The M 149 Tube* is a variable dual-diaphragm microphone. The K 49 capsule well-known from the legendary U 47 and M 49 microphones is followed by a tube functioning as an impedance converter. In contrast to earlier concepts utilizing a transformer the tube is complemented with a transformerless output circuit design. The M 149 Tube can thus feed long microphone cables without any coloration. Two slide switches are located below the large, acoustically very open headgrille. The switch at the front allows selection one of nine directional patterns. The slide switch at the rear operates a seven-step high pass filter. It allows a very fine adjustment of the cut-off frequency.