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TUBE COMPOSER T1952
expander/gate section can be used as an independent unit to eradicate noise offering almost limitless
possibilities within this application.
IGC (Interactive Gain Control) peak limiter
A further remarkable feature of the BEHRINGER TUBECOMPOSER is the IGC (Interactive Gain Control)
limiter, an intelligent combination of a clipper and a program limiter. Above an adjustable threshold the peak
limiter begins to function and restricts signal peaks radically (clipper). If, however, the threshold of the limiter
was surpassed for more than a few milliseconds, the IGC circuit automatically kicks in and reduces the level
of the overall output signal so that no audible distortion occurs (program limiter). After the level falls below the
threshold, the signal returns to the original value after a period of about 1 second. This IGC circuit proves to be
extremely valuable as much for live work (loudspeaker protection) as for digital situations, where any extreme
signal peaks would exceed the maximum headroom and therefore would cause severe problems.
The TUBECOMPOSER uses 12AX7 / ECC83 tubes. These triodes are capable of handling a large dynamic
range with little microphony. Add to this their relative ruggedness and above average life span and you can see
why its one of the most popular and reliable pre-amp tubes on the market. These features also ensure you
their availability for many years to come.
Balanced inputs and outputs
As standard, the BEHRINGER TUBECOMPOSER is installed with electronically servo-balanced inputs and
outputs. The new 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).
Transformer-balanced outputs (optional)
In contrast to electronic balancing, the use of transformer-balanced outputs offers the advantage of galvanic
separation between units. Electrical potential differences and ground loops in audio installations do not there-
fore impair the performance of the units. The transformer-balanced outputs, commonly used in radio and TV
engineering, can also be fitted retrospectively upon request. The BEHRINGER transformer OT-1 is designed to
the highest exacting standards and is available as an accessory.
1.2 Before you get started
Your BEHRINGER TUBECOMPOSER was carefully packed in the factory and the packaging was 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.
+ If the unit is damaged, please do not return it to us, 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.
The BEHRINGER TUBECOMPOSER fits into two standard 19" rack units of space (3 1/2" / 89.5 mm). Please
allow at least an additional 4" depth for the connectors on the back panel.
+ Be sure that there is enough space around the unit for cooling and please do not place the
TUBECOMPOSER on high temperature devices such as power amplifiers etc. to avoid over-
heating.
The mains connection of the TUBECOMPOSER is made by using the supplied mains cable. It meets all of the
international safety certification requirements. Please make sure that all units have a proper ground
connection.
+ Before you connect your TUBECOMPOSER to the mains, please make sure that your local
voltage matches the voltage required by the unit!
As a standard the audio inputs and outputs on the BEHRINGER TUBECOMPOSER are fully balanced. If
possible, connect the unit to other devices in a balanced configuration to allow for maximum interference
immunity. The automatic servo function detects unbalanced connections and compensates the level difference
automatically (6dB correction).
1. INTRODUCTION