MATRIXSYNTH

Technics SY-1010 Analogue Synth

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Mint Oberheim Xpander SN Y63006

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ROLAND SYSTEM-100 SYSTEM100 Model-101

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Note the listing appears to be for the 101 keyboard only. There is no mention of the 102 expander.

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Cheetah MS-6 Polyphonic Vintage Analog Rack Synthesizer SN B1022713

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Check out that manual.

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Roland TB-303 Bassline Analog Synthesizer SN 185800 w/ Gig Bag

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Crumar Trilogy Vintage Polyphonic Synth

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Sequential Circuits Drumtraks Drum Machine SN 4741

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Pic of the inside below.

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Oberheim DX Digital Drum Machine w/ MIDI SN Q63001

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Pic of the inside below.

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Metasonix R-53 Vacuum-Tube Waveshaper Ringmod

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"out of production module, hard to find.
Metasonix R-53 Vacuum-Tube Waveshaper - Ringmod
this module uses a good amount of power, make sure you can run it.
200 mA +12V
200 mA -12V
0 mA 5V
25 mm deep

this module can do many different things from a slight tube sound to distortion and some waveshaping.
here's the description from modulargird. -

'The R-53 is directly derived from our legendary TM-1 device.

It uses a 12AF6/BD6 remote-cutoff pentode and a 12AV7 dual triode. Waveshaping is provided by a vacuum-tube "pulser" circuit that spits irregular pulses onto the input waveform. They synchronize erratically with the input pitch (if a waveform with sharp transitions is used). Combined with true vacuum-tube circuit distortion, this can provide a vast range of complex, aggressive distortion effects, utterly unique in the world.

A basic ring-modulation function is also available in the unit--applying a carrier pitch from an external oscillator to the screen grid of the pentode, this allows making inharmonic sum-and-difference pitch sound effects, with a unique vacuum tube pentode sound.'"

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