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BLUE DEVIL GX112
1.1 The design concept
The philosophy behind BEHRINGER products guarantees a no-compromise circuit design and employs the
best choice of components. The operational amplifiers which are used in the BLUE DEVIL, are exceptional.
They boast extreme linearity and very low distortion characteristics. To complement this design the choice of
components includes low tolerance resistors and capacitors, high-quality potentiometers and several other
stringently selected elements.
The BLUE DEVIL uses SMD technology (Surface Mounted Device). These subminiature components adapted
from aerospace technology allow for an extreme packing density to further improve the overall reliability.
The sturdy steel-plate enclosure of your BLUE DEVIL, with its generously dimensioned power supply, ensures
that your GX112 will never faileven under toughest conditions on the stage. The enclosure is made of high-
grade and non-polluting E1-MDF wood, which consists of multiple tongued/glued layers and is absolutely free
of formaldehyde.
1.1.1 VIRTUBE technology
Tube preamps usually employ three to five triode stages in a series configuration, producing different degrees
of distortion, dynamic compression and frequency response modification. In addition to the characteristic
curve that determines the signal distortion, the order of filter and distortion stages also plays an important role.
While you can enhance the sound of clean and slightly distorted signals by adding some bass before feeding
them into the distortion stage, the same equalization will lead to a fuzz-like, undifferentiated sound with
hi-gain signals. For this reason, tube amplifiers have some sort of passive and usually straightforward filter
circuitry installed between the single preamp stages. Using these filters you can determine which frequencies
will have an impact on the signal distortion.
Additionally, filter circuits following the distortion stage serve to provide for an optimum blend of generated
upper harmonics in the output signal. Our VIRTUBE circuits have been designed to accurately simulate this
complex interaction with solid-state components. The EQs and filters between the single stages are modeled
on the circuitry found in classic tube amps. The non-linear characteristic curves are simulated by means of
specially selected diodes. The result is an amplifier whose sounds feature a pronounced tube character.
1.2 Before you begin
Your BEHRINGER BLUE DEVIL was carefully packed in the factory and the packaging is designed to protect
the unit from rough handling. Nevertheless, we recommend that you carefully examine the packaging and its
contents for any signs of physical damage, which may have occurred during transit.
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If the unit is damaged, please do not return it to BEHRINGER, but notify your dealer and the
shipping company immediately, otherwise claims for damage or replacement may not be granted.
Shipping claims must be made by the consignee.
Be sure that there is enough space around the unit for cooling and please do not place the BLUE DEVIL on
high temperature devices such as radiators etc. to avoid overheating.
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Before you connect your BLUE DEVIL to the mains, please make sure that your local voltage
matches the voltage required by the unit!
The mains connection of the BLUE DEVIL is made by using the enclosed mains cable and a standard IEC
receptacle. It meets all of the international safety certification requirements.
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Please make sure that all units have a proper ground connection. For your own safety, never
remove or disable the ground conductor of the unit or of the AC power cable.
The MIDI connection (IN) is made over standardized DIN plug-in connectors. An optocoupler has been used
for isolated data communications.
You will find additional information in chapter 5 INSTALLATION.
1. INTRODUCTION
