Yamaha CS5 - A fully analogue monosynth built circa 79-83. A very fun hands-on instrument with nice vintage sounds. I love it to bits!
Unfortunately, it never worked 100% when I got it. The chief problem being a terrible intermittent crackling noise from the unit's only output. Most of the pots were horribly crackly as well. After recording a handful of songs with it, I sent it off to Muzik Elektronix in Quebec for repair. Extensive work has been done on it already, including the replacement of several capacitors and other components, cleaning of all potentiometers, key-contacts, surfaces, etc... It now needs a set of integrated circuits, and is waiting for a donor ;)
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