THE REAR PANEL
do you have a wide array of tones
available from the preamp chan-
nels, but you can introduce any
amount of power tube distortion
you wish, all preset and automatic.
One special note: The lower the
power setting for any channel, the
less preamp gain you will want to
use. So reduce the channel gAIN
control and increase the channel
MASTER as you reduce the power.
You will be much more pleased
with the results, trust us.
RECORD OUT:
This output is
designed as a direct feed to a PA
mixer or for recording. The output
is specially filtered to simulate the
response of a microphone placed
at the edge of the cone of a 12”
speaker. As we all know the ideal
spot to mic a speaker is at the edge
(not the center) of the cone, right?
TUBE BIASING:
This neat fea-
ture allows setting the bias properly
when an authorized technician
changes the power tubes. PLEASE
read the detailed section on TUBE
BIASINg later in this manual to
fully understand its function. This
is important stuff for your safety
and the life of your amp. Don’t
mess around until you understand
how the Tube Biasing works and
only have an authorized service
center replace or check tubes.
SPEAkER OUTPUTS:
This is
where you connect your amp to
your speakers. Let’s start with a
few really important precautions.
1)
NEVER, EVER operate your
amp without speakers plugged in.
This is a terrible thing to do to any
tube amp and can cause severe
damage to power tubes and trans-
formers.
2) Always set the rear panel imped-
ance selector switch to match the
total impedance of your cabinet(s).
The correct setting for the 4212
combo using only the internal
speakers is 8 ohms.
3) Always use a good quality,
heavy gauge speaker cable (not a
shielded guitar cable) to connect
your 4100 head to the cabinet(s).
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