YOUR RIVERA AMP IS AN IMPORTANT PART
OF YOUR SOUND
Your sound is your signature, your mark, your voice. An amp only deserves to have your guitar plugged into it
if it can deliver the tone you want—and, of course, the dependability you need. It’s as simple as that. And it’s
exactly why you bought your RIVERA amp. For that, we thank you, and we’re confident that you’ll enjoy
your amp for years to come.
Many factors go into creating a great amp—experience, an understanding of what guitarists want, and a lot of
hard work. You’ll notice that tone isn’t on any par ts list. Roadworthiness isn’t, either. And there’s no law saying
that an amp must sound good or be well-made. But we dedicate ourselves to making the best-sounding, most
reliable amplifiers anywhere. That’s why we use only the highest-quality components, regardless of price. Such
features as metal jacks, ultra-strong dadoed cabinet construction, and highest-quality electronic components
are part of our uncompromising approach. They’re chosen for their precision, strength, and ability to withstand the rigors of years of use—and occasional abuse—on the stage and in the studio. No compromises are
made because cutting any corners—no matter how small—means settling for second best.
This requires dedication to you, the guitarist, and a belief that an amp is more than a collection of parts. It’s
part of your sound.
Please fill in the following information for future reference:
Model Name: Hundred Duo Twelve
Model Number: R100-212A
Serial Number:
Dealer’s Name:
Dealer’s Address:
Date of Purchase:
3
2
1
Channel 1
D
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
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
12316 Branford St., Unit G
Sun Valley, CA 91352
Telephone (818) 890-2826
FAX (818) 890-5202
Channel 2
Hundred
uo Twelve
PACKING INFORMATION
Unpacking
Before you plug in, inspect your Hundred Duo Twelve amp for any damage. Your amp was inspected and
sound-tested before shipment, but transportation can sometimes be tough. Check that the FS-7 Footswitch
and power cord have been shipped with the amp. If parts are missing, or if any damage has occurred, contact
your dealer.
Packing Materials
We designed the original box and packing materials to protect your amp during shipment. Save them. If you
ever need to send your amp to us or to anyone else, the original box and packing materials will ensure safe
transit.
SAFETY PRECAUTIONS
Throughout this manual, the lightning flash with an arrowhead symbol within a triangle is intended
to alert you to the presence of uninsulated “dangerous voltages” within the product’s enclosure that
may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within a triangle is intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the literature that accompanies the product.
There are no user-serviceable parts inside of this amplifier.
Warning:
To avoid the risk of shock or fire, do not expose this amplifier to moisture. Do not remove the
chassis from its cabinet, or remove metal covers from chassis parts. Removing the chassis from its cabinet
exposes extremely dangerous high voltages. There are no user-serviceable parts inside. Hazardous voltages are
present inside the chassis. Refer all servicing to qualified personnel.
Caution:
To avoid a fire hazard, always replace the fuses with the same type and rating.
Caution:
Always replace the line cord (mains supply) with the proper type.
Caution:
Always turn off the amplifier before making or unplugging any speaker connections.
Always transport your amplifier securely, preferably in a suitable flight case or packing carton. Before operating your amplifier, be sure the speakers used are properly connected. For countries where 220 to 240 volts AC
is encountered, make sure that you have the correct power cord. Our 230-volt export unit can be used with
any of these voltages. For Japan 100VAC models, all instructions for the 115VAC models apply.
