MD-66 1972
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Dynamic microphone "MD-66" presumably since 1972 produced Tula plant "Octava". The sharp microphone is designed to enhance speech, control, and sound recording. The frequency range of sound is 100 ... 12000 Hz (100 ... 10000 Hz). The MD-66A microphone is distinguished by the absence of a cable, and the MD-66E microphone is capable of working in places with a high electromagnetic field. Microphones were also produced in a tropical version with the letter "T" after the name.
Documentation:
Information from collection of Valery Khartchenko