Speaker outputs
A speaker must always be connected to your Hundred Duo Twelve, whether it’s the internal 12" speaker or an
extension speaker cabinet. The amp is designed to deliver at least 100 watts to a 4-ohm speaker load. If it has to
drive speaker loads lower than 2 ohms, its output transformer or other components could be damaged. You can use
an 8- or 16-ohm extension cabinet, or two 8- or 16-ohm cabinets (one into each speaker output, with the internal
speaker unplugged). Never use a 2-ohm speaker cabinet or a 4-ohm extension speaker cabinet. The only time you
may run the amp without a speaker connected is if you have a proper “dummy” impedance load box plugged into
the speaker output. Using a dummy load protects the output transformer, but prolonged use shortens the life of the
amp’s output tubes. If you use your Hundred Duo Twelve to drive an extension cabinet, use a heavy-gauge speaker
cord. A shielded guitar cord can’t handle the power that your amp provides, and therefore won’t sound right—plus
it may actually harm your amp. Refer to the connection diagrams on pages 11 through 14 for more information.
Note: Never use a speaker output to connect directly to the input of a mixer, a tape recorder, a
slave amp, or headphones. For further information, refer to the hook-up diagrams on pages 11
through 14 for proper connection with extension speaker cabinets.
Line Out
Your Hundred Duo Twelve can drive another Hundred Duo Twelve, power amp, or other guitar amplifier.
The Line Out is post-power amp, so every bit of tone from your preamp, effects (if used), reverb, and power-
amp circuitry is sent from this jack. Use a shielded cord connected between the Hundred Duo Twelve’s Line
Out and the input to a second amplifier (check that amp’s manual—it may recommend a specific input). The
Line Out can also be used to feed a signal to a tape recorder or mixer. Although the recorder or mixer doesn’t
receive the tone that comes from the speaker, it does receive all of the signal from every other stage of the
amp, and for live-performance recording it does an excellent job of isolating your guitar sound.
Note: Do not connect the Line Out to speakers or headphones. For further information, refer to
the hook-up diagrams on pages 11 through 14 for proper connection.
Footswitch jack
This 8-pin DIN plug is designed to work specifically with the included FS-7 footswitch. Your Hundred Duo
Twelve will function perfectly without a footswitch. However, the footswitch provides a hands-free way to
switch channels and select boost functions. Its three switches control the following:
Channel Select Gain Boost for Channel 1 Ninja Boost for Channel 2
Note: If you are using the FS-7 footswitch, make sure that all pull switches on the amp’s front
panel are pushed in. If any of the pull switches is pulled out, then the corresponding footswitch
function will not operate. Also, the switches and their LEDs are driven by the amplifier’s power;
there is no battery to replace inside the FS-7.
10
9
8
Channel 2
Channel 1
Hundred
Duo Twelve
PULL
SELECT
PULL
BOOST
STANDBY
POWER
LOW
GAIN
HIGH
GAIN
VOLUME
BASS
MIDDLE
TREBLE
MASTER
VOLUME
TREBLE
MIDDLE
BASS
MASTER
REVERB
PRESENCE
HANDCRAFTED BY RIVERA RESEARCH & DEVELOPMENT
SUN VALLEY, CA USA
INPUTS
PULL
BRIGHT
PULL
NOTCH
PULL
NINJA
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CAUTION: NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR.
CAUTION: CHASSIS SURFACE HOT.
ATTENTION: SUPERFICIE DE CHASSI CHAUDE.
TOTAL MINIMUM
Z
4
Ω
FOOTSWITCH
USE FS-7 ONLY
RETURN
LEVEL
SEND
LEVEL
SEND
Z
IN
250K
Ω
Z
OUT
560
Ω
RETURN
EFFECTS LOOP
SPEAKER JACKS
IN PARALLEL
100 WATTS RMS
SPEAKER 2
LINE OUT
560
Ω
SPEAKER 1
USE FIRST
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