Hughes & Kettner Red Box Classic Operating Instructions Manual page 11

Operating the Red Box with tube amps,
solid state amps & preamps:
The power amp stage in an all-tube amp is instru-
mental in shaping your guitar amp's tone, which is
why we recommend you tap the power amp speaker
signal (Speaker) when utilizing a tube amp. The
preamp signal (Line Out) is preferable for solid state
amps due to lower noise levels and superior dynamic
response. Always employ the Line Out signal whe-
never using a preamp.
CAUTION!
Never operate an amp featuring a tube power stage
without a connected speaker or a power-soak resis-
tor with a sufficient load! Hughes & Kettner is not
liable for equipment damage caused by erroneous
handling of the Red Box. When in doubt consult
a qualified technician, especially when dealing
with load resistors. Make a habit of connecting the
Speaker Thru jack to your speaker/speaker cabinet
immediately after connecting the amp's Speaker
Out to the Mark III's Speaker In! Ensure the amp
is switched off before you begin connecting cables;
otherwise the Red Box may be damaged. Ensure all
plugs are inserted properly!
Troubleshooting
The Red Box is connected, but no signal is routed
to the Balanced Out jack:
• The Red Box is not receiving power. Insert a 9V
block battery, plug in the proper adapter, or switch
the mixer desk's phantom power on.
11