I've got a Yamaha CS-60 for sale in Chicago, IL. It is from my personal collection. Everything works fine and I have replaced some sliders that were a little bit dirty. It is an exceptionally stable CS60 because all of the oscillator chips are factory selected "11."
In the factory, Yamaha paired up all of the oscillator chips with similar temperature response characteristics. If the heat went up, Yamaha wanted the scaling to go up the same amount with all of the oscillators.
According to Yamaha literature, "Each IC built into the "M" circuit board is ranked and labeled every 5 Degree C according to the degree of change in the musical interval on C1 and C6 affected by the ambient temperature change from 25 to 50 degrees C."
A value of 11 is the best and 96 is the worst.
