Model 2BA-221 Microphone Preamplifier
9
Basic Operation
Basic Operation
Important:
For proper
operation of the
2BA-221 (or any vacuum
tube device for that
matter), allow the unit to
warm up with power on
for 15 minutes before
use.
Important:
Do not block
the cooling holes and
allow adequate
ventilation.
Just Plug-in & Go
1.
Plug your favorite microphone into the rear panel
Mic Input
jack, plug your instrument into the front panel
Hi-Z Input
, or
your line level device such as a CD player into the rear panel
Line Input
jack.
2.
Connect either the rear panel
XLR
or
1/4” Output
to the
input of your mixer or recorder.
(Both outputs are balanced.)
3.
Adjust the
Mic
and
Line/Hi Z Level Gain
control so that the
amber LED is lit most of the time and the red LED only lights
occasionally.
4.
Adjust the
Tube Output Level
for an optimal signal level.
5.
Adjust the front panel
Mic Impedance
control to match your
microphone.
If in doubt, set the control for 10K ohms.
6.
That’s it!
Tips
•
Use the Line/Hi Z gain control for solid state sound.
Turn up the tube gain for more tube sound.
•
Turn the tube output gain fully counter clockwise for full
solid state output.
•
Turn the solid state gain control fully counter-clockwise,
then turn up the tube output to about 2 o’ clock. Turn up
the solid state gain control to overdrive the tube.
•
If you want more distortion but the gain is too high for your
recording device, try using the –10dB balanced output.
