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TUBE ULTRAGAIN T1953
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SERIAL NUMBER. Please complete and return the warranty card within 14 days of the date of
purchase. Otherwise, you will lose your right to the extended warranty. Alternatively, you can register
online at our website under www.behringer.com.
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FUSE HOLDER / VOLTAGE SELECTION. Before connecting the T1953, confirm that the voltage
display matches your local mains voltage. When replacing the fuse, you must always use the same
type. In many units the fuse holder can be installed in one of two positions, allowing you to switch
between 230 V and 120 V. If you wish to operate a unit outside Europe at 120 V, then a stronger fuse
must be used (see chapter 6 SPECIFICATIONS). The mains connection is made via the IEC
receptacle. An appropriate mains cable is included.
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AUDIO IN. These are the audio inputs of your TUBE ULTRAGAIN, available both as balanced 1/4" TRS
and XLR connectors. The XLR connector is the common mic/line input. Both the XLR and the jack
connector accept unbalanced as well as balanced signals. See chapter 5 INSTALLATION when wiring
unbalanced.
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AUDIO OUT. These are the audio outputs of your TUBEULTRAGAIN. Matching 1/4" TRS and XLR
connectors are wired in parallel. The nominal level is +4dBu. The maximum output level is +16dBu.
2. OPERATION
Before you can use the BEHRINGER TUBEULTRAGAIN as a preamp, we recommend that you study the
various functions of the device. The high gain factors provided by the microphone preamp can produce extreme
levels on the output side, which may damage subsequent devices. So, you should start with the following basic
setting:
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+48 V switch OFF
MIC TRIM control 10 dB
MICROPHONE/LINE switch LINE
PHASE REVERSE switch OFF
HIGH PASS switch OFF
LEVEL control 0 dB
Tab. 2.1: Basic setup of the TUBEULTRAGAIN
Reduce the volume level of the subsequent audio system to a minimum, and connect a microphone to the XLR
input connector on the BEHRINGER TUBEULTRAGAIN. Use either the 1/4" TRS or XLR output connectors to
connect the audio system. Owing to its output-side servo-balancing circuit, the TUBEULTRAGAIN detects
whether you use a balanced or unbalanced configuration and adjusts the level internally.
Now, power up the entire equipment and press the MIC/LINE switch upwards to activate the microphone
preamp. If you wish to use a condenser mic requiring +48 V phantom power, please press the +48 V switch.
+ Please make sure that you are using an appropriate microphone before you switch on the
+48 V supply. Read the operating instructions accompanying the microphone. Some condenser
mics might need another type of power supply, older dynamic microphones could be
damaged by the +48 V voltage, and unbalanced microphones should never be operated in
combination with a +48 V power supply.
Configure the equipment according to the application on hand, speak into the microphone and turn the GAIN
control clockwise until the 0dB LED lights up. If your DAT recorder, mixing console or other subsequent
devices have high-precision level meters, you can use these to verify the correct level setting.
The maximum output level depends on the device that follows next in the audio chain, and must therefore be
set specifically. The high-precision level meter on the TUBEULTRAGAIN indicates the current operating level.
The CLIP LED lights up at a level of +18dBu signaling that you have an additional headroom of 5dB available,
before the microphone preamp starts overloading. If distortion/overloading occurs at high volume levels, you
should reduce the gain with the MIC TRIM control.
2. OPERATION