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last edit: Recording Questions 250 day 23 h
About:
The Neumann M 149 Tube is a Neumann's flagship tube condenser microphone, with a large-diaphragm capsule, 9-way pattern-control switch, and very low self-noise.
The unique Neumann M149 capsule is the Neumann K47 a dual-diaphragm design with center-terminated membranes. This capsule is sometimes also known as the K49. Note that some printed documentation from Neumann states that this microphone uses an M7 capsule. We believe this to be a misprint. (The same mistake exists in the M147 manual.)
The amplifier circuit is similar to that of the M147 Tube; both realize 10dB of gain from the tube in the amplifier circuit, and both use a transformerless output stage.
The circuit design is among the quietest we've seen for a tube microphone. Self-noise varies with polar pattern;
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