via this auction
Some pics of the circuit board below. Tons more at the auction.
"For sale is this vintage 1972 ARP 2600 series "2600P" analog synthesizer and matching "3604" keyboard. This particular set, serial numbers 26189 and 36186, is in very good all original condition and includes the original case lids, the original gray power cable, a non-original keyboard 6-pin cable, and non-original patch cables. The ARP 2600 is considered the absolute benchmark in compact analog semi-modular synthesis. Extremely versatile, and capable of producing a seemingly indefinite amount of both classic and modern synth sounds, the 2600 has become the standard by which other synths are measured. This is an incredibly rare example in that it is from the very highly-regarded early production run with the desirable superior 4027 filters, famous for being one of the best sounding versions. I have owned many ARP 2600s, but this is the best sounding one, the difference between it and others is actually surprisingly significant, so do not miss out on this No Reserve auction with Global shipping, because these do not come along often, and when they do, have been selling for upward of $11,000.00! This is a No Reserve auction which means the highest bidder will win... regardless of price!
Played, and made famous, by a veritable who's who of modern music, the ARP 2600 can be heard on albums by: John Lennon, Stevie Wonder, Joy Division, Kraftwerk, Frank Zappa, Herbie Hancock, Steve Miller, The Beastie Boys, Cat Stevens, The Who, Depeche Mode, U2, and an ever-expansive alumnus of artists whom have featured this amazing synth in their music.
This early-production second version of the 2600 features the coveted 4012 filter which copied Moog's patented ladder-filter design, later ending in a legal dispute which forced ARP to change their faulty 4072 filters in 1977. It also features the rare 4027 chips, known for being more stable than their predecessors, and less noisy than those which followed. This is perhaps the best version made..."
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