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The special disc recorder "MAG-D1" (P-181) has been produced since 1957. The tape recorder '' MAG-D1 '' was developed in '' VNAIZ '' and is intended for recording radio telegraph signals of Morse on a ferromagnetic disk for service purposes. The speed of rotation of the disc during recording or playback is variable from 35 to 100 rpm. The recording time is at the minimum speed of 5 minutes, at the maximum 2 minutes. The operating frequency range is variable and varies from 300 ... 5000 Hz at the beginning of the disc to 300 ... 3000 Hz at the end. The tape recorder has a low-frequency narrowband filter that allows you to select a very weak signal during playback. A recording disc is similar to a gramophone record with gaps between the troughs of the treadmill and ferromagnetic material applied to the disc. The magnetic pickup head performed two functions, recording and playback, and the erasing of records was performed by demagnetizing the disc in a separate device.