Product Description

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 M 990 vacuum tube condenser microphone is well-suited for difficult radio play productions as well as a supporting microphone for orchestra recordings.
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 N 920.1, connection cable C 92.1 and elastic suspen- sion EA 92.

The microphone is available in a dark bronze finish.

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Additional Information

Pollar Pattern


Acoustic operating principle

Pressure gradient transducer

Frequency range

40 … 18000 Hz

Sensitivity at 1 kHz

28 mV/Pa

Rated impedance

200 Ω


70 dB

Max SPL for THD 0,5 %

119 dB

Total dynamic range of the microphone preamplifier

106 dB

DC power supply

120 V-

Anode current

1 mA

Heater voltage

5,8 V-

Heater current

200 mA


EF 86

Output connector

7-pin Tuchel C 70/A


400 g


185 mm x 43 mm

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