Mic Archive
Neumann M 147 Tube
Photo: Neumann, from its manual, p. 1.

Neumann

Neumann M 147 Tube

Large-diaphragm tube condenser, cardioid, K 47 capsule, transformerless output; external N 149 A supply

Type
Condenser
Pattern
Cardioid
Sensitivity
−34 dBV/Pa computed
Self-noise
12 dB(A)
Max SPL
114 dB SPL
Impedance
50 Ω
Rated range
20 – 20k Hz

Frequency response

Angle
Distance

Frequency response: from the manual, p. 9. Free field, IEC 60268-4 (as printed under the graph). Distance not stated. The solid curve is the nominal response; the dashed lines are its tolerance band.

Dashed: outside the rated range, or simulated (other angles and distances). Hover or tap the graphs for values.

Polar pattern

Polar pattern: from the manual, p. 9. Free field, IEC 60268-4. Each curve is drawn on one side only (125 Hz to 1 kHz left, 2 to 16 kHz right); the pattern is taken as symmetric. Rings every 5 dB, centre -25 dB.

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All specs

From the manual
CapsuleK 47 dual-diaphragm large-diaphragm capsule ("M 7 capsule"). German text: "Doppelmembran-Kapsel K 47, die in den legendären Mikrofonen U 47 und M 49 bekannt und berühmt geworden ist („M 7-Kapsel“)".p. 3
Sensitivity−34 dBV/Pa (20 mV/Pa), 1 kHz into 1 kohm rated load. Not stated by the manufacturer: From 20 mV/Pa: 20·log10(0.020).p. 8
Self-noise12 dB(A), IEC/DIN 651. "Equivalent SPL IEC/DIN 651 ... 12 dB-A".
Self-noise (CCIR 468)24 dB, CCIR 468-3
Max SPL114 dB SPL, THD < 0.5% (tube characteristic); also 134 dB SPL, THD < 5%. "Max. SPL (tube characteristic) for THD < 0.5 % 114 dB; for THD < 5 % 134 dB": "THD of microphone amplifier at an input voltage equivalent to the capsule output at the specified SPL". Product page: "distortion rises very slowly to 5% THD for 134 dB SPL. This behavior is intentional".
Signal-to-noise ratio82 dB, DIN/IEC 651 (A-weighted), re 94 dB SPL; also 70 dB, CCIR 468-3. The product page gives "re. 94 dB SPL".
Dynamic range102 dB, amplifier, DIN/IEC 651, THD < 0.5%; also 122 dB, THD < 5%
Output impedance50 ohm, rated
Rated load impedance1000 ohm, rated load
Rated frequency range20 Hz to 20 kHz
PoweringN 149 A mains power supply (included); also N 149 or N 149 V. "The M 147 Tube must only be operated with the Neumann power supplies N 149, N 149 A or N 149 V." The supply's XLR output tolerates 48 V phantom (load about 1 mA).p. 5
ConnectorBinder 8-pin (DIN 45326) on the mic; XLR-3 output on the power supply. "Required connectors: Microphone Binder 8-pin (DIN 45326); Power supply unit XLR 3F".p. 8
Weight460 g
Dimensions57 × 142 mm. "Ø 57 mm x 142 mm": diameter x length.
Supplied accessoriesN 149 A power supply; KT 8 eight-core cable (10 m); SG 2 swivel mount; dust cover; aluminium case. "The M 147 Tube comes complete with KT 8 eight-core microphone cable, N 149 A power supply unit, SG 2 swivel mount and an aluminium case"; a cloth dust cover is included.p. 5
TubeSpecially selected (subminiature) triode as the input stage; about 10 dB gainp. 4
Output stageTransformerless; peak output ±10 V at 20 mA
Max. output voltage8 dBup. 8
Cable lengthAudio cable up to about 300 m; the 8-core cable between mic and supply up to about 100 mp. 7
Warm-upThe tube reaches its stable operating condition within a few minutes at the latestp. 5
HeadgrilleA slightly smaller version of the U 47 headgrille; capsule and circuit decoupled from the housingp. 3
Self-noise (maker)3 to 5 dB lower than comparable tube microphones
VersionsEU (cat. no. 008435), US (008434), UK (008436); matte nickel; the versions differ only in the supply's mains cablep. 6
Selected accessoriesEA 1 elastic suspension, WS 87 windscreen, PS 15 / PS 20 a popscreens, MNV 87 auditorium hanger, DS 120 double mount, IC 3 mt cablep. 11

Documents

Copies kept by Mic Archive, because manufacturers move and drop their documents. Each is © Neumann, unchanged, with its original address.

Product page on neumann.comRecording Hacks

Recommended for

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