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M-147Tube / 钮曼 Neumann 电子管电容话筒 心型指向N 149电源 电源电缆 KT 8话筒线
类别：录音话筒
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详细介绍：
专业录音室麦克风最理想的选择m 147 tube！它是具有心型指向性特点的真空电容录音话筒，其核心部分是k47/49双振膜传感器，继袭了该模式的前身u47和m49的特点 。与所有neumann tube 录音话筒一样，m147tube有精致光洁的镍面外表，整套录音话筒装在铝盒中，这包括麦克风、麦克风连接、一个金属旋转座和一个提供标准插座的小型万用电源。m147tube有很长的话筒电线，但这不会影响到声音质量。它是适用于各种型号音乐设备的超薄现场录音话筒，其低内部杂音使它适于在录音电路、模拟和数字设备上使用，特别适合独奏、特别是弦乐、风琴、和钢琴现场使用。
特点：
常用的电子管录音话筒；
有继承自u47和m49的带大振膜传感器的压力梯度变频器；
与新近推出的m149电子管相似，新m147电子管有一个特别精选的新型电路的真空电子管，该技术充分利用了电子管独有的转移特性，并传送?处理过的传感器声音信号到录音话筒输出装置中，而不会有任何走样。电子管能将传感器的信号增强约10db ，这样能阻止来自电子仪器的任何可能的干扰。m147电子管能传送较高的输出电压，因此能为录音话筒提供达300m长的录音话筒电线而信号不会减弱。电子管在其使用年限内都具有这些完美的操作性能（正极电流和预热电压）。传感器输入能测定任何通过传感器电线的电压的下降，并在n149a电源输电线中校正它。
工作范围极广，它能摸拟极低的频率信号而不会变调，但这同时也意味着录音话筒对结构噪音或风声的低频干扰很敏感，为避免信号衰减发生，配有 ea1防震架和ws87防风罩。
金属头罩样式是u47的小号版，能有效保护传感器免受爆破音与风声的干扰。
无变压器电路；
极低的自身杂音；
n149a电源可提供从100v到240v的ac （交流）电压，电线通过一个标准的iec320电线插座与电源连结。
技术指标：
·声音操作原理：压力梯度传感器
·指向性：心形
·频率范围：20hz-20khz
·灵敏度：20mv/pa
·输出阻抗：50Ω
·负载阻抗：1000Ω
·灵敏度（ccir 468-3）：24db
·灵敏度（din/iec 651）：12db-a
·信噪比（ccir 468-3）：70db
·信噪比（din/iec 651）：12db-a
·声压级（电子管特性）：
·小于0.5%thd(<5%thd)：114（134）db
·最大输出电压：8dbu
·麦克风传感器动态范围：
·din/iec 651（小于0.5% thd） ：102（122）db
·电源：电源供应n149a
·麦克风连接：din 8f
·麦克风连接电源：xlf 3f
·重量：460克
·直径：57毫米
·长度：142毫
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.
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.
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