ART Pro Audio TPS II - Tube Preamplifier System - Manual (Page 7)

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TPS II™ Front Panel Features
PHANTOM POWER +48V SWITCH
The TPS II  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. The TPS II
 will slowly apply
and remove the +48volts, to prevent damage to microphones.
Be sure to turn down or mute the output of the TPS II
 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
Phantom power is disconnected, but some can make some very nasty
low rumbles and whines as well.
Dynamic microphones should not be affected or damaged if they are
plugged into a line where Phantom power is present. However, if the
mic doesn't need it, do not use it. Some things are best left untested!
PHASE REVERSE SWITCH
The Phase Reverse switch is provided to reverse the phase of the
signal. This switch works on Pins 2 and 3 of the XLR output jack and