ARP 2600 Synthesiser plus manual, cables & ARP 3604-P Keyboard

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via this auction

"The 2600 brain and 3604-P keyboard were recently repaired and serviced to bring it up to spec by Andy Jury at Synthprof, and are still covered by their service warranty until the 1st January 2015."

"As you can see it packs down into two protective cases and comes with the original 2600 manual, recet repair receipts, service history dating back to 2011, mains cable, interface cable (keyboard to brain) and a large collection of patch cables.

It is in fantastic condition for it's age and though it is not perfect cosmetically (various nicks in the tolex, a modification to the side of the case where the mains socket has been replaced/updated and two small melt marks on two keys of the 3604-P) none of these hamper its performance in any way and are very minor when taking into account the vintage nature of this instrument.

The serial number is 2601-0*5*.

Here is some information about this model:


Based on the serial number it is most likely from 1976 and is a grey decal model 2601 v.1 with the larger front panel and improved jacks & sliders, but still has the disputed 4102 Moog style filter.

It was followed in 1977 by the models with the orange decals and a different filter which most people don't like (and believe has a design fault). 
The general consensus is that this is the best model to have apart, possibly, from the very early ones. 

From Vintage Synth Explorer: 
"The first 2601 models looked nearly identical to the last 2600P models. 
The major differences were improved jacks and slider controls and smaller trim holes. They were also still using the disputed 4012 filters during their production run from 1975-76."