter on your sounds. Adjustable resonance that leads to self-oscillation for each filter is also a treat! CV inputs to control the filter sweeps and VCA allow easy integration with your existing analog synths! The TS-22 is not your typical filter, but its unique approach may do wonders for your synth sounds, loops, samples and/or human voices!
SpecificationsPolyphony - Mono Input/Output
Oscillators - n/a
LFO - n/a
Filter - 4 vacuum-tube bandpass filters with resonance; staggered frequency ranges in one-octave increments, starting at 50 Hz; 1-octave range sweeping via knobs or external CV; Individual tuning controls for each filter from F to F.
VCA - built-in vacuum tube VCA to shape filters, usable with any external envelope generator via CV
Keyboard - None
Memory - None
Control - CV Input for filter sweep and VCA
Product review:"WHAT A BEAST! Nothing like the FAT thick tube sound this thing pushes. Not like the newer TM-2 they are selling now. This is the real deal. Its not going to give you that pristine prissy glass sound of "liquid analogue"; its going to beat your face in! So, I cant say its the absolute most clean and clear filter out there, but for what it is designed for, it DEFINITELY does the trick! I've gotten some WILD stuff from this thing. Try sending squarepusher through this baby......OUCH"
"Built like a tank, solid rackmount unit. Could be used anywhere. Just dont throw it down a flight of stairs and you should be fine....it does have glass TUBES inside! LOTS OF TUBESSSSS!!!!!!"
"Excellent device. Does things NOTHING ELSE CAN DO. This is an ORIGINAL old school piece of gear! Because of the shitty market demand, people will only buy cheap little stomp-box devices. People dont appreciate the beauty of true vintage synthesizers anymore. This thing is UNIQUE and RARE!!! If you see one, GET IT!!! Hell, I'll buy another one off you. It took me two years of searching, finally a friend told me a local band had one for some reason. A bit pricey, but worth it. From what I understand, less than a dozen were made. It is a unique part synthesizer history---REALLY! If I lost this, I would probably kill someone. Then I would begin the long hike back to tube synth heaven--maybe in another 2 years I'd find a replacement....""via brian comnes
Update via brian in the comments: "If I remember correctly , Eric only made a couple dozen of these ,and abandoned production mostly because the parts were so expensive ....if you have the balls (not afraid of 140 Volts) and tube project skills, the schematic is available online at http://www.cgs.synth.net/tube/ts22.html
not a beginner's project"
