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The electric player "UP-4" since 1953 produced the Vilnius plant "Elfa". There is only a small note about the model in Radio No. 5 for 1955. A number of factories of various ministries were instructed to organize the production of universal electric players. But instead of creating new original samples, these plants took as a basis a far from perfect model of the "UP-4" type player, developed by the Elf plant. There are a number of significant drawbacks in this mechanism, the main one being that the DAG-1 type electric motor used in the mechanism is cumbersome, heavy and not technological, and the system of switching the speeds of rotation of the disk is complex and unreliable. The release of the mechanism of the "UP-4" type was allowed temporarily to the factory "Elf" only temporarily and this mechanism could not be a model for numerous variations of the electric player nodes (the mechanisms of the PP-1, two-speed electric motors MP-1 , "MPP-1" and others).