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Electronic musical instrument "Daina" (Daina) was created in 1954 and was being developed until 1962. In the process of refinement, its schemes were constantly improved and the thermal conditions of the lamps were corrected; in 1963, it won the 2nd prize at the 19th All-Union Radio Amateur Exhibition (the first was not). EMI is a thesis work of the designer of the Riga Radio Factory. Popova - Karlis Grundstein. Characteristics: Polyphonic instrument. The range of 5 octaves. 12 different timbres. Loudness control pedal. Built-in speakers with the ability to connect the amplifier. The EMP consists of 50 radio tubes. Power consumption 120 watts. EMP weight - 40 kg.