UPM 1977
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The universal switch for the UPM tape recorder was produced since 1977. The universal UPM switch provides switching of five external sound programs, with signal level adjustment to the general input of the tape recorder. The switch also works in the opposite direction, switching the signal output from the tape recorder to the input of the RF amplifier of any one of the five devices. ,null,ru,null,null,null,null
Information from collection of Valery Khartchenko