Yamaha CS-20M

“What’s Included:
Included is the Yamaha CS-20M analog synthesizer shown in photos above, in addition to it’s power cord. No other items are included with purchase.

The item is fully functional with a wide array of classic vintage analog sounds. All knobs, sliders, and switches work fluidly. All 37 keys are aligned perfectly with no depressions. Cosmetically, the synthesizer is in fantastic condition, with minimal wear on the wood panelling. The overall excellent condition is a rarity for this classic vintage synthesizer made in 1979!

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Yamaha CS20M

“YAMAHA CS20M Analog Synthesizer – Recently Serviced by Rosen Sound in LA.

Everything works except the Modulation Wheel.

This is an excellent synth for all kinds of analog sounds, from bass to leads. It has memory to save 8 sounds. It works with CV/Gate.
I made some amazing sounds with this synth and I am sad to see it go, but I do not have much room for storage and need the funds. Plus I have not been making music for a long time, so I rather see it go to a good home.

Some of the sounds I made include the Pacman sound, which tells me perhaps they used this exact synth to create many of the sounds on Pacman. If you are into ambient music or sound production, this synth is really good for that. I made many nature sounds, such as water drops and bird sounds. ”
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Yamaha CS20M Project Machine

Up for auction is a Yamaha CS20M analog synthesizer.
The synth has been tested and most features work, except that it needs a YM617 IC.
It is missing a knob on the Sustain slider control. The slider still works.
All keys work.
All lower panel works.
Upper panel – patch buttons work, glide time/VCA level/Volume/Phones knob work (dusty), all other knobs/sliders/switches ineffective.” Click here to visit listing on eBay

Yamaha CS20M

“Good cosmetic condition, working well and I still use it regularly, few scratchy pots and it occasionally goes a bit crazy usually after it’s been left switched on for long periods. Could do with a service but not essential.” Click here to visit listing on eBay

Yamaha CS20M

cs20m “This synthesizer has had a recent restoration including a recap throughout the instrument and power supply has been totally rebuilt. Full calibration. Great playing condition. This is an original North American, USA 120v model not a Japanese 100v imported one.” Click here to visit listing on eBay

Yamaha CS-20M

cs20m “Yamaha CS20M Analog Synthesizer

In good working condition, all synth functions / keyboard / sliders / knobs / memory working well.

Battery compartment is missing the cover, but this is not a problem as the battery box that the batteries sit in is there.

In very good cosmetic condition but does have some marks and scratches here and there.

Comes with original case.

Unit runs off 100V so you may need a transformer depending on your countries power.” Click here to visit listing on eBay

Yamaha CS20M


Any questions please call 949 342 5036. Local pickup is welcome. Feel free to ask for any questions about the synth or about shipping.

Monophonic analog synthesizer released in 1979.
In excellent cosmetic condition, fully working order, few minor scratches on the wood panels, a little paint removed on metal near “20M decal,” where corner of metal meets wood and keys. If you look hard at (pic 4), you may detect the area. Its truly hardly noticeable.

Comes with power cable.
Item will be safely packed for transport.” Click here to visit listing on eBay