YAMAHA CO-01 Compressor 1980s Vintage Guitar Effect Pedal Made in Japan

Yamaha CO-01 Compressor was manufactured in 1980s. It is a specification to be incorporated into the YAMAHA PSE system board. There are some scratches, but it still works well almost 40 years after it was manufactured. There is no AC adapter terminal and the main body itself is only driven by a 9V battery because It is a specification to be incorporated into the YAMAHA PSE system board. We have confirmed the sound output with a 9 volt battery. #compressor