ART TUBE MP
Owner's Manual

Input Control

Controls, Switches and Indicators:

output to a maximum of +10dB of gain. This gain is in addition to the existing input gain. Power/Peak L.E.D. When power is applied to the TUBE MP the Power/Peak L.E.D. lights green. This L.E.D. also serves as the signal clip indicator. If too much signal is present this L.E.D. lights red. If the L.E.D. is constantly lit, reduce the signal level with the Input Control. The clip L.E.D. is positioned at the tube's output in the circuitry and lights when a level 6dB below hard clipping dB is reached.

The input control sets the amount of input Gain of theTUBE MP Turn the control clockwise to increase gain and counterclockwise to decrease gain. You may control two ranges of gain with this control, +26 to +6OdB and +6 to +4OdB. Selection of the gain range is made with the +20dB Gain Switch. +2OdB Gain/Norm Switch Use the +2OdB Gain/Norm switch to set the gain range of the Input control. When the witch is out, theTUBE MP operates in Normal mode Depressing the switch adds 20dB of gain. This mode is indicated by the labeling in red and corresponds directly to the Input control�s red gain range labeling For microphone applica-tions, where more level is needed, push the witch in. P-Pwr +48V/Out Switch Use theTUBE MP�s phantom power to supply power to all microphones requiring +48V phantom power. The TUBE MP's Phantom power is engaged and disengaged with this witch Phantom power is applied to pins 2 and 3 of the XLR Input jack when this switch is pushed in. To disengage phantom power, position the switch in the out position. Power Phase Reverse/Norm Switch Phase Reverse/Norm Switch To set the phase of the TUBE MP�s output signal, �se this switch. When the switch is in the Out position the output signal is normal. Depressing the switch reverses the phase of the output signal. In multi-microphone applications, mic placement can affect the phase of the signals If your sound is �thin� or "out of position,� reverse the phase to correct the problem. Output Control The output control sets the output level of the TUBE MP. When the control is fully counterclockwise the output level of the TUBE MP is zero. Turning the control clockwise increases the level of the

Product Description
A RT�s TUBE MP circuitry is a hybrid design utilizing the latest and best solid state and tube technology, Using a transformerless design throughout the TU BE MP maintains cxccptional signal mtegrity and extremely low noise. T h e active balanced input utilizes a hybrid multiple paired transistor/opamp design providing extremely low noise and excellent CMRR. The instrument input has a high impedance preventing the loading of any device connected to it. Phantom power is derived from the incoming AC voltage. The XLR output is active balanced and the 1/4" output is unbalanced with a 300 ohm impcdance.

Applications:
The main application of the TUBE MP is a microphone preamplifier. Plug any microphone directly into either input and set the Input and Output controls to provide a healthy level into the next stage of your system. Use the TUBE MP as an acoustic or piezo pickup preamplifier to run directly into a console, amplifier, signal procesor or recorder. You may use the TUBE MP to interface any instrument directly to a live or recording console�s line input, amplifier, signal processor or recorder. The TUBE MP may also be used as a direct box.

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