In the event that you have questions, comments, or suggestions, please contact us at:
RIVERA
12316 Branford St., Unit G
Sun Valley, CA 91352
Telephone (818) 890-2826
FAX (818) 890-5202
4
3
2
1
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
Channel 2
Hundred
uo Twelve
TABLE OF CONTENTS
Packing information 2
Safety precautions 2
Warranty 4
Quick Start instructions 5
Front panel 6
High Gain input 6
Low Gain input 6
Channel 1 overview and controls 6
Channel 2 overview and controls 7
Reverb 7
Presence 7
Standby 7
Power 7
Rear Panel 8
Mains Input 8
Mains Fuse 8
HT Fuse 8
Speaker outputs 9
Line Out 9
Footswitch jack 9
Effects Loop 10
Setting Effects Loop levels 10
Speakers 10
Connecting the Hundred Duo Twelve with other gear 11
Driving an extension speaker cabinet 11
Driving two speaker cabinets 12
Running two amps in parallel without a Y-cord 12
Slaving a second Hundred Duo Twelve 13
Slaving a second amp or power amp 13
Placing a signal processor in the effects loop 14
Sending a direct signal to P.A. or recording gear 14
Care and troubleshooting 15
Quick troubleshooting guide 16
Tube care and replacement 17
Tube location chart 17
Tube function explanation 17
Checking for microphonic tubes 17
Preamp tube first aid 18
Power amp tube first aid 18
Specifications 19
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
5
4
3
2
Channel 2
Hundred
uo Twelve
WARRANTY
Subject to the Obligations and Exclusions found below, this RIVERA product is warranted against manufacturing defects in material and workmanship for the period of one (1) year from the date of purchase, with the
exception of tubes, which carry no warranty, and loudspeaker drivers, which are covered for 90 days.
The warranty period commences on the date of purchase by the original user. Performance under this warranty must be obtained at one of the following: a RIVERA Authorized Service Station, by returning the unit to
the RIVERA factory with prior authorization, or (in countries outside of the United States) by a representative RIVERA distributor. A list of RIVERA Authorized Service Stations can be obtained from RIVERA,
12316 Branford St., Unit G, Sun Valley, CA 91352, USA, ATTN: Warranty Service. Telephone (818) 8902826; telefacsimile (818) 890-5202.
Obligations
1. This warranty will be honored only on the presentation of the original proof of purchase.
2. Transportation of the product to the service station or RIVERA factory is the responsibility of the user
unless specifically stated otherwise in this warranty. RIVERA will pay for return shipping charges if the
repairs are covered by the warranty.
Exclusions
1. This warranty shall not cover adjustment of customer-operated controls as explained in the appropriate
model’s instruction manual, or products that have been altered, replaced, or have missing serial numbers.
2. This warranty shall not apply to the appearance of accessory items including, but not limited to, cabinets,
cabinet parts, or knobs.
3. This warranty does not apply to uncrating, setup, installation, or the removal and reinstallation of products
for repair.
4. This warranty shall not apply to repairs or replacements necessitated by any cause beyond the control of
RIVERA including, but not limited to, any malfunction, defects, or failure caused by or resulting from
unauthorized service or parts, damaged or broken tubes, incorrect line voltage, improper maintenance,
modification or repair for the user, abuse, misuse, neglect, accident, fire, flood, or other Acts of God.
5. This warranty shall not apply to any loudspeaker drivers that have been damaged due to thermal destruction, or physical destruction such as moisture, rips, tears, shock, or transport.
6. Responsibility for any repair of any RIVERA product sold outside of U.S. boundaries is borne by the
RIVERA representative in that particular country or territory. Also, the warranty term and conditions may
be different from those stated above. Please contact the RIVERA distributor or dealer in your country for
more information.
The foregoing is in lieu of all other expressed warranties, and RIVERA does not authorize any party to assume
for it any other obligation or liability. In no event shall RIVERA be liable for special or consequential damages arising from the use of this product, or for any delay in the performance or this warranty due to causes
beyond our control. Some states do not allow limitations on how long an implied warranty lasts and/or do
not allow the exclusion or limitation of consequential damages, so the above limitations on implied warranty
and consequential damages may not apply to you. This warranty gives you specific legal rights. You may have
other rights that vary from state to state.
6
5
4
3
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
Channel 2
Hundred
uo Twelve
NO TIME TO READ THIS MANUAL?
AT LEAST READ THIS PAGE NOW!
Before you plug in:
Take a quick look inside the back of your amp. Make sure of the following—
1. The tubes are securely seated in their sockets (see page 15 for further information on checking for loose
tubes).
2. The internal speaker’s cord is plugged into the Speaker 1 output(this jack must always be used first).
3. The power cord is plugged in.
4. The FS-7 footswitch is plugged in (this is optional).
Now look at the front to make sure:
1. The Volume and Master controls are set at low levels (2 is a good starting point).
2. The Power switch is off (the lower half is pushed in).
3. The Standby switch is set to standby mode (the lower half is pushed in).
Plug in!
