MATRIXSYNTH

Perrey and Kingsley with CrudBox

flickr by jobenbelgium
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"RSF Modular 11

RSF Modular 11 modules.Contains 8 x VCO,3 x VCF,4 x VCA,4 x Env,1 x Phaser,2 x Noise/S&H,1 x Lag,2 x Env Fol,3 x Mixer,1 x Ring Mod,3 x Power,many spare pcb's,some with frontpanels.Also a uber rare Polyclavier with 8 x cv/gate,arpeggio,keyboard mode,sequencer.RSF Modular 11 have been built in very low quantities.Somewhere around 20 systems have been built and less than 300 modules produced in total."

Gakken SX-150

via this auction
"Features
* Size: 4.5" x 6"
* Controls for LFO, pitch envelope, frequency cutoff, resonance, and attack/decay
* Slide controller (pen type electrode)
* Output and external input 1/8" jacks
* Small built-in speaker
* Runs on 4 AA batteries (not included)

Putting it together
Assembly of the kit requires little work - the circuit board comes fully assembled, i just mounted it to the panel and connected the stylus control strip. Power is provided by 4 AA batteries and a small speaker is included in the design. I highly suggest connecting the output to external amplification (this little guy really does sound quite good!). The "external source" jack accepts an amplified signal and converts its frequency into pitch control. Controls for LFO, pitch envelope, frequency cutoff, and attack/decay are included. Each potentiometer gives a wide range of response, so you have a relatively large amount of control over the sound."

Mod me
The simple design seems to suggest that the SX-150 wants/needs to be modded, hacked, and/or customized. Using the stylus/pitch-strip control only gives you a taste of the good sounds you can get from the kit. The SX-150 kit is very easy to use and some modding ideas are bound to come to mind should you get your hands on one. At the very least, you can choose from a number of included decorative decals - and at the more advanced end, schematic and code for using MIDI input has already been posted. I'm sure more sweet DIY add-ons are in the works - very awesome.

The Controller F - A touch pen generates CV and Gate.
- Also has a tiny extenal input that does F/V conversion.
(but also responds to amplitude :-).
VCO F Has saw-tooth output
VCF F Sullen-Key type 12dB/Oct filter. Very much like Korg MS-20 filter.
Envelope Generator F AD type.
LFO F Two output waveforms: triangular and rectangular.
Output F "

signal flow diagram below

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MFB OSC-02 VCO

via this auction

"From MFB:
The osc-02 uses fully analog technique taken from mfb synth ii model. three oscillators with all benefits and the typical character of analog construction in a single compact module.

Osc-02 offers a variety of notable functions: beside a common cv-control voltage for all vcos, all oscillators can be individually controlled by cv-sources, e.g. by different tracks of a cv-sequencer like doepfers maq-16/3 or the as oberkorn. vco 1 can be synchronized to vco 3, individually or paired with vco 2. the same goes for external hard-sync. the additional cv-inputs allow for common and individual modulations.

Three outputs allow for summed and individual audio outputs. a separate outputs carries a digital ring-modulated signal of osc 1 and 2 (configurable to osc 1-3 by jumper).

The module has a width of 80 mm (16 te)."

Dave Smith Instruments (DSI) Prophet 08 SN 16

via this auction

Serial Number 16. I wonder how many have been made to date.

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Roland juno 106 original case

via this auction

Sammich SID Commodore 64 MIDIbox SID

via this auction

"Sammich SID - MIDIbox SID synthesizer
2 x SID (stereo output, midi in/out). Mios v1.9g. These are sold as kits but if you don't want (or can) build, get this one.
Works fine and sounds awesome!

More info: http://www.midibox.org/dokuwiki/sammichsid"

Roland Jupiter-8 DCB

via this auction

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Hohner Multimonica II

via this auction

There are tons of more pics at the auction. I grabbed a few including some of the inside for the archives here.

Here is a Wikipedia snippet on the Hohner Multimonica II:

"The Hohner Multimonica is one of the first mass produced electronic synthesizers, dating back to 1940. Produced by the German Hohner GmBh, it preceded even the more famous Selmer Clavioline. The instrument is a combo of a fan blown reed organ (lower manual) and a monophonic sawtooth synthesizer (upper manual). It’s circuitry was designed by the German engineer Harald Bode. There have been at least two series of Multimonica, with different control panel layout and schematics. The earlier models are now being a real rarity, since their production was halted by the World War II, and many units may have been lost in the war. Multimonica II was released by the end of the ’40s. The front panel controls of the Multimonica I from left to right are: gain knob for the microphone input; power switch and overall volume knob; synthesizer/amplifier selector; power switch for the blower fan; tuning knob; four selector switches for different harmonics filtering of the synthesizer sound; four selectors for the different loudspeakers; vibrato switch.

The Multimonica II featured no microphone input, and only one loudspeaker, but provided more types of harmonics filtering, and the electromechanic vibrato was changed to a tube based and more sophisticated design. The front panel controls of the Multimonica II from left to right are: power switch and overall volume knob; six selector switches for different preset sounds of the synthesizer; tuning knob; two selector switches for different harmonics filtering; three switches for the vibrato speed and amplitude; power switch for the blower fan. A photo of a third model can be found on the World Wide Web, looking like a simplified version of Multimonica I (without microphone input). The circuit is based on Philips 13204 X, Philips EL41, Telefunken EF41 tubes for Multimonica I, and EL41; ECC40; EF40 tubes for the second series."

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