Tape recorders "MP-1" and "MP-2".

Tape recorders and radio tape recorders.The tape recorders "MP-1" and "MP-2" have been produced by the Moscow searchlight plant since 1954 and 1957, respectively. The tape recorder "MP-1" is a device for two-track sound recording and reproduction, working in conjunction with a player and a receiver with an input for connecting a pickup. The MP-1 prefix provides recording from a pickup, radio receiver, broadcasting network, piezoelectric microphone, playback of the recorded recordings through a receiver or amplifier. Ferromagnetic tape of type "C" is used as a carrier. The nominal speed of the sound carrier is 19.25 cm / s, provided that the turntable has a speed of 78 rpm. The nominal output signal level is 1.0 V. The band of recorded and reproduced frequencies is 100 ... 5000 Hz. The duration of the recording on one cassette is about 20 minutes. The intrinsic noise of the set-top box is 50 ... 70 times less than the nominal output level. The set-top box is powered by 127 or 220 V AC. The set-top box does not have a recording level indicator, which is why it was necessary to make several test fragments before starting recording. The plant has produced about 60 thousand set-top boxes.