Octava MD-41 Russian Soviet Vintage Dynamic microphone USSR 1956

Description

Dynamic microphone "MD-41" was produced by the Tula Association "Oktava" since 1959.
The microphone is intended for Amateur sound recording with household tape recorders.
Inside the microphone there is a microphone output transformer having a transformation coefficient of 25; its primary winding contains 140 turns of PELSHO wire 0.25, and the secondary-3 500 turns of PEV 0.13. The core is made of permalloy tape, rolled ring; the width of the tape 9, the inner diameter of the core 25, and the outer 65 mm.
Characteristics:
The sensitivity of the microphone at 1000 Hz of at least 30 mW/m2/n.
Operating range 100-5000 Hz.
Uneven frequency response in the operating frequency range of not more than 25 dB.
The nominal load resistance 500 ohms.
Dimensions of the microphone "MD-47" - 94h85h63 mm.
Weight - 560 gr.