Synth Museum

"Synthesizer preservation via research and education."

The Web SynthArk


Yamaha SK15

(image courtesy of Yamaha)

Released: 1981

MSRP: Y155,400 ($1395US)


Swaps SK-10 brass section for programable polysynth section. Architecture Class: Conventional (subtractive).

Ebay Description:

The Yamaha SK15 is a 49 key, 7 voice analog ensemble synthesizer, featuring organ, string, and poly-synth sections, brilliance (organ and string sections), release, tremolo, sustain and volume pedal inputs, and vibrato. The synth section also features a slow attack button and a resonant low pass filter with dedicated ADSR envelope. The organ section features 7 stops.


Form Factor Dimensions Weight Audio Input Audio Output Communication Port Control Input Control Output Switch Input Power
49 keys W:818mm(32.25in) H:132mm(5.25in) D:316mm(12.5in) 12kg(26.4375lbs) no mono no no no sustain 12VDC 300mA 2.7W (PA-1|6xAA)


Compatibility Multitimbral Memory Program Memory External Storage External Programming UI Input UI Output
- N/A no no no dedicated sliders/knobs LED


Multitimbral Polyphony Unison Architecture


Effects Pan Modulator Volume Modulator Headphone
"Ensemble" chorus no EG Tremolo pedal yes


Arpeggiator Arpeggiator External Sequencer Sequencer Memory Sequencer External Continuous Program Change
no N/A no N/A N/A pedal no


Key Pressure Chord Memory External Control External Sustain Key Scaling Velocity Curves
no no no pedal no no


Name Signal Class Waveform Octave Range Amplitude Modulator Harmonics Modulator Pitch Modulator Wave Assign Modulator
Organ analog square? click 2' 4' 5.3' 8' 16' (mix) no no Vibrato no
Polysynth analog saw? synth:8-16' string(mix):8'16' no no Vibrato no


Name Signal Class IC Resonant Shape Frequency Modulator Resonance Modulator Shape Modulator
Brilliance analog ? no band pass (+-7dB at 5kHz) no no no
VCF analog ? yes low pass VCF-EG no no


Name Level Rate Loop Polarity Trigger Level Modulator Rate Modulator
EG - R no no key no no
PolysynthEG - switch:A no no key no no
VCF-EG sustain attack decay release no no key no no


Name Waveform Delay Polarity Sync Delay Modulator Level Modulator Rate Modulator
Vibrato triangle? yes no no no no no
Tremolo triangle? no no no no no no
Conventional Models
SY-1 SY-2 CS-10 CS-30 CS-30L CS-50 CS-60 CS-80
CS-5 CS-15 CS-15D CS-20M CS-40M CS-70M CS-01 SK10
SK15 SK20 SK30 SK50D SY-20 AN1x