1977 YAMAHA CS60: Restoring the KAS board

Published on Feb 12, 2019 Stephen Coker

"Stephen Coker Restores the KAS board in the 1977 Vintage YAMAHA CS60 Polyphonic Analog Synthesizer.

These Japanese Instruments are Extremely Complex yet, very well built.

But, many of the Components are no longer available. Especially the Proprietary YAMAHA IC's.
Many of the PCB's are the same within the CS80/CS60/CS50 Synthesizers. The CS80 being the Largest and most dense of the three and, Most well known.

But, the CS60/CS50 are very nice Synth's and are Highly sought after, due to them having the same voice cards as the more popular, larger CS80.

The Difficulty Level in Restoring the CS80/CS60/CS50 instruments are very high, due in part from the amount of components used but also, the complexity of many of the circuits.

These are very unique instruments that are extremely expressive and, is the closest to an acoustic instrument that any analog Synthesizer has ever come, partly due to the non-digital implementation of modulation and, other voltages used within the instrument."