ART Pro Audio Tube PAC - Tube Mic Preamp/Compressor - Manual (Page 12)

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The Power switch supplies and removes power from the unit. The
Tube PAC should be turned “on” only when all monitor levels are
turned down, or off, to protect against any “thumping” caused by
high gain settings. Likewise, the Tube PAC should be turned “off”
after turning all monitor levels down.
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The Tube PAC’s XLR connectors follow the AES standard:
Pin 1 = Ground, Pin 2 = Hot (+), Pin 3 = Cold (-). The unbal-
anced 1/4” phone jacks are typical Tip = Hot (+), Sleeve =
Ground.
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One input jack per channel should be used at a time. However,
because of its design, the Tube PAC can be hard-wired without
having to disconnect the XLR inputs when using the 1/4” jacks. If
no load is placed on the XLR input (no instrument or microphone
connected) the 1/4” jack will function as if there was nothing con-
nected to the XLR input.
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Both balanced and unbalanced output connections may be used
simultaneously. This is particularly useful when using the Tube PAC
as a direct box for instruments or line level signals.
N No ottee: If you experience a hum when using both output connectors
simultaneously (one to the console and one to an instrument
amp), a ground loop may be the problem. To remedy this prob-
lem, disconnect the ground wire (pin 1) from the XLR cable
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