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Power Supplies
Power Supply N 149A (for M147/149/150 Tube)
The N 149 A power supply generates the necessary operating volt-
ages for M 147Tube, M149 Tube or M150Tube microphones. It
operates with all mains voltages from 100 V to 240 V, 50 or 60 Hz.
Mains power is connected through a standard IEC 320 socket. The
microphone connects via an DIN-8 connector. The microphone sig-
nal is fed to a XLR 3 M connector. The modulation output is bal-
anced. The N 149A supplies the bias voltages for the microphone
capsule, the filament voltage controlled by a sensor circuit, and a
further voltage to generate the plate voltage and other necessary
operating voltages within the microphone itself. The unit produces
constant current effecting a soft start of the tube. The KT 8 cable
between microphone and power supply can be up to 100 m long.
Modulation cable lengths up to approx. 300 m are allowed.
The three available versions of the N 149 A just differ in their en-
closed mains power cable.
Mains voltage Euro ..................... 230V/50 Hz
Mains voltage US........................117V/60 Hz
Mains voltage UK ........................ 240V/50 Hz
Output voltages ......................for M149Tube
Power plug....................................Euro/US/UK
H x W x D .......................... 90 x 100 x 145 mm
Weight approx. .....................................1.5 kg
N 149 A EU ...........blk........ Cat. No. 008447
N 149 A US ........... blk ........ Cat. No. 008446
N 149 A UK........... blk ........ Cat. No. 008448
Matrix Amplifier MTX191 A (for RSM191 and AK 20/40)
The MTX 191 A matrix amplifier is used for processing the MS mi-
crophone signals of the RSM191 shotgun stereo microphone, or
the active capsules AK 20 and AK 40. The level of the side signal is
variable, independent of which output mode is selected (MS or XY).
It is adjusted through a rotary switch in 3 dB steps from -9 dB to
+6 dB, relative to the level of the middle signal. Consequently the
pickup angle is varied in steps between 60° and 170°.
Depending on the position of the rotary switch on the front of the
matrix amplifier the output provides either an MS- or XY-signal. The
XY-signal is obtained from the MS-signal by summation (X = M + S)
or subtraction (Y = M–S). In both modes an electric left-right-in-
version is alternatively possible if during the recording the micro-
phone is turned upside-down.
To suppress low frequent interfering noise the matrix amplifier has
a switchable high-pass filter at 40(LIN)/80/200 Hz. The power for
both matrix amplifier and microphone, is either supplied by a 9 V
battery (IEC 6F22), or through external 48 V phantom powering.
The RSM 191 is connected with the 7-pin KT 5/KT 6 cables. Two
AK... active capsules can be connected with an AC 30 cable. The au-
dio is passed through a XLR 5 M connector. The output signal is
DC-free. Use AC ... adapter cables to connect the audio to unbal-
anced inputs.
Operating voltage........................... 9 V or P48
Battery .................................... IEC 6 F 22, 9 V
Side signal.................. variable –9 dB...+6 dB
in 3 dB steps
(pick-up angle 60°...170°)
Output .............................switchable MS or XY
High-pass filter............... 40(LIN)/80/200 Hz
Weight.......................390 g (without battery)
H x W x D ............................. 37 x 80 x 145 mm
MTX 191 A...........blk........ Cat. No. 007331