Unicord Stage DE-1
The Stage DE 1 (1,2) was a Rack mount Analog Echo and Delay Unit. It had Volume, Balance, Repeat and Delay knobs, high and low inputs/ouputs and a foot switch jack, very similar to the tape based EC-80. Delay went from 15ms to 200ms. Made from about 1977 to 1980.
Copyright Michael Wright, author of Guitar Stories Vol. 2, and Vintage
Guitar Magazine; used by permission.