Yamaha PortaSound MK-100 Vintage Electronic Synth

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Yamaha PortaSound MK-100 Vintage Electronic Synth

If you buy after clicking affiliate links on this site we might receive a commission from companies such as eBay, Amazon etc This does not affect the price you pay.
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Yamaha MK100 Unique and quirky portable keyboard with a unique method of creating patches and custom rhythms.

 

Being sold as Parts & Not working as it was working OK but started failing the last time I turned it on with notes cutting out or hanging.
Not sure what the problem is but it might still be useful to someone who could fix it or perhaps use it as a a base for Circuit bending

 

 
 

main features:49 mid size keysmono sound, stereophonized by “stereo symphonic” leslie simulator (2 speeds)polyphony 8 notes (drastically reduced when duet/ trio or melody mixer active)12 semi- OBS preset “orchestra” sounds {organ, trumpet, saxophone, piano, harpsichord, synthe 1 | piccolo, violin, oboe, music box , guitar, synthe 2} (selected through 6 locking OBS buttons + bank switch button)12 semi-OBS preset rhythms {disco, rock’n’roll, 8 beat, rhumba, swing , march | 16 beat, shuffle, bossanova, samba, slow rock, waltz} (selected through 6 locking OBS buttons + bank switch button. Each rhythm has each 3 switchable bass and chord variations.)locking push button switches to select sounds, rhythms and sustainsustain {off, depth 1, depth 2} (selected through locking buttons)vibratofingered & single finger accompaniment (manual chord mode with rhythm off)rhythm fill- in button (left, next to the keys)sliders for master volume & tempobass & rhythm volume slide switches (each 5 steps)transpose knob (-5..+6 semitones)”custom drummer” (all rhythms and accompaniments are re- programmable!)”multi-menu”: a row of 12 buttons + mechanical 9 page scroll menu to select functions.synthesizer: all “orchestra” sounds can be re- programmed; every sound consists of 2 sub- oscillators of those each can select 1 of 4 preset envelopes and 1 of 4 preset waveforms (timbres). The waveform and timbre sets of both sub- oscillators are different and not editable. Every sound can have vibrato on or off.every rhythm and “orchestra” sound can be switched between edited and preset version without overwriting the edited one.”melody mixer”: To the highest held note can any of the other sounds be layered.bass and chord accompaniment voice is selectable from any of the “orchestra” soundsmulti- track sequencer (melody, chord, bass) with cassette savingsound generator based on static digital waveforms + envelope; at low tones sample aliasing gets audible.  The drums sound like squarewave blips, the hihats sound somewhat metallic and may be shift register noise or a very low res waveform sample. The mixed digital sound is outputted mono through 1 common resistor array DAC (8 bit?) and then post- processed by the analogue leslie simulator. The PCB of this instrument is quite large and has at least the complexity and component count of a C64 homecomputer.battery backed up RAMjacks for line out, headphone, AC adapter and data cassette.

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Category: Musical Instruments:Keyboards and Pianos:Electronic Keyboards
Location: Kettering