Here we have a vintage Boss CS-1 Compression Sustainer pedal.  Early Silver screw version. Made in Japan in 1981. The CS-1 is one of the grandfathers of compressor pedals.  Simple controls for Level and Sustain with a two way mode switch for Treble/Normal.  The pedal is tested and working great. Sounds fantastic. It has wear and tear on it cosmetically.  Paint chips, scuffs, scratches, and marks.  Rubber foot pad is in great shape as well as the bottom pad. Serial number 10300. It runs on a 9v battery or a Boss ACA spec ac adapter (not included) Thanks for looking and happy buying!
From Boss Area site….
This is the first Compression/Sustainer pedal released from Boss. It builds on the lagacy of the Roland AS-1. Like all compression pedals it reduces the output of sounds over a set threshold relative to the strength of the input signal, making levels consistent and improving sustain. In the CS-1 this is done by means of photocouplers. The later CS-2 and CS-3 used VCA’s (Voltage Controlled Amplifier) to create the same effect. The sound of the CS-1 is thus very different from its successors.

  • Controls: Level, Sustain, 2 Way Mode Switch
  • Connectors: Input, Output, AC Adaptor
  • Current Draw: 5 mA (DC 9V)
  • Recommended AC Adaptor: ACA Series


  • Black – Made In Japan

The CS-1 was sold from July 1978 to February 1982.

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