MPN #211179    
Gefell M990


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Cardioid large diaphragm vacuum tube condenser microphone

The M 990 is renowned for its high sensitivity and excellent signal-to-noise ratio. It combines modern large diaphragm capsule technology with the typical full-bodied sound of tube microphones that are preferred by vocalists and soloists.

The new pressure gradient transducer of the M 990 uses a large diameter gold-plated plastic diaphragm. The vacuum tube preamplifier is equipped with a pentode working as a triode selected for its sonic characteristics.

The N 920.1 power supply provides the operating voltage for the vacuum tube condenser microphone. It can be powered from AC mains with a primary voltage of 115 or 230 volts / 50 or 60 Hz.

For cable lengths over 50 meters it is recommended to have your service provider set the heater voltage of the power supply to 5.8 volts. The N 920.1 is equipped with an on/off-switch, a 7-pin Tuchel connector that powers the microphone and a 3-pin XLR connector with integrated line voltage selector.

The M 990 is packed in a wooden case and comes with power supply , connection cable C 92.1 and elastic suspension EA 92.

The microphone is available in a dark bronze finish.
  • High sensitivity
  • Excellent signal-to-noise ratio
  • Modern M930 capsule
  • Large diameter gold-plated plastic membrane
  • Tube preamplifier with EF86
  • Polar pattern: cardioid
    Acoustical operating principle: Pressure gradient transducer
    Frequency range: 40 ... 18000 Hz
    Sensitivity at 1 kHz: 28 mV / Pa
    Rated impedance: 200

    Equivalent loudness level due to inherent noise:
  • CCIR 468-4 (qps): 24 dB
  • DIN EN 60651: 13 dB - A

  • Signal-to-noise ratio (re 1 Pa at 1 kHz):
  • CCIR-weighted: 70 dB
  • A-weighted: 81 dB

  • Max. SPL for THD 0,5 %: 119 dB
    Total dynamic range of the microphone amplifier: 106 dB
    DC power supply: 120 V
    Anode current: 1 mA
    Heater voltage: 5,8 V
    Heater current: 200 mA
    Tube: EF 86
    Output connector: 7- pin Tuchel C 70 / A
    Weight: 400 g
    Dimensions (L x Ø ): 185 x 43 mm
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