ART Pro Audio TPS - Tube Preamp System - Manual (Page 4)

CONTROLS & INDICATORS
INPUT CONTROL
The Input Control sets the amount of input gain of the TPS. Turn the
control clockwise to increase gain and counterclockwise to decrease
gain. You may control two ranges of gain with this control, +20 to
+68dB and +0 to +48dB. Selection of the gain range is made with the
+20dB gain switch.
NOTE: This control, along with the +20 dB Switch, is responsible for
any saturation of the tube. To change the tube character, utilize these
2 controls.
+20DB GAIN SWITCH
Use the +20dB Gain Switch to set the gain range of the input control.
When the switch is out, the units operate 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 applications, where more gain is needed,
push the switch in. For hot line level inputs, set the switch in the out
position.
PHANTOM POWER +48V SWITCH
The TPS can power any microphone needing +48 volts DC Phantom
power. Phantom power is supplied to pins 2 and 3 of the XLR Input
jack when this switch is depressed. With the TPS, slowly apply and
remove the +48volts, to prevent damage to microphones.
Be sure to turn down or mute the output of the TPS when engaging or
disengaging Phantom power. Additionally, when disengaging, allow 30
to 45 seconds for the power to completely discharge. Most
microphones will make a sound like air leaking from a tire when
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