Now plug the amp into the wall, plug your guitar into either input jack, and set your controls to one of the
Quick Start settings outlined here. Then turn on the Power switch. Wait for about a minute for the tubes to
warm up. Turn on the Standby switch. Now it’s time to rock.
After you’ve played with your Hundred Duo Twelve for a while, check out the rest of the manual for some
good tips on getting the most out of your amp.
QUICK START SETTINGS
If you’re looking for a good starting point, try these settings. Remember that every guitar sounds different, so
try both inputs, and adjust the reverb and presence to suit your taste.
Ch.1: Clean Blues
Ch.2: Clean
Deluxe
Ch.1: Grunge
Rhythm
Ch.2: SRV Lead
Ch.1: Max Sustain
Ch.2: Fat Blues
Lead
7
6
5
4
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
383710
Use
Either
463410
PULL PULL
Set To
Taste
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10 10 3 7 3
PULL
High
Gain
7744 6
PULL PULL PULL
Set To
Taste
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10 8 8 5 6
PULL
High
Gain
10 7 7 3 3
PULL
Set To
Taste
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
Channel 2
Hundred
uo Twelve
HIGH
GAIN
HIGH
GAIN
INPUTS
INPUTS
LOW
GAIN
LOW
GAIN
VOLUME
BASS
Channel 1
MIDDLE
TREBLE
MASTER
PULL
SELECT
VOLUME
BASS
Channel 1
MIDDLE
TREBLE
PULL
BOOST
MASTER
PULL
SELECT
PULL
BOOST
VOLUME
VOLUME
Channel 2
TREBLE MIDDLE BASS
PULL
PULL
NOTCH
BRIGHT
Channel 2
TREBLE MIDDLE BASS
PULL
PULL
NOTCH
BRIGHT
MASTER
PULL
NINJA
MASTER
PULL
NINJA
REVERB PRESENCE
REVERB PRESENCE
HIGH
GAIN
INPUTS
LOW
GAIN
VOLUME
BASS
Channel 1
MIDDLE
TREBLE
PULL
SELECT
MASTER
PULL
BOOST
Channel 2
TREBLE MIDDLE BASS
VOLUME
MASTER
PULL
PULL
NOTCH
BRIGHT
PULL
NINJA
REVERB PRESENCE
FRONT PANEL
High Gain input
This is a high-sensitivity input. If your guitar has hot pickups,
then plugging into it makes it easy to overdrive the preamp section, creating harmonic distortion. Guitars equipped with low-output pickups seem hotter than usual when plugged
into this input.
Low Gain input
This is a low-sensitivity input. Guitars plugged into it have more headroom before distortion sets in (meaning that you can crank up a channel’s volume a little louder before you experience preamp distortion). This is a good choice for a clean overall sound, and is especially well-suited to active pickups
or guitars equipped with preamps.
Channel 1
Both channels are voiced differently, and
Channel 1 is definitely geared toward creating impressive overdrive (think of a “British” tone). Grit, grunge,
dirt—whatever you’re looking for in the distortion
department is here, from sweet and singing to hard-driving to maximum sustain. Note: Like the controls on
all classic amps, the Treble, Middle, and Bass interact,
creating smooth, musical tone changes. All three controls operate with even response throughout their ranges.
Volume (with channel-select switch)
Although it’s labeled “Volume,” this control does a lot more
than determine how loud Channel 1 is. It regulates the preamp’s volume and works with the Master to set the
level and distortion amount. A simple rule of thumb is, the higher the Volume is set, the more distortion you
get. The pull switch selects which channel is active. Its circuitry is designed so that you don’t hear a pop or click
when the channel is changed. (The FS-7 footswitch also selects channels; the Volume’s pull switch must be
pushed in for the FS-7 to choose channels. See page 9 for more on the FS-7 and its functions.)
Bass
The “chunk” and support that form the backbone of your tone come from this control. Its effect on
your overall sound will be different at high and low volumes due to the speaker’s characteristics and how
much distortion you use.
