Oktava factory is the oldest and major Russian manufacturer of professional studio microphones and other acoustic transducers. Its history dates back to 1927. 

Oktava produces a variety of microphones for professional audio and general use. 

In USSR Oktava equipped Kremlin meeting rooms and the state's biggest TV studio, Ostankino. 
Oktava loudspeakers were installed in large arenas and squares, including Red Square.

Specifications

Microphone dynamic coil omnidirectional MD-271

Also this device may be called: MD271, MD 271, md-271, md271, md 271.

MD-271 dynamic non-directional coil microphone is designed for sound recording and acoustic measurements.

MD-271 microphones is a modification of the MD-271-T.

Technical characteristics of MD-271:

The nominal frequency range is from 50 Hz to 15 kHz.

The sensitivity of the free field at a frequency of 1 kHz - not less than 1.6 mV / Pa.

The deviation of the shape of the frequency response of the sensitivity in a free field from the typical - no more than ± 2.5 dB.

The modulus of the electrical resistance of the MD-271 at a frequency of 1 kHz is from 160 ohms to 240 ohms.

The minimum allowable load resistance is 250 ohms.

Cable length with connector - from 140 cm to 160 cm.

Mass - not more than 170 g.