
via this auction
"Vintage RSF Kobol Expander I (s/n: 13311) in excellent working and visual conditions. It's a monstrous analog semimodular synthesizer based on SSM2040 + SSM2050 IC's and Fairchild UA726. His sound is impressive, great basses and awesome filter!!! Also is possible to change all the waveforms by control voltage..."

One off the best monosynths ever!
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