Mayak M-247S and M-247S-1 Tape Recorders
Mayak M 247 S, Mayak M 247 S, and M 247 S-1 tape recorders: produced at the Kiev Mayak plant in small batches in the 1990s.
The Mayak M 247 S double-cassette tape recorder belongs to the second complexity group. It features tone control at five fixed frequencies and a 5-band equalizer.
Single-speed stereo tape recorder with the ability to play back tracks on external Mayak Fifteen AC 222 speakers.
The tape recorder is powered by an AC power supply with a voltage of 220 volts and a frequency of 50 hertz.
The tape recorder is designed for recording from external sources, dubbing, and playback of MK 60 and MK 90 magnetic cassette tapes with magnetic tape types 1 and 2 (iron oxide and chromium).
The nominal tape speed is 4.76 centimeters per second. The average deviation of magnetic tape speed is two percent.
The weighted value of low- and high-frequency flutter is no more than zero point eighteen percent.
The full effective frequency range of reproduction on iron oxide tape is forty to sixteen thousand hertz.
On chrome tape, forty to fourteen thousand hertz.
The unweighted signal-to-noise ratio in the playback channel is not less than forty-six decibels.
The weighted signal-to-noise ratio in the playback channel with the noise reduction system engaged is not less than fifty-eight decibels.
The output power of each stereo channel, limited by ten percent distortion, is not less than eight watts. The long-term maximum output power is not less than twelve watts.
During accelerated dubbing, the tape recorder provides a nominal tape speed of nine point fifty-three centimeters per second with an average deviation of no more than three percent. The full effective frequency range and effective frequency response are within tolerances from no less than forty to twelve and a half thousand hertz.
Power consumption with the speakers on is no more than forty-three watts, and twenty-seven watts with the speakers off.
The tape recorder weighs no more than seven kilograms.
The speakers weigh four and a half kilograms.
The tape transport mechanisms of the LPM A and LPM B tape recorders are mounted on separate chassis made of steel with riveted axles.
The LPM electric drive uses a DP-40 electric motor with a supply voltage of nine volts.
A noteworthy fact: apparently due to the small print run, the back panel was deliberately omitted, but used from the 246, where the 6 was factory-corrected to 7.
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