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Opis proizvoda

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.

Applications

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.

Acoustic features

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.

Polar pattern

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.

Electrical features

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.

Filter

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.

Operational Stability

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.

Tehničke specifikacije proizvoda

  • 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