MATRIXSYNTH: Super Rare Vintage Synthesizer 1970s SLM Concert Spectrum Keyboard SN 153145


Saturday, July 18, 2020

Super Rare Vintage Synthesizer 1970s SLM Concert Spectrum Keyboard SN 153145

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via this auction

You can find a demo of one here.


"This is a Concert Spectrum sold by ST. Louis Music.

These were only made and sold in 1975 and 1976.

These were intended for professional use and were used heavily by the likes of ELO and Journey in the studio and on stage in the mid to late 1970s.

Incredible vintage sounds and effects from this ahead of it's time keyboard.

Variety of voices and rally cool stereo and panning effects built in. You can conbine any of the voicings and it will let you pan certain voicings to different amps and cabs, you can even mix these voicings during playing. Incredibly innovative for the time.

The last couple of these keyboards sold for over $1000 on Reverb in comparable condition.

Some things to consider with this specific keyboard:

The top-side pannning sliders and buttons are a bit scratchy and could use some cleaning.

It is missing two volume slider knobs on the front of the keyboard. One of the sliders (the volume for the bass portion of the violin voice) has been broken off although the slider still works well and moves freely with your fingers, an easy fix for sure.

Five keys do not work with the "piano" and "harpsichord" voicings. These same keys work well with the other instrument voices. I think that most musicians will not be concered with this due to the fact that these are the two least desirable voices on this model. You really want this synth for it's wonderful vintage sounding "violin" and "cello" voices.

The 'decay' on one key is fairly short and doesn't respond to the adjustment setting. Almost impossible to discern when playing chords and solos.

This keyboard came with two metal "legs" that were used for a stand. These legs were missing when I acquired it. This keyboard is better suited for a multi tierd stand...It would look awesome with a vintage Moog sitting under it!"

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