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bron: Vintagesynth.com
Model 2600:
The Model 2600 was produced in early 1971 and is known as the "
Blue Marvin". It has mistakenly been called the "Blue Meanie" but according to Alan R. Pearlman, the
"Blue Marvin" is so named after Marvin Cohen, ARP's CFO at the time. It came in a bright blue aluminum case with a funky and fragile wood and metal enclosure. It used an entirely micro-chip based voice path but the chips wound up being highly unreliable, although they sounded great! Only a few of these were made (approx. 25) and most of them were built in a garage.
Model 2600C:
The 2600C was produced mid-1971 under proper factory conditions. The blue face plate was replaced by a gray face, leading to this model's nick name of "
Gray Meanie". The wooden and metal enclosure of the previous model was retained, but a slightly updated keyboard (model 3604C) was added. About 35 of these were made.
Model 2600P:
2600P v1.0: Later in 1971 came the 2600P v1.0 which featured the same metal case (and the same electronics as the original models) now housed in a much more roadworthy
suitcase-style enclosure.
2600P v2.0: As mentioned before, the chips used thus far, though they sounded great, had reliability issues. ARP addressed this with the 2600P v2.0 around 1972. The most significant change was the switch from the Teledyne brand 4011/4017 VCO chips to the 4027 from National Semiconductor.
2600P v3.0: After a short run of the v2.0, a few more internal changes led to the 2600P v3.0 which switched to the 4027-1 VCO. These new VCO chips were noisy and did not sound as good as the previous chips. The rectangular Tonus ARP logo was replaced by a new G-clef ARP logo which is often used to distinguish these newer 2600's from the previous models version of the 2600P. Also, the front panel was made a little taller, providing some extra room along the very top and bottom of the front panel. The 2600P v3.0 was produced from 1972 to 74 and is the most common model.
2600P v4.0: A new duo-phonic keyboard (Model 3620) with LFO was introduced with the 2600P v4.0 in 1974. It also has the new G-clef ARP logo.
ARP 2600P v2.0
Unfortunately, further changes to inferior parts were just around the corner. The Model 4012 filter used in all the 2600s through 1976 utilized a design that was a copy of Moog's patented ladder-filter design. This led to a legal dispute between Moog and ARP which forced ARP, under the threat of legal action, to design a new filter. This resulted in the Model 4072 filter, a four-pole low-pass VCF which, unfortunately, is widely considered to be faulty due to a design error. The frequency response of the 4072 filter only goes to about 12kHz giving it a duller and weaker sound than the previous Moog style 4012 filter. This issue was not exclusive to the 2600, but also plagued some of ARP's other products including the
Odyssey.
Model 2601:
2601 v1.0: 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.
2601 v2.0: In 1977 ARP started using their new 4072 filter in the model 2601 v2.0 which also featured the bold new orange-on-black design. These were produced from 1977 through 1980.
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.
Model | Year | Filter | Oscillators | Color | Comments |
---|
2600 | 1971 | 4012* | 4011* | Blue/White | The Blue Marvin. Metal case with 3604 keyboard. Very rare. Great VCOs. |
2600C | 1971 | 4012* | 4011* | Gray/White | The Gray Meanie. Metal case with 3604C keyboard. Very rare. Great VCOs. |
2600P 1.0 | 1971 | 4012* | 4017* | Gray/White | Better suitcase-styled case with 3604P keyboard. Common. Great VCOs. |
2600P 2.0 | 1971-72 | 4012* | 4027 | Gray/White | Serial number restart using 26XXX format. Common. Good VCOs. |
2600P 3.0 | 1972-74 | 4012* | 4027-1 | Gray/White | Front panel changes: taller and a new logo. Most common. Noisy but stable VCOs. |
2600P 4.0 | 1974 | 4012* | 4027-1 | Gray/White | New duophonic keyboard 3620. Noisy but stable VCOs. |
2601 1.0 | 1975-76 | 4012* | 4027-1 | Gray/White | Serial number restart: 2601-XXX. Better jacks and sliders. Smaller trim holes and taller front panel. Noisy but stable VCOs. |
2601 2.0 | 1977-79 | 4072 | 4027-1 | Orange/Black | Filter with error. Noisy but stable VCOs. |
2601 3.0 | 1980 | 4072 | 4027-1 | Orange/Black | Filter with error. Noisy but stable VCOs. |