ART Pro Audio TPS II - Tube Preamplifier System - Manual (Page 5)

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INSTALLATION
The TPS II  may be used in a wide variety of applications and
environments. In a rack-mountable, all-steel enclosure, the units are
designed for continuous professional use. Mounting location is not
critical. However, for greater reliability we recommend that you not
place the units on top of power amps or other sources of heat. The
tube circuitry needs about a minute to “warm up” from a cold power up.
AC POWER HOOKUP
The TPS II  has an internal power supply designed to operate at 115
VAC @ 50 to 60 Hz. Units manufactured for use outside the United
States of America have been modified to comply with the required
electrical specifications.
AUDIO CONNECTIONS
Rear audio input connections the TPS II  are balanced XLR (Pin 2 =
Hot (+), Pin 3 = Cold (-), Pin 1 = Ground) and balanced ¼” (Tip = Hot
(+), Ring = Cold (-), Sleeve = Ground).
The front panel combo jack is balanced XLR mic level input, or ¼”
unbalanced instrument level input. When the front ¼” input is used it
bypasses the mic preamplifier, allowing you to keep an active input
plugged into either of the rear input jacks. The instrument input is
ALWAYS high impedance, and is not affected by the input impedance
control.
We recommend that you switch off the +48V Phantom Power
whenever changing connections to the XLR input.
The rear output XLR connectors are balanced (Pin 2 = Hot (+),
Pin 3 = Cold (-), Pin 1 = Ground), while the output ¼”jacks
(Tip = Hot (+),Sleeve = Ground) are unbalanced.