Microtech Gefell UM 900

Studio Microphone; switchable classical tube microphone with M 7 double membrane capsule


Microtech Gefell UM 900

  • condenser microphone
  • omnidirectional, wide cardioid, cardioid, supercardioid, figure 8
  • large diaphragm capsule
  • PVC diaphragm
  • tube pre-amplifier
  • phantom powering P48


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 membranes.

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 announcer microphone where its proximity effect is desirable.

technical data

Polar pattern omni, wide cardioid, cardioid, supercardioid, figure 8
Acoustic operating principle Pressure gradient transducer
Frequency range 20 Hz to 20.000 Hz
Sensitivity at 1 kHz 25 mV/ Pa, cardioid 40 mV/Pa
Level selector switch -10 dB / cardioid +4 dB
-10 dB
Output impedance 30 Ohm
Noise level CCIR 468-4 26 dB
DIN EN 60268-4 16 dB-A
Signal-to-noise ratio CCIR weighted 68 dB
A-weighted 78 dB
SPL for THD 0,5 % 130 dB
with 10 dB pre-attenuation 140 dB
Dynamic range 114 dB
Current consumption 4 mA
Tube (low-noise) sub-miniature tube
Output connector XLR3M
Weight 900 g
Length 200 mm
Diameter 75 mm
Surface satin nickel, dark bronze

product contents

with microphone holder MH 80 in a wooden case 250 mm x 175 mm x 110 mm