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The dynamic microphone "MD-47" from I quarter of 1962 was produced by the Tula Association Octave. Dynamic microphone "MD-47" is intended for amateur sound recording in conjunction with household tape recorders. The sensitivity of the microphone at a load of 0.5 Mom and a frequency of 1000 Hz is not less than 15 mV / m2 / n. The non-uniformity of the frequency response in the working sound frequency range of 100 ... 10,000 Hz is no more than 20 dB, and in the range of 1000 ... 10,000 Hz, no more than 12 dB. The microphone "MD-47" is non-directional. The microphone dimensions of the MD-47 microphone are 94x71x32 mm. Weight - 200 gr. In 1970, the microphone output was replaced with a modern one.