Universal switch for the "UPM" tape recorder.
Service devices.The universal switch for the "UPM" tape recorder has been produced since 1977. Universal switch "UPM" provides switching of five external sound programs, with adjustment of the signal level to the common 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 AF amplifier of any one of the five devices.
