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TUBE ULTRAFEX T1954
5.1 Rack mounting
The BEHRINGER TUBEULTRAFEX fits into two standard 19" rack units of space. Please allow at least an
additional 4" depth for the connectors on the back panel. Be sure that there is enough air space around the unit
for cooling and please do not place the TUBEULTRAFEX on high temperature devices such as power amplifi-
ers etc. to avoid overheating.
5.2 Mains Connection
Before you switch on the unit, check that it is configured to match your AC mains voltage require-
ments. If it does not comply, then it is necessary to switch the operating voltage to the correct supply require-
ments BEFORE turning on the unit, otherwise the unit could be severely damaged. You will find this combined
fuse holder/voltage selector at the back, adjacent to the IEC receptacle. The AC voltage selection is defined by
the position of the fuse holder. If you intend to change the operating voltage, remove the fuse holder and twist
it by 180 degrees before you reinsert it. Matching the two markers monitors the selected voltage.
IMPORTANT: This does not apply for general export models which are built for one operating volt-
age only.
+ If the unit is switched to another operating voltage, the fuse rating must be changed. See the
technical specifications in the appendix.
+ Blown fuses need to be replaced only with fuses of the correct type and rating! See the tech-
nical specifications in the appendix.
The mains connection of the TUBEULTRAFEX is made by using a mains cable and a standard IEC
receptacle. It meets all of the international safety certification requirements.
+ Please make sure that all units have a proper ground connection. For your own safety, it is
advisable not to remove the ground connection within the units or at the supply, or fail to
make this connection at all.
5.3 Audio Connections
As standard, the BEHRINGER TUBEULTRAGAIN is installed with electronically servo-balanced inputs and
outputs. This circuit design features automatic hum and noise reduction for balanced signals and thus allows
for trouble-free operation, even at high operating levels. Externally induced mains hum etc. will be effectively
suppressed. The automatic servo-function recognizes the presence of unbalanced connectors and adjusts the
nominal level internally to avoid level differences between the input and output signals (correction 6dB).
+ Please ensure that only qualified persons install and operate the TUBEULTRAFEX. During
installation and operation the user must have sufficient electrical contact to earth. Electro-
static charges might affect the operation of the TUBEULTRAFEX!
Critical applications may require to build up a transformer-balanced configuration for the output signals, so as
to avoid interference from ground loops or potential differences. For this purpose, we offer our high-quality
output transformer OT-1 as a retrofit kit.
5. INSTALLATION