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Since December 1955, the Elfa-6 radio tape recorder and radio gramophone produced the Elfa Electrotechnical Plant in Vilnius. A combined device combining a gramophone for playing records at speeds of 78 and 33 rpm and a tape recorder for recording phonograms with their subsequent reproduction. Record two-track, is carried out by moving the node heads in height. The speed of the tape is determined by the speed of rotation of the EPU disk, and also depends on the size of the roll of the receiving coil. The frequency range at a higher speed of 100 ... 5000, less than 100 ... 2000 Hz. When the EPU is working - 100 ... 8000 Hz. Nonlinear distortion 4%. The nominal output power of the amplifier is 1.5 watts. The power consumption of 70 watts from the network.