Neumann.Berlin M 147 Tube User Manual

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Product Information
M 147 Tube
Tube Microphone
www.neumann.com
Georg Neumann GmbH • Ollenhauerstr. 98 • 13403 Berlin • Germany • Tel.: +49 (30) 41 77 24-0 • Fax: +49 (30) 41 77 24-50 E-Mail: headoffice@neumann.com, engineering@neumann.com, catalog-info@neumann.com • Web: www.neumann.com
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he M 147 Tube is a vacuum tube condenser micro­phone with cardioid characteristic. At the heart of this mi­crophone is the K 47/49 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 self­noise 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 high­quality 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.
Applications
Features
• 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
Application Hints
• Vocalist mic: its warm and yet transparent sound gives volume and presence
• Announcer’s mic for broadcasting/voice over
• Spot mic for close miking of solo instruments, especially strings, wind instruments, and piano
These are just some of the most common applications. We recommend additional experimentation to gain maximum use from this microphone.
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 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.
Delivery Range
M 147 Tube microphone, N 149 A power supply incl. power cable, SG 1 swivel mount, KT 8 microphone cable, dust cover, aluminium case
Catalog No.
M 147 Tube (230 Volt, EU) ...................................ni ............... 008435
M 147 Tube (117 Volt, US) ................................... ni ............... 008434
M 147 Tube (230 Volt, UK) ................................... ni ............... 008436
Selection of Accessories
Elastic suspension, EA 1 ............................................ ni ............... 008449
Elastic suspension, EA 1 mt ....................................blk ............ 008450
Auditorium hanger, MNV 87 .................................. ni ............... 006804
Auditorium hanger, MNV 87 mt .......................... blk ............ 006806
Table stand, MF 3 .......................................................... blk ............ 007321
Table stand, MF 4 .......................................................... blk ............ 007337
Stand extension, STV 4 ............................................... blk ............ 006190
Stand extension, STV 20 ............................................ blk ............ 006187
Stand extension, STV 40 ............................................ blk ............ 006188
Stand extension, STV 60 ............................................ blk ............ 006189
Popscreen, PS 15 ............................................................ blk ............ 008472
Popscreen, PS 20 a ....................................................... blk ............ 008488
Windscreen, WS 87 ...................................................... blk ............ 006753
Microphone cable, IC 3 mt ....................................... blk ............ 006543
A complete survey and detailed descriptions of all accessories are contained in the accessories catalog
Meaning of color codes: blk = black, ni = nickel
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M 147 Tube
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 and 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.
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 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.
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 20 a pop screen. You will find detailed information in our accessory catalog.
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Technical Data
measured in free-field conditions (IEC 60268-4)
M 147 Tube
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 .................................................................................. 1000 ohms
Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL) .............................................. 70 dB
Signal-to-noise ratio, A-weighted1) (rel. 94 dB SPL) ................................ 8 2 dB
Equivalent noise level, CCIR1)................................................................................. 24 dB
Equivalent noise level, A-weighted1)............................................................ 12 dB-A
Typical SPL (tube characteristic)2):
for < 0.5% THD (for < 5% THD) .................................................. 114 (134) dB
Selection of Accessories
Elastic suspension,
EA 1 (mt)
Table stand, MF 3 (in
connection with stand extension)Auditorium hanger, MNV 87 (mt)
Maximum output voltage ........................................................................................8 dBu
Dynamic range of the microphone amplifier:
(A-weighted) for < 0.5% THD (for < 5% THD) ................. 102 (122) dB
Powering..................................................................................... Power supply N 149 A
Matching connector microphone .................................................................... D IN 8 F
Matching connector power supply ................................................................. XLR3F
Weight.................................................................................................................................460 g
Diameter ......................................................................................................................... 57 mm
Length........................................................................................................................... 142 mm
1)
according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
2)
measured as equivalent el. input signal
Table stand, MF 4 (in
connection with stand extension)
Stand extensions,
STV 4 /20 / 40 / 60
Windscreen, WS 87Popscreen, PS 20 aPopscreen, PS 15 Microphone Cable, IC 3 mt
Adapter Cable, AC 25
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Errors excepted, subject to changes • Printed in Germany • Publ. 01/08 077225/A04
Neumann is a registered trademark of the Georg Neumann GmbH in certain countries.
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