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The low-frequency transistor amplifier "ULF-50" has been produced since 1970 by the Vilnius computer factory Amplifier is designed to enhance the sound from various sources. There are six adjustable inputs, with the possibility of mixing signals. Provided for the possibility of connecting two such amplifiers to increase power. The range of working amplified sound frequencies is 20 ... 20000 Hz. Maximum output power 50 watts, rated 35 watts. The amplifier was sold both separately and with speakers like "25KZ-1" or "25KZ-2".