Safety Precautions; Powering Up; Front Panel Controls & Indicators; Preamp Circuit - Art Pro Channel User Manual

Safety Precautions

Warning: To avoid the risk of shock or fire, do not expose this unit to moisture. Do not
remove metal panels or chassis parts. Removing any chassis parts exposes dangerous
high voltages. There are no user-serviceable parts inside. Refer all servicing to
qualified personnel. Note: If your power cord becomes damaged, always replace it with
the same type as originally equipped. Since the cord is detachable, it is possible to
replace it with a cord configured for the wrong voltage. Always refer to the unit's rear
panel to determine the correct supply voltage, and choose an appropriate cord.

Powering Up

When the power switch is turned on, the VU meter will illuminate. It is important to
remember to turn the Pro Channel on before any monitoring levels or power amps are
turned on. The Pro Channel has the ability to add over 80dB of gain to its input signal.
This can cause the Pro Channel to produce a "thump" on power up and power down.
Note: Like all tube-based equipment, the Pro Channel needs to warm up before being
used. Allow one to two minutes for the tubes to reach proper operating temperature
before using. If the Pro Channel fails to power up when the power switch is turned on,
check to see that its power cord is plugged into an active outlet. If the unit still fails to
operate properly, turn it off and unplug it. Then consult your dealer or A R T's
Customer Service department.
Front Panel Controls & Indicators

Preamp Circuit

Gain Control

The Gain control sets the Pro Channel's input
gain. Turn the control clockwise to increase
gain and counter-clockwise to decrease gain.
The front panel calibrations (-11dB to +30
dB) refer to the Gain Switch in the "Norm"
position (see next section) with the input
routed to the ¼" unbalanced input jack.
Using the XLR (balanced) input connection
results in 12dB more gain, thus making the
control range from +1dB to +42dB. Selection
of the gain range is made with the +20dB
gain switch. When setting the Gain control,
refer to the upper 10 segment Tube Character
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