polar diagram
The M 147 tube microphone has a cardioid characteristic, which tends towards a supercardioid due to the distinctive capsule design. At higher frequencies, the graph becomes more directional. This is very similar to the model on which the design of the discussed microphone was based, namely the U 47 and its successor, the U 47 fet.
Electrical Properties
The impedance converter used in the M 147 Tube is characterized by an extremely low weighted inherent noise of only 12 dB-A / 24 dB CCIR compared to other microphones.
As with the recently introduced M 149 Tube, the new M 147 Tube combines a specially selected three-electrode lamp with modern circuitry. This technology takes full advantage of the special handling properties of the tube and transmits the audio signal generated and processed in the capsule to the microphone output without coloration or unwanted side effects.
The lamp amplifies the signal coming from the capsule by about 10 dB, which prevents interference from other electronic devices. The M 147 has a high output voltage, so it can be used with long cables up to 300m without affecting the signal quality.
filter
The electronic circuitry of the M 147 Tube microphone has a flat frequency response in the range from 20 Hz to over 20 kHz. The sonic properties of a microphone are determined by the properties of the capsule used.
stability in use
Both the capsule and the circuit are shockproof to avoid structural noise. Due to its broad characteristics, the M 147 Tube can reproduce extremely low signals without distortion.
This means that due to its sensitivity, the microphone can also pick up unwanted low-frequency noise, be it structure or wind noise. To avoid possible signal degradation, we offer accessories such as the EA 1 flexible hanger and the W 87 windscreen. If you record your singing in close proximity to the microphone, we recommend using a windscreen that is created when pronouncing the explosive PS 15 or PS tones 20 a.
N 149A power supply
The N 149 A universal power supply works with all AC power supplies and generates voltages from 100 V to 240 V, 50 or 60 Hz. Power is supplied via a standard IEC 320 plug. The only difference between the three available versions of the M 147 Tube is the supplied power cable. Note: The N 149V power pack is fully compatible with the M 147 tube condenser microphone.