to decrease gain. Selection of the gain range is made with the
+20dB gain switch. You may control two ranges of gain with this
control, +26 to +60dB and +6 to +40dB. When setting the Gain
control, refer to the 4 segment Tube Drive Array for a visual refer-
ence to the Tube PAC’s internal signal levels (applied gain). H
Hiin
ntt:
the “sweet” spot for the Tube PAC is when the second warm LED
in the Tube Drive array is lit.
G
Ga
aiin
n SSw
wiittcch
h
Use the Gain switch to set the range of the Gain control. When the
switch is in the out (0db) position the gain range is +6 to +40dB.
Depressing the switch adds 20dB of gain. With the switch in, the
gain range is +26 to +60dB. With most microphone applications
you’ll find using the Tube PAC with the +20dB gain switch in is
needed. Use the setting that best fits your application.
PPh
ha
an
ntto
om
m PPo
ow
weerr SSw
wiittcch
h
The Tube PAC can power any microphone n48 volts DC
phantom power. Consult your microphone’s documentation to see
if phantom power is required to power it. Phantom power is turned
on and off with this switch and supplies power to pins 2 and 3 of
the XLR input jack. It is best to have phantom power turned off
when connecting microphones to the Tube PAC.
N
No
ottee: Be sure to turn down or mute the output of the Tube PAC
when engaging or disengaging phantom power. Additionally,
when disengaging, allow 30 - 45 seconds for the power to com-
pletely 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.
A
An
no
otth
heerr N
No
ottee: MOST dynamic microphones should not be affect-
ed or damaged if they are plugged into the Tube PAC when phan-
tom 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!
7
