The microphone is probably an OEM version of the Haun / MBHO /Peerless MB-C540, but with 18V power supply from the Dual C901 cassette deck. The jack plug also supplies the micro with power supply.
Connections
Tech nical data
Special equipment
Information on the switching of the input power can be found in the wiring diagram of the Dual C901.
Manufacturer: Dual
Model: MC 312
Years of construction: 1973 - 1977
Color: Silver
Factory price approx.: 198 DM
Capsule is removable, possibly interchangeable.
Stereo jack plug 6.3 mm with 4 m cable, early versions probably only had a mono plug