MATRIXSYNTH: Vintage Arp Quadra synthesizer

Friday, December 02, 2016

Vintage Arp Quadra synthesizer

via this auction

"This is an Arp Quadra with some moderate wear and some minor damage. The damage includes a removed power switch (it is on whenever the power cord is plugged in), a removed programmer switch (it is always in programmable mode), the tip broken off of the BASS OCTAVE SWITCH (DPDT), and the tips broken on of 5 sliders: MASTER VOLUME, EXT VOLUME, PHASE SHIFTER RESONANCE, STRING BASS VOLUME, and ELEC BASS RESONANCE - looks like all 100K linear taper. I have used this instrument and never replaced any of those because I can still use the broken sliders and switch. There are 35 sliders but only 22 knobs are included, all but 2 have white markings on them. I have no idea why the others were missing. I have been keeping them in a separate plastic bag. Everything but the knobs are easily replacable, although I'm not 100% sure about the power switch having an exact replacement. There is also a hole drilled into the control panel near the right end of the keyboard which is the right size to add a 1/4' jack. The photos should show all the wear.

The good news: The membrane panel switches all still work perfectly. The original fragile key contacts have been replaced with much more durable ones. The synth still sounds beautiful. I tried several combinations to make sure it still works right."

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