Microtech Gefell UM 92.1 S (switchable polar pattern)

Microtech Gefell UM 92.1 S (switchable polar pattern)

The UM92.1 S studio microphone features our classic M 7 capsule which is renowned for its sound quality. This pressure gradient transducer uses two large diameter gold-plated plastic diaphragms.
The capsules are selected for optimum polar response. Three directional characteristics (omni, cardioid and figure 8) can be selected with a pattern selector switch integrated into the power supply. This vacuum tube microphone has a remarkable signal-to-noise ratio and high sensitivity.

The UM 92.1 S has the typical full bodied sound of tube microphones that are preferred by vocalists and soloists. The direction of maximum sensitivity is perpendicular to the microphone's axis (side addressed). The vacuum tube preamplifier is a well-established design equipped with a pentode working as high μ triode selected for its sonic characteristics.

The UN 920.1 power supply provides the polarization voltage for the capsule and the necessary DC voltages for the microphone's preamplifier. 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 UN 920.1 can be powered from AC mains with a primary voltage of 115 or 230 volts / 50 or 60 Hz. The pattern selector switch and the on/off-switch are located on the front panel. The AC mains connector (with choice of voltage), the 7-pin Tuchel connector that powers the microphone and the standard 3-pin XLR connector for audio output are located on the rear panel.

The microphone is available in a satin nickel or a black matte finish.


  • The microphone UM 92.1 S in Suitcase    L x B x H   450 x 350 x 160 mm
  • Power supply UN 920.1
  • Connection cable C 92.1
  • Elastic suspension EA 92
  • Windscreen W 92, anthracite
  • satin nickel
  • black matt


  • Tube-Condenser Microphone:  UM 92.1 S
  • Polar patterns:  omni, cardioid, fig-8
  • Acoustical operating principle:  Pressure gradient transducer
  • Frequency range:  40 Hz - 18 kHz
  • Sensitivity at 1 kHz:  15 mV / Pa
  • Rated impedance:  200 ohm
  • Equivalent loudness level (due to inherent noise):  CCIR 468-4 25 dB; DIN EN 60651 17 dB - A
  • Signal-to-noise-ratio (re. 1 Pa at 1 kHz):  CCIR-weighted 69 dB; A-weighted 77 dB
  • Max. SPL for THD 0,5 %:  120 dB
  • Total dynamic range of the microphone amplifier:  103 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:  430 g
  • Dimensions (L x Ø):  197 mm x 42 mm

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