Arp 2600 SN 261595

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via the listing:
"Arp 2600 grey face synthesizer, 2600P. I believe it is a V3 and has the Moog 4012 filter. It is working but could use a servicing as it has a few intermittent problems. I will be getting it serviced in a couple of weeks and might put it back up for sale at a higher price if it doesn't sell now, but thought I would offer it at a cheaper price to someone who may be up for the task.

Here are a few of the issues:

There appears to be a short somewhere in the audio chain regarding the VCF, VCA, mixer/reverb sections. These do not pass audio as they normally should; sometimes they work, sometimes they cut out (maybe just a short somewhere in there?). When patching directly from VCO's bypassing the hardwired, everything seems to work (all three VCO's and all their waveforms sound correct, ring mod works, filter works, S/h and noise works, etc).

One slider's shaft on the VCO2 pulse width is broken, though you can still use it.
Regarding cosmetics; the tolex is refinished, pretty good job and looks nice. The important part is the front panel looks near mint, graphics are all very bright and is amazingly clean. Due to these issue it is sold AS-IS. A capable tech should be able to fix it up"