Yamaha CS-70M w/MIDI

Service Status: 

Full service by KSR was carried out in December 2021, so this CS-70M is ready for sale & shipping now!


We’re excited to be able to get hold of this really super condition CS-70M as they really are quite magnificent synths for a whole number of reasons.  These were proper old-school designed hybrid digital/analogue systems made between 1981 and 1984, and it wasn’t long after these came out that the DX7 was introduced, which seems hard to believe really.

The CS-70M has for many people been overlooked, overshadowed by its bigger brother – the CS80, but this instrument has ascended in popularity among aficionados, and we know this synth is highly sought after by those who truly appreciate it.

6 Voice, dual-channel (stereo), aftertouch, 30 memories, ring-mod, chorus & Leslie effects, lowpass, high-pass, and bandpass VCF, fully programmable and with a 4 channel polyphonic sequencer etc.

Those in the know will already tell you that this is one of the finest analogue polys ever made and a work of audio art in its own right.  It shares most of the same technology as the CS80 and many of the characteristics and tonal qualities as well. The big ‘plus’ over the CS-80 is the digital auto-tune facility that snaps the voice cards into tune upon powering up the synth.  These models do not suffer from any wayward tuning issues, so this was a step-change for Yamaha when this hybrid polysynth hit the market, of that over the CS-80 and its pure analogue foibles at least.

There are a few demos on YT of these but we like this rather ambient-noodling one from ‘MoreAnalog’ because it demonstrates nicely how the CS70M has the CS80 vibe we are talking about: 



We purchased this CS-70M from a UK collector who had owned it for over 20 years at his home, where the synth has been in regular use. The Kenton MIDI was retro-fitted to this CS70M before the seller purchased it back in the 90s, but it’s a welcome addition and really helps integrate the Yamaha into a modern studio environment.  The synth is not supplied with the consumable magnetic storage strips eluded to in the user manual.


The cosmetic condition of this example is extremely good overall with only light user wear & natural ageing to the control surfaces. The faux wood laminate cabinet is in very good order with only a couple of spots where this has been worn.  We would grade this as “very good original condition – 8.5 out of 10 cosmetically.’

All the original controls, slider-caps, knobs are intact and everything still looks sharp and clean.  We don’t have any accessories with this, or an original user manual, but we can supply one in PDF format for the new owner.

About Servicing:

Operationally, our trusted and world-renowned ‘Yamaha CS Series’ restoration expert – Kent Spong of KSR, has already carried out a full service on the CS70M, so it’s 100% perfectly working and ready for its new owner now.  Servicing included re-capping the PSU, full system-wide test and calibrations and cleaning of sliders and pots where needed.

The CS-70M operates from 100V to 240V as there is a switchable PSU switch(s) on the back panel, and this Yamaha is supplied with its original and very specific 2-pin power cable.  

Packing, Shipping, Insurance and Warranty: 

We can ship this CS-70M worldwide, although the packing, shipping & insurance costs are not included in the sale price below, so are subject to quotation.  There may be some short delays in getting the packaging materials produced for shipping as they are custom ordered for the specific dimensions of each instrument.  We are happy to discuss your requirements so please email us if you have any questions on the logistics and/or need a quote.

As the instrument is being Brokered through RL Music, it will be sold with a full 3-month (return-to-dealer) warranty, covering all parts and labour.

Sales Price: 

£9,000 GBP

VAT is not applicable to UK buyers, however, the packing & shipping costs are subject to VAT @ 20%, should you need the goods shipped to you.  The CS-70M can be available for collection from us directly in the South of England (Reading, Berkshire).


This CS-70M is now SOLD.  This listing was updated on 1st December 2022 @ 10:31 GMT.

Click on the thumbnail for a higher resolution photo of the actual CS-70M for sale.  If you require specific pictures not already featured of the instrument then please contact us so we can try and accommodate your request but there may be a short delay in getting this done for you as the instrument is currently in secure storage.