MATRIXSYNTH: Yamaha CS-70M Polyphonic Synthesizer SN w/ Kenton MIDI & Book of Voice Strips SN 1223

Sunday, September 18, 2022

Yamaha CS-70M Polyphonic Synthesizer SN w/ Kenton MIDI & Book of Voice Strips SN 1223

via this auction

"All photos are of the actual synth, the first couple are professional photos, the later ones are what I took.

It has Kenton midi and an original book of voice strips with spares. Some of the factory strips no longer have the data, just too old I guess. See the image for which ones are intact, green is good, red is dead.

The voice card wave shaper chips were hand-selected for perfect sine wave tone color-matching. It has a rebuilt power supply, new copper EMI shielding, an added cap mod that eliminates digital noise during certain operational modes, Key Code cable, updated CMOS proms from the old NMOS, new processor, new envelope timing film caps and more. The battery holder has been replaced with a new unit as someone didn't change the cells frequently enough. The midi output cable was adapted the Key Code connector using spare pins so no holes were drilled into the synth for the midi interface (horrors). Fully calibrated, looks and sounds glorious.

There are three blemishes to the finish shown in the last three images; a "rub mark" on the upper left shoulder (can only be seen in the right light), a small chip in the front veneer underneath the right top shoulder, and a small nick in the paint. Other than those three dings the synth looks like it's new. No paint issues or other wood issues."

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