Neumann M 147
The M 147 Tube is a vacuum tube condenser microphone
with cardioid characteristic. At the heart of this 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 microphone is delivered as a complete set in a high-quality aluminum case.
Included with the microphone are a microphone cable, a metal swivel mount for a
mic stand, and a compact universal power supply for standard mains sockets. Our
modern manufacturing methods makes it possible to offer this complete set at a
very attractive price.
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.
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.
• 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
Pressure gradient transducer
20 Hz ... 20 kHz
|Sensitivity at 1 kHz into 1
|Rated load impedance
|Equivalent noise level, CCIR
|Equivalent noise level,
|Signal-to-noise ratio, CCIR (rel. 94 dB
|Signal-to-noise ratio, A-weighted (rel. 94
Typical SPL (tube
||114 dB for THD < 0.5
%, 134 dB for THD < 5 %
|Maximum output voltage
|Dynamic range of the microphone amplifier
102 dB for THD < 0.5 %, 122 dB
for THD < 5 %
Power supply N 149 A
Microphone: DIN 8F, Power Supply: