MATRIXSYNTH

1974 MOOG MINIMOOG MODEL D with Vintage Anvil Case

via this auction

SN 4932

"This particular example displays a final inspection tag dated '6/14/74.'"

1970s Moog Satellite and Cumar CRD-0610 Catalog Ad

via this auction
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"This vintage 1970s Moog Satellite and Cumar CRD-0610 catalog is in excellent condition. 4 glossy pages shows both models with details and specs. "

1975 MOOG PROFESSIONAL SYS 15, 35, 55 SYNTHESIZER PRICE CATALOG

via this auction
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"This vintage original 1975 Moog synthesizer Professional Systems price catalog is in excellent condition. 4 pages shows prices for models 15, 35, and 55 with modules." Note the Norlin Music business card.

1970s Minimoog & Sonic Six Dealer Ad

via this auction
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"This vintage 1970s original Moog Minimoog dealer ad slick is in excellent condition. Two page glossy fold-out shows graphic ad format layout options."

Note the auction does not mention the Sonic Six. Not sure if it's a separate ad and was mistakenly included in the auction pics or if it actually is part of the auction.

1974 MOOG MINIMOOG SYNTHESIZER DEALER CATALOG

via this auction
See the seller's other items for more.

"This vintage 1974 original Moog Minimoog Synthesizer dealer catalog is in excellent condition. 8 page glossy color foldout shows specs and description."

Keio Donca Matic Rockmate

via this auction
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"It is said that this is/was the first portable drum machine made from Keio/Korg back in 1966. It sounds like an orchestra of insects! It runs of off a 9 volt battery or a 9 volt AC adapter."

Analogue Solutions VCO 12HP

via this auction
Noisebug (RSS)

"Width 12HP

VCO is a single VCO laid out in a similar way to the VCO section you would find on a monosynth. VCO includes a glide (slew) function, so this is a great bonus. The VCO can go down to low frequencies so they can be used as an LFO.

Voltage Controlled Oscillators (VCOs) in general

The VCO or signal generator, commonly found on most music synthesizers consist of an exponential amplifier, a resettable integrator and waveshaping circuitry. 'Voltage Controlled Oscillator’ means an oscillator whose frequency can be controlled by an external voltage.
A VCO is responsible for the pitch of a sound and its basic timbre. Most VCOs will offer a variety of wave forms. Some VCOs offer the facility to alter the pulse width of a square wave either manually or with a voltage (pulse width modulation).

Controls & Sockets:
Tune, Glide, PW, Saw Level, Square Level.
CV In, PW In, Sync In, Saw Out, Square Out"