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The MDAD-1 bi-gradient microphone was produced presumably since 1965 by the Tula Octava plant. Keenly directed. Designed for radio studios or recording studios. Structurally consists of 2 microphones "MD-44". The frequency range is 150 ... 8000 Hz. Load resistance 250 Ohms. Dimensions 35x150 mm. Weight with stand 1.2 kg.