MV 691
Primary use:
Type:
Polar patterns:
Common name: Microtech Gefell MV691
Production Status: Discontinued / Vintage
The MV 691 microphone amplifier was first produced in 1973 as a successor for the MV 690 and was part of the SMS (Studio Microphone System) 70 series. It is a transformer coupled FET transistor microphone body (no feedback circuit) developed by Siegfried Thiersch then development engineer at Gefell (RTF VEB MTG) in cooperation with the RFZ Berlin (Rundfunktechnisches Zentralamt Berlin). The MV691 can use several capsules: M 93, M 69, M 70, M 71, M 72, M 73, M 79, M 94 and the multi-pattern UM 70. It can be powered by the N 690, N 691 or N 692 power supply units via a C 61 7-pin cable. Specifications shown refer to the M58/M93 omnidirectional capsule. The Radio version of the MV6 91 was called M 792.
Electrical Characteristics
Frequency Response
30Hz - 20 kHz
Output Sensitivity
10 mV/Pa
Max SPL
130
Max SPL, THD:
0.5
Self Noise (CCIR)
dB
Self Noise (DIN/IEC)
dB-A
Output Impedance
200Ω
Recommended Load
Powering
Proprietary unit
Supply Current
2 mA
Alternative Powering
Switchable Options
Pad
10 dB
Filter/EQ
Physical Characteristics
Connector
Microtech Gefell NS 84 7-pin male
Connector notes
Available Colours
Bronze. Black.
Weight
135 g
Length
132 mm
Min diameter width
Max diameter
25 mm
Depth
Accessories
Included
Microphone Box
Optional
ST72 -10 dB Pad. TS 68 Tripod table stand. MH 68 microphone holder. TS 69 marble table stand. MH 43 microphone holder. ME 69 gooseneck cable. W 68 windscreen. W 70 windscreen.