Neumann M 147 Tube Condenser Microphone
The Neumann M 147 Tube is a vacuum tube condenser microphone with a carioid characteristic pickup pattern, making it especially suited to vocal recording, although its amazing tube qualities also means that it can be used to record pretty much any instrument you want! The Neumann M 147 Tube comes with a high quality aluminium case, a mic cable, a metal swivel mount and a universal power supply. If you want to capture quality vocals, this mic will not disappoint!
- Universal tube microphone
- Carioid characteristic pickup pattern
- Ideal for recording vocals
- Aluminium case, mic cable, metal swivel mount and universal power supply
- Pressure gradient transducer with the large diaphragm capsule from the legendary U 47 and M 49
- Transformerless circuitry
- Low self noise level
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At the heart of the M 147 Tube microphone is the K 47 dual diaphragm capsule, inherited from this model's now legendary predecessors, the U 47 and the M 49.
Following the capsule is a tube that functions as an impedance converter. The next stage is an efficient, transformerless output circuit, that guarantees an extremely low self-noise level. Note: This innovative combination of current tube technology with the most advanced solid-state circuitry was decisive in awarding the 1997 TEC Award to the related M 149 Tube mic.
The M 147 Tube can feed extremely long microphone cables without affecting the quality of the audio signal. Like all Neumann tube microphones, the M 147 Tube comes with an elegant satin nickel finish.
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, analogue and digital.
The M 147 Tube is addressed from the side, where the microphone body has the diamond-shaped Neumann company logo. The black colour 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 M 147 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 M 149 Tube, the 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 colouration 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 300m in 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, Neumann offer the EA 1 elastic suspension and the WS 87 windscreen as accessories. During close miking of vocals we also recommend using a pop screen.
N 149 A Power Supply
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.
Neumann M 147 Tube Specifications
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, A-weighted: 12 dB-A
Signal-to-Noise Ratio, A-weighted (rel. 94 dB SPL): 82 dB
Typical SPL (tube characteristic): 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 %
Diameter: 57 mm
Length: 142 mm
Weight: 460 g