Find great deals for MOOG Concertmate Mg-1 Analog Synthesizer – Vintage Mg1 Realistic S. Shop with confidence on eBay!. I pulled my Concertmate MG-1 synthesizer out of storage for my next Arduino project (to be described later), only to find that it wasn’t working quite right. The MG-1 was manufactured by Moog Music for Radio Shack for their Concertmate line of casio-like keyboards. However, the MG-1 is a true Moog, somewhere.

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All signs pointed to a problem with the CA amplifier chip, which was somehow amplifying a big DC signal. As with many analog synthesizers, the MG-1’s resale price is slowly rising as alternatives and working instruments become less common, and buyers and sellers congregate online.

Fixing my Concertmate MG-1 Synth

I measured the inputs to the CA with an oscilloscope and found they all seemed normal. One thing to note however; the LFO cannot be used to modulate the pitch to create a vibrato of the Polyphony section.

This feature makes it at least a little more versatile than the Rogue. The second problem was that when I set the contour for an attack and decay, the note got louder and softer, but as the note got softer it was replaced with a buzz at the frequency of oscillator 1. This page was last edited on 27 Octoberat The similar Moog Rogue came after the MG It was produced without some standard Moog features, such as pitch and modulation wheels, as a cost-cutting measure aimed at achieving a lower price for the conccertmate market.

Therefore it is true that the Poly tones are not “faded my-1 by the Fall time release contour setting when a key is released. Because it was originally distributed in Radio Shack stores instead of specialized music stores, it is easily found and is usually less expensive than a Rogue despite actually offering more.

MOOG Concertmate Mg-1 Analog Synthesizer – Vintage Mg1 Realistic S

The similar Moog Rogue came after the MG Infew electronic musical instruments had the MG-1 combination of paraphonic poly section and monophonic synthesizer in one instrument. Since the polyphony section is independently tunable, it can function as a rudimentary third oscillator, allowing the user to create more complex tones than on similar 2-oscillator synths.


David Luce of Moog was involved with the creation. Although a picture of Elton John holding the MG-1 on his arm appears alongside the description of this synthesizer in Radio Shack’s and catalogs, he has never actually used it in any of his recordings or performances. There is also no sign of Midi or patch memory on the MG The multiple notes of polyphony feed into the single filter, giving a paraphonic result.

Who played this instrument? This is the very source of cheap Moog bass! If there’s a DC offset between the input pins 2 and 3, there will be an amplified DC offset at the output.

The Realistic Moog MG Fortunately, by some bizarre twist of fate, I happened to have one in my rather small box of parts.

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What a cool synth. The MG-1 was produced in great quantities for distribution in the consumer market. This is the benefit of not having the standard pitch- and mod-wheels. Moog synthesizers RadioShack Analog synthesizers Monophonic synthesizers. Additionally there is a simple Ring-Mod effect called ‘Bell’.

There are potentially several more mods you can do to this thing to make it shine. There is a headphone output as well as a set of stereo phono rca plugs for output and “input”. However, the output showed a 3. The picture below shows the two main circuit boards.

It is a common misconception that the Poly tones are not affected by the Contour settings. The Moog Concertmate MG-1 is the most widely owned of all vintage Moog synths, probably because it was produced in large quantities for the Tandy Corporation, and also its relatively low price.

By using this site, you agree to the Terms of Use and Privacy Policy. Images from Perfect Circuit Audio. Therefore, it is true that the Poly tones are not “faded out” by the Fall time release contour setting when a key is released. Unfortunately there is no pitch wheel or modulation wheel. This allows the creation of Saw- and Ramp- waves, as well as asymmetrical Triangle waves and unusual trapezoids, not otherwise found through modulating with the LFO alone.


In addition, the contour input showed it was picking up some crosstalk from the oscillator 1 trace that runs next to it, and this was being amplified into the buzzing noise.

It is a lot like the strap-on Moog Liberation in its design and architecture and also looks and sounds very much like the Moog Rogue.

Unique Modulation Options Although this keyboard is often erroneously described as having “less” features than its Moog siblings, the Liberation and the Rogue, there is a patch which only the MG-1 can do: The square wave based polyphony section is described as a “cheesy organ sound” [2] by some, and well-used by others. I studied it and the schematic, and my first guess was that there was a DC offset going into the CA amplifier, resulting in an amplified DC signal in the output.

Pin 5 of the receives the contour signal to provide the attack and decay when you press a key. Very basic and easy to use, this is a nice cheap way to get your hands on Moog sounds!

The rest of the modulation, including the sample-and-hold, will affect the Polyphonic Signal via the filter section. The Polyphonic features of this synth are of particular interest as polyphony was rare in synthesizers of the time. For other uses, see MG1 disambiguation.

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It can produce sawtooth, square and pulse waveforms, and the oscillators are detunable and syncable. The upper board is the sound generation, filtering, and amplification, while the lower board has the power supply, keyboard, control, and polyphonic concertmatd. When a key is released the polyphony tone for that key stops immediately.