MATRIXSYNTH: ARP 2600/3604P Synthesizer with Moog Filter


Tuesday, September 03, 2013

ARP 2600/3604P Synthesizer with Moog Filter

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"I was the ARP Custom Eng. Grp. Coordinator [article scan below]. Currently I am finishing a restoration on this ARP 2600 with 3604 keyboard. (Moog Filter) The case has had some water damage and needs new tolex, other than that it is in very good condition. I am listing it now but it is not finished. I have a new interface cable on order at this time. I have repaired the right output amplifier and the mixer input. Once I get the cable I will finish the repair and calibrate the unit.

Syntronics Audio on FB. Still servicing after all these years...

4/17 update: I got the cable in and it is a good fit. cinch-jones 10'. I did a functional test on it and things are looking good. S/H problem but everything else sounds good. 3 osc.'s, noise gen, filter, ADSR, mixer, etc.. The 3604 panel works fine. The keyboard is physically noisy and the contacts need to be cleaned and a calibration would be necessary. The console cover needs new tolex. The serial numbers from the console and the keyboard are a match.

4/22 update. I repaired the S/H, it was a bit difficult as a previous attempt by someone else was unsuccessful and possible the cause for the failures in my previous update. I suspect that this was the reason it must have sat in storage for an unknown length of time which is beneficial to the fact that it does not seem to have been used very much and the keyboard contacts are in very good condition. It has been functionally tested and most everything is working. I will calibrate it and offer it to be purchased with the tolex redone or as is. Feel free to email me any questions.

4/23 update. I cleaned the contacts springs, and bus bar. Calibrated the power supply, CV, 3 Osc's, and filter VPO in resonance mode. soundin' great.

4/29 update. There was a problem with the AR circuit which is now fixed. It's in pretty good shape now. The two main things that it needs is some new tolex and the keyboard is physically noisy and could used replacement keyboard bushings. I am entertaining offers at this time for the unit in 'as is' condition. I will continue to complete it but the sale price may change depending on the extra work on the tolex and bushings."

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