Rare ARP 2600 2601 Classic Analog Synth With 3620 Keyboard

By | February 9, 2016

Sold Price: $7357   |   # of Bids: 3

Sold On: 2016-02-08

This is a beautiful ARP 2600 2601 v1.0 with 3620 keyboard. Both are in excellent, fully functional condition and have been restored and upgraded (see below). The “orange and black” 2601 is the last 2600 version produced by ARP. It is the most reliable version, an update to the more common grey version. None of the modules are set in epoxy, making it more serviceable in the long run. The 3620 keyboard is also the last revision of the keyboard produced specifically for the 2600. It has and added LFO (to free one of the oscillators), but best of all, it has duophony! “The final revision of the ARP 2600 saw the synth adopt the black-and-orange livery of latter-day ARPs. This offered numerous internal improvements, most significant of which was the demise of the epoxy-encased circuitry of earlier models, which made these 2600s relatively simple to repair.” 2601 v3.0: Late in 1980, a final revision was released with un-potted submodules, making them easier to maintain, and a revised suitcase. However, these late models are quite rare as their release coincided with ARP’s final days.” “The critical circuits of the early 2600s were cast in epoxy blocks that are almost impossible to repair. Around 1975, ARP switched to potting the circuits with silicone rubber, then topping them with epoxy, which is less difficult to repair. A few years later they stopped potting altogether, resulting in circuits that can be easily fixed.” (Mark Vail / Bob Moog in “ARP 2600 Most Popular Modular Synth” in: Vintage Synthesizers, page 128) What’s included: Arp 2600 2601 synthesizer Arp 3620 duophonic keyboard Set of patch cables.  The previous owner had several upgrades performed on it. The 2600 and keyboard were purchased new in 1980 by a local jazz keyboardist and Zawinul enthusiast. He was using it with a Polyfusion keyboard, the 2600 had been modified to accommodate this keyboard, but the modification was reversed during restoration. This had to advantage of preserving the original 3620 keyboard which was hardly ever played. The keyboard is in great shape, my tech had to clean the bus bar due to lack of use, but it now works 100% and plays great. The original owner also took the logos off the units, possibly to make the cases less recognizable to thiefs. Both cases are also nice on the outside, the metal parts are shiny and the tolex looks great except for some light wear and small stains (look at the pics, this is barely noticeable). The 2600 was thoroughly taken apart and cleaned, every circuit board was removed and cleaned all sliders were lubricated and every connector was cleaned. All cabling was then reorganized and tie-wrapped nice and neat! Once that was done, it was calibrated according the service manual. That means that every slider operates smoothly, every connector works and it is clean, dust-free, and most importantly, it sounds amazing, like it’s supposed to! Here are a list of the specific repairs : 4 slider tips were repaired with identical replacements. NOS power connector was re-fitted (comes with original cable) NOS handle was fitted (quasi-identical) NOS keyboard connector was fitted Some Polyfusion-specific internal normalization was removed Polyfusion front panel gate input removed and capped 2 Polyfusion connection inputs removed from the left side and patched (one tiny hole on upper right panel left (see pics) new orange LED in the power indicator New capacitors on the power supply Tolex on both cases was cleaned and refinished. Additionally, my tech performed some great modifications: Filter upgrade: the 4072 filter was upgraded to correct the “error” causing the filter to open to a maximum of around 12k, now it’s nice and bright when fully open (28k apparently). The filter kept its original character, just with extended range. The upgraded 4072 is a very nice sounding filter, just as good and useful as the previous moog-like filter Arp used, but a bit more unique and exclusive! Reverb upgrade: The reverb tank was changed top a looong type 9 NOS replacement. The first 2600s’ had this type of tank and are known for their longer, fuller reverb. The original reverb tanks were made by Hammond, their reverb division then took the name Accutronics. Thankfully I was able to purchase a remaining american made Accutronics tank (now made in Korea). My tech also performed a modification to lower the noise floor, and made the connections balanced using good quality cables (Canare). I am a fan of spring reverb and own a few and was very pleased with how this one sounded! The tank has been mounted vertically to avoid interference with the speakers at max volume but can still occur if you try hard. These mods, along with new caps on the power supply and proper calibration, greatly improve the 2600’s signal-to-noise ratio. I chose to limit the modifications to this, everything is possible when modifiying gear, but preserving the character of such a classic is more important.” This is a fantastic unit and you’re very unlikely to find a better ARP 2600 on the market. It’s a rare classic and will remain so for a long time.

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