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Microtech Gefell UM900

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Tube Multipattern Condenser Microphone with 48v phantom powering

 

Tube Multipattern Condenser Microphone with 48v phantom poweringThe 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 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 tailored to a wide variety of applications. For example, the microphone can be used as an overall pickup for a large orchestra or it can be used as a solo or spot mike for individual instruments. It may also serve as an announce microphone where its proximity effect may be 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 which prevents mechanical vibration interference. This gives the microphone a clean, colorless sound characteristic.

The internal vacuum tube amplifier of the UM 900 can be powered by any external 48 volt phantom supply which 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 UM 900 can be connected with a cable of up to 150 m length without any effect on sound quality.

 

Switching Function

All switches can be turned continuously left or right without stops.

 

Polar Patters

The microphone features 5 pickup patterns: omni, wide cardioid, cardioid, hyper cardioid , figure 8.

 

Level Adjustment

3 positions are selectable: 0, -10, +4

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.

 

Reduced Bass Roll-Off

2 positions are selectable. The sensitivity at 70 Hz is reduced by 10 dB in the position

 

Features

-Large diameter dual membrane capsule, switchable

-Characteristic: Omni, Wide cardioid, Cardioid, Hyper cardioid, Figure 8

-Balanced output transformer

-Level reduction pad 10dB

-Level increase gain 4dB

-Bass roll-off switch

 

 

Available options (please contact us):

-EH 92 elastic suspension

-dark bronze finish

 

 
Tube Condenser Microphone, Phantom P 48
UM 900
Polar patterns omni, wide cardioid, cardioid, hypercardioid, fig-8
Acoustical operating principle
Pressure gradient transducer
Large diameter membrane capsule
dual membran
Frequency range
40 . . . 18000 Hz
Sensitivity at 1 kHz
25/ cardioid 40 mV/Pa
Level selector switch
- 10/ cardioid +4 dB
Switch position "reduced bass roll-off" at 70 Hz
- 10 dB
Rated impedance
30 Ω
Equivalent loudness level
due to inherent noise
CCIR 468 - 4
26 dB
DIN EN 60651
16 dB - A
Signal - to - noise ratio
( re 1 Pa at 1 kHz )
CCIR - weighted
68 dB
A - weighted
78 dB
Max. SPL for THD ≤ 0,5 %
130 dB
with 10 dB preattenuation
140 dB
Total dynamic range
114 dB
Current consumption
( P 48, DIN 45596, IEC 268 - 15 )
4 mA
Sub - miniature valve
low noise version
Output connector
3 - pin XLR connector, goldplated contacts
Weight
900 g
Dimensions ( L x Ø )
200 mm x 75 mm
Finish
satin nickel, dark bronze
 

 

Frequency Responses

 

Omni Wide Cardioid
Cardioid Hyper Cardioid 
Figure 8
freq_3 freq_3 freq_3 freq_3 freq_3

 

Polar Patterns

 

Omni Wide Cardioid Cardioid Hyper Cardioid Figure 8
pol_1_k pol_4_k pol_8_k pol_10_k pol_13_k

 

Gefell's reissue of a historic Neumann mic, made in the same factory as the original, exudes class — and has a price to match...

Sound On Sound

Read the complete review here

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