Electronica E-02 Parametrical Equalizier | Электроника Э-02 Параметрический Эквалайзер, 1987, made in USSR

Link: Моно линейка такого эквалайзера в отдельном корпусе

Controls:

• 2x1 Channel | Hz: 64Hz, 250Hz, 1000Hz, 3500Hz, 12500Hz, Master Volume 
• 2x1 Channel: On/Off EQ (byPass) 
• On/Off Power 

Connectors:

• 2 Audio IN on standard 5-pin DIN 
• 2 Audio OUT on standard 5-pin DIN 

The unit is not powered by battery, but only by external 220V.