ART Pro Audio TPS II - Tube Preamplifier System - Manual (Page 10)

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OUTPUT CONTROL
The Output Control sets the output level of the TPS II . When the
control is fully counterclockwise, there is no output. Turning the control
clockwise increases the level of the output signal. When setting the
Output level control, refer to the VU Meter for an accurate level leaving
the preamp.
When setting the Output level control, refer to the VU Meter for an
accurate level leaving the preamp. The marking on the output control
determines the meter calibration to output level. If the Output control is
set to –10, then the output of the unit is –10dBu when the meter reads
0 VU. For +4 (pro) systems, set the Output control to +4 and the meter
will be calibrated to your system levels.