Microtech Gefell – UM 900

The UM 900 is the first switchable pattern, tube
condenser microphone that can be connected to
industry standard 48 Volt phantom powering using
a regular 3-pin XLR-microphone cable. This is
made possible by an advanced circuit design for
the amplifier and internal power supply.
The pickup capsule uses a traditional, proven
design with two large, gold plated plastic

Acoustic influences that could result from the
housing resonance and/or mechanical vibration are
reduced by the robust construction and by a
special fixture within the microphone's housing that
dampens vibration.


The high sensitivity and low noise of the UM 900 make it especially suitable for vocal and speech pickup in
professional sound recording studios, scoring stages and broadcast studios. The 5 pickup patterns allow the
microphone to be used for a wide variety of applications. E.g. the microphone can be used as an overall
pickup for a large orchestra or as a solo or spot mike for individual instruments. It can also be used as an
announcers microphone where its proximity effect is desirable.


The direction of maximum sensitivity is radial to the microphone body, i.e. side addressed. The front of the
microphone is indicated by the model number and the pattern selector switch.
The pick-up capsule is mounted in a large, acoustically open headgrill that prevents mechanical vibration
This gives the microphone a clean, colourless sound characteristic.


The internal vacuum tube amplifier of the UM 900 can be powered by any external 48 Volt phantom supply
that can provide at least 4 mA of current.
The amplifier uses a specially selected vacuum tube.
An internal transverter provides all the necessary voltages.
The low impedance output is implemented with an operational amplifier and balanced output transformer.


The microphone features 5 pickup patterns: omni, wide cardioid, cardioid, hyper cardioid.


3 positions can be selected.
NOTE: When the "+4 position is selected the pattern switch on the front of the microphone is
disabled. Only the cardioid pattern works at the higher sensitivity of +4 dB.


  • Broadcast
  • Recording


Please refer to the official sales outlets for up-to-date prices.

Microtech Gefell GmbH
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