Korg 900 PS

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Pics of the inside below.

"This is a rare gem of vintage sound, lovingly restored to bring the 1975 Korg PS-900 back to life. The power supply section has been professionally upgraded with modern components for better performance and reliability, as shown in the latest photos. Apart from this, everything else remains fully original and has been meticulously cleaned. It's in excellent shape, with just a few minor scratches—remarkable for a synth of this age.

There seems to be some confusion about the naming (sometimes called PS900), especially since the face plate says 'Synthesizer Korg Preset.' The 900PS is quite a basic but very interesting monosynth. The 900PS definitely 'borrowed' some ideas from the Pro-Soloist. Instant selection of 29 different tone colors. From the sweet sound of a violin to the chugging of a steam locomotive. Sensitive soft-touch switches and plentiful controls provide a wide variety of effects including vibrato, repeat, even the harmonics you need for a Hammond organ tone.

The PS-900 isn’t just any monosynth. It's a legendary preset synthesizer with 29 pre-programmed sounds that capture the rich, raw character of true analog. While minimal adjustments are possible, you’ll find dedicated sliders for tweaking vibrato, attack, sustain, harmony, and the Traveler Control, which governs the VCF cutoff for classic filter sweeps.

But the real magic lies in the touch bar. This unique feature, positioned at the front of the keyboard, unlocks creative potential like no other. With switches that activate portamento, vibrato, forte, repeat (note retrigger), or pitch (a semitone drop), the touch bar allows you to play with expressive, evolving textures and unexpected twists. It’s a performance feature that truly sets the PS-900 apart.

The 900PS has 29 presets: Timpani, Electric Bass, Synthe Bass, Piano, Harpsichord, Shamisen, Banjo, Mandolin, Xylophone, Tuba, Bassoon, Horn, Cello, Trombone, Saxophone, Voice, Clarinet, Accordion, Trumpet, Funky Trumpet, Synthe Trumpet, Oboe, Violin, Recorder, White Noise, Scale Noise, Harmonics I, Harmonics II, Harmonics III."