Microtech Gefell UM 900 UM900 "The Phantom"
The UM 900 is the first switchable pattern, valve condenser microphone which can be connected to industry standard 48 volt phantom powering using a normal 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.
Three switches are located around the body of the UM 900. The switch in the front selects the polar pattern: omni, wide cardioid, cardioid, hyper cardioid and figure 8. Located 120 degrees to each side are switches for gain adjust and low frequency roll-off.
The unusual shape of the microphone's body is especially designed to minimize undesirable reflections of sound toward the pickup element.
Acoustic influences which 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 which dampens vibration.
The amplifier uses a specially selected vacuum tube. An internal transverter provides all the necessary voltages.The low impedance output is implemented with an operationalamplifier and balanced output transformer.
The UM 900 can be connected with a cable of up to 150 m length without any effect on sound quality.
The microphone features 5 pickup patterns: omni, wide cardioid, cardioid, hyper cardioid , figure 8.
3 positions are selectable.NOTE: When the "+4" position is selected, the pattern switch on the front of the microphone is disabled. Only the cardioid pattern functions at the higher sensitivity of +4dB.
2 positions are selectable.The sensitivity at 70 Hz is reduced by 10 dB in the position
