via this auction
"Oberheim SEM 2pole state-variable filter clone professional built using audiophile grade components. Some highlights on the controls:
Variable notch control
4 inputs for fading and mixing
bipolar attenuator for cut-off frequency as well as a simple attenuator of frequency
Resonance control
Built with the following component "upgrades":
Original spec'd FETs (2N4302)
Conductive plastic pots
silver mica filter cap
Elna Silmic II caps
Screened cable on outputs and twisted pairs on inputs to reduce on noise.
3.5mm Lih-sheng jacks
Mint...This was racked once for testing and calibration. Listing as used due to this being built in by a professional and not manufactured in a larger scale facility. Power cable is included with sale. Requires +/-12V power supply (Euro power headers)"
According to modulargrid: "Oberheim blessed SEM Voltage Controlled Filter pcb by Jeff Farr. Panel design by Clarke Robinson (clarke68)."
Side note: I created new Clarke Robinson, Jeff Farr, SynthCube & David Ingebretsen channel labels. David does not appear to be involved in this design, however I found him looking up Clarke Robinson in previous posts and decided to create a channel for him. David Ingebretsen is the man behind the new Steiner Synthasystem. He worked with Nyle Steiner on recreating the modules for the new system.
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