Disk special tape recorder `` MAG-D1 '' (P-181).
Tape recorders and radio tape recorders.Disk special tape recorder "MAG-D1" (P-181) has been produced since 1957. The tape recorder "MAG-D1" was developed by "VNAIZ" and is intended for recording radiotelegraph Morse signals on a ferromagnetic disk for service purposes. The rotation speed of the disk during recording or playback is variable from 35 to 100 rpm. Recording time at minimum speed is 5 minutes, at maximum speed is 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-pass, narrow-band filter that allows you to isolate a very weak signal during playback. A recordable disc is like a gramophone record with tread grooves and ferromagnetic material applied to the disc. The magnetic head of the pickup performed two functions, recording and playback, and the erasing of the recordings was carried out by demagnetizing the disk in a separate device.