ART Pro Audio Tube Channel - Tube Mic Preamp/Compressor/EQ - Manual (Page 9)

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microphones to the Tube Channel.Note: Be sure to turn down or mute
the output of the Tube Channel when engaging or disengaging
phantom power. Additionally, when disengaging, allow 30 - 45
seconds for the power to completely dissipate. 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.Another Note: MOST dynamic microphones should
not be affected or damaged if they are plugged into the Tube Channel
when phantom power is turned on (we haven’t run across any).
However, if the mic doesn’t need it, don’t use it. Some things are best
left untested!
Tube Drive/Gain Reduction Display
Four LEDs display how the tube gain is affecting the input signal.
These LEDs are calibrated with the tube circuitry to give you an
accurate representation of the tube’s output signal (Note: these LEDs
measure the signal level before the output level control). Use this
meter as a visual guide for setting the Gain level. The first LED is
labeled “Cln”. The tube is producing a clean output when this LED is
lit. The next two LEDs are labeled “warm.” This is the optimal
operating range for the Tube Channel’s preamp. At this level, the tube
is producing an output signal that most would term “warm” (Whatever
you would like to call it is fine -- simmering, toasty, etc.) You’ll find
the output signal has an enhanced bottom to low mid quality with
smooth high frequency detail.The last LED is labeled “Clip.” This
LED will light approximately 6dB before audible distortion occurs. If
this light flickers, don’t panic. The unique design of the Tube Channel
allows the tube to distort well before any other gain stage. When a tube
goes into distortion it is a gradual process and tends to sound pleasing
for a range before it turns into a distortion box. After some use you’ll
find that the “sweet spot” of the Tube Channel is when this light
flashes fairly regularly. You may very well find a “clipped” level is
suitable for some applications.Note: Use the Tube Character Array to
aid in setting the Gain Control.
Preamp Output
The Preamp Output control sets the output level of the preamp section
of the Tube Channel. In most situations you’ll be leaving this control
set around 12 o’clock (or its “0” setting). The Preamp Output control
has a range of no output (from its fully counter-clockwise position), to
additional 16dB of gain (when turned fully clockwise).