via this auction
You can find a demo of one here."Rare JHS SD-1 Pro-Rhythm Analogue Drum Synthesizer from the late 70's from John Hornby Skewes (JHS).
The item has just had a fully service so works perfectly and was from my collection which I am in the process of selling.
The SD-1 is a battery powered drum synth with sound shaping controls and a rubber pad which, when hit, triggers the analogue circuitry for an infinite variety of possible sounds from deep bass to high pitches to sweeping disco tones.
The JHS Pro–Rhythm is a self contained drum synthesizer,featuring two V.C.O.s', a ring modulator, resonance control, L.F.O., white noise source, a sweep generator for oscillators, area V.C.A. Section. Thanks to it's advanced features and state-of-the-art circuitry, the JHS Pro Rhythm offers the modern percussionist an expanded form of electronic musical expression previously available only to guitarists and keyboard players.
The control panel is rim mounted and designed for easy accessibility and fine adjustment, the control themselves are rationally laid out, and easy to operate."
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