The famous capsule, together with complimenting tube characteristics, makes the M 147 Tube especially well suited as a vocal mic. In addition, it is a superb spot mic for all types of musical instruments. The extremely low self-noise of its tube circuitry makes the mic perfectly suited for use in modern recording chains, analog and digital.
The M 147 Tube is addressed from the side, where the microphone body has the diamond-shaped Neumann company logo. The black color identifies tube microphones. The capsule is equivalent to the one used in the U 47, and is the deciding factor in determining the sound characteristic. It has a flat frequency response to the upper midrange, and a boost of up to 3 dB above 2 kHz. The headgrille design is a smaller version of the U 47. It protects the capsule effectively against popping and wind noise.
The M147 Tube has a cardioid characteristic, leaning more toward super-cardioid due to its distinctive capsule design. At higher frequencies the pattern becomes more directional. This is very similar to the model after which this new tube microphone was patterned, the U 47 and the successor, the U 47 fet.
When compared to other microphones, the impedance converter used in the M 147 Tube is distinguished by its extremely low self-noise level of only 12 dB-A / 24 dB CCIR weighted.
Similar to the recently introduced M 149 Tube, the new M 147 Tube combines a specifically selected vacuum tube (triode) with modern circuitry. This technique takes full advantage of the special transfer characteristics of the tube and passes the processed audio signal of the capsule to the microphone output, without any coloration or unwanted side effects.
The tube amplifies the capsule’s signal by approximately 10 dB, thus preventing any possible influences from subsequent electronics. The M 147 Tube delivers a high output voltage, and therefore can feed microphone cables up to 300 m length without signal degradation.
The ideal operating conditions (anode current, heater voltage) of the tube are maintained throughout its life expectancy. A sensor lead detects any voltage drop that occurs through the microphone cable and compensates for it in the N 149 A power supply. The tube warms up gradually using inverse current limiting to guarantee long life.
The electronic circuitry of the M 147 Tube mic has a flat frequency response from 20 Hz to well above 20 kHz. Only the attributes of the capsule determine the typical sound characteristics of the microphone.
Both, the capsule and the entire circuitry are shock mounted to prevent any structure-borne noise. Because of its wide operating range, the M 147 Tube can reproduce extremely low frequency signals without distortion.
This implies that the microphone may also be sensitive to unwanted LF interference by structure-borne noise, or wind noise. To avoid possible signal degradation, we offer the EA 1 elastic suspension and the WS 87 windscreen as accessories. During close miking of vocals we recommend using the PS 15 or PS 20a pop screen.
The N 149 A universal power supply works with all mains AC voltages from 100 V to 240 V, 50 or 60 Hz. Mains power is connected through a standard IEC 320 mains socket. The only difference between the three available versions of the M 147 Tube set is the power cord supplied. Note: The N 149 V power supply is fully compatible with the M 147 Tube microphone.
- Universal tube microphone
- Pressure gradient transducer with the large diaphragm capsule from the legendary U 47 and M 49
- Transformerless circuitry
- Low self noise level
- Comes with swivel stand mount made of metal, universal power supply, and cable in an attractive aluminium case
- Vocalist mic: its warm and yet transparent sound gives volume and presence
- Announcer’s mic for broadcasting dubbing, and voice-over
- Spot mic for close miking of solo instruments, especially strings, wind instruments, piano
- These are just some of the most common applications. We recommend additional experimentation to gain maximum use from this microphone.
- Acoustical operating principle Pressure gradient transducer
- Directional pattern Cardioid
- Frequency range 20 Hz … 20 kHz
- Sensitivity at 1 kHz into 1 kohm 20 mV/Pa
- Rated impedance 50 ohms
- Rated load impedance 1 kohms
- Equivalent noise level, CCIR1) 24 dB
- Equivalent noise level, A-weighted1) 12 dB-A
- Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL) 70 dB
- Signal-to-noise ratio, A-weighted1) (rel. 94 dB SPL) 82 dB
- Typical SPL (tube characteristic)2) 114 dB for THD < 0.5 %, 134 dB for THD < 5 %
- Maximum output voltage 8 dBu
- Dynamic range of the microphone amplifier (A-weighted) 102 dB for THD < 0.5 %, 122 dB for THD < 5 %
- Powering Power supply N 149 A
- Matching connector Microphone: DIN 8F, Power Supply: XLR3F
- Weight 460 g
- Diameter 57 mm
- Length 142 mm
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