Here is a Vintage Electro-Harmonix Electric Mistress Green Logo Flanger Pedal in Very Good condition. Works & sounds great!
Circuit # EH 5100 D
The History of the Electric Mistress
The Electric Mistress was developed by David Cockerell around 1975 and was the first flanger in a stompbox format. It was produced until 1985 with only small changes. It has a Rate, Range and Color knob and a switch to engage the Filter Matrix. It is driven by two 9v batteries or an 18v power supply.
The Filter Matrix
The filter matrix switch stops the LFO and therefore the oscillation. The cancellations then stay at the same frequency what produces metallic-like sounds. With sweeping the Range knob you can change the frequency.