Middle
The midrange circuit provides the “meat” that fills out your sound. It has a slight notch in the frequency spectrum at about 550 Hz, and turning the knob alters the depth of that notch, letting you change
the overall voicing of your tone.
Treble
Whether you’re looking for edge, slash, or just a little shimmer, this knob’s for you. Like the Bass
control, the apparent effect of the Treble changes with the loudness and distortion you dial in.
Master (with Pull Boost switch)
Think of the Master as a sort of governor that sets the maximum
loudness for the channel. Also, think of it as the second half of what the Volume knob does. With the Volume
turned down and the Master up, there’s less distortion than if you crank up the Volume and set the Master lower.
The Master control comes after all distortion and tone-shaping on Channel 1, so its level doesn’t have a bearing
on your basic tone. When you pull out the Boost switch on Channel 1, it adds a whole range of harmonics, and
not just gain. This is easy to hear by playing a power chord and comparing its sound with the switch pushed in
and pulled out. With the switch activated, the tone blooms, going from fat to ferocious.
8
7
6
5
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
Channel 2
Hundred
uo Twelve
INPUTS
HIGH
GAIN
LOW
GAIN
VOLUME
BASS
Channel 1
MIDDLE TREBLE
MASTER
PULL
SELECT
PULL
BOOST
Channel 2
Channel 2 is extremely flexible, with a
flavor that brings to mind the great classic American
tones and textures. You can get some pretty impressive
lead overdrive distortion out of Channel 2, and as a rhythm channel it brings out every subtlety of your playing.
The range of tones can be anywhere from sparklingclean to perfect for bluesy rhythm—the kind of sound that has an attitude and gets meaner as you pick harder .
Volume
The Volume knob regulates the preamp’s volume and works with the Master to set the level and dis-
tortion amount. A simple rule of thumb is, the higher the Volume is set, the more distortion you get.
Treble (with Pull Bright switch)
This treble control is similar in operation to the one on Channel 1.
In addition, it has a built-in Pull Bright switch. When pulled out, it adds bright highlights to the tone.
Middle (with Pull Notch switch)
The midrange circuit has a slight notch in the frequency spectrum at about 550 Hz, and turning the knob alters the depth of that notch. Its Pull Notch switch shifts the
frequency center of that notch down to about 250 Hz. (For reference, most 1950s tweed amps have their
notch centered at 550 Hz, while classic “blackface” amps have theirs centered at 250 Hz.) Experiment with
this, especially if you ’re looking for a uniquely expressive rhythm texture.
Bass
The “chunk” and support that form the backbone of your tone come from this control.
Master (with Pull Ninja switch)
Channel 2 has a special EQ circuit that works in conjunction with
the distortion circuit to sweeten the tone. Therefore, the Master knob’s effect goes beyond loudness control. Try
it with different Volume and Middle settings to adjust the amount of “singing” and “grit.” The Ninja Boost™,
activated by pulling out the Master knob, is a sweet-sounding boost characterized by a more subtle effect on
the harmonics than Channel 1’s Boost control while adding sustain. The Ninja Boost helps to drive the power
amp, and the best description of its influence over the tone is that it thickens it.
Reverb
In the tradition of classic amps, your Hundred Duo Twelve is equipped
with a spring reverb. Its single-knob operation controls its effect on the signal coming from both preamp channels. Specially buffered circuitry drives the reverb, keeping your tone intact and minimizing harshness.
Presence
The Presence control is incorporated as a vital part of the power amp sec-
tion. Think of it as a final brightness control after all the EQ, distortion, effects, and reverb.
Standby
By turning the Power on and the Standby off (the down position, labeled with a
“0”), you can warm up the amplifier before applying full voltage to the preamp and power
output tubes. This prolongs tube life. Using the Standby switch when you’re taking a break
also helps to extend the tubes’ life, plus it keeps the amp constantly at the ready. Just flip the
Standby switch to the up (“I”) position, and you’re r eady to play.
Power
This is your main power switch. The on position is indicated by the light being illuminated. The off
position is marked by the “0” on the switch. Before turning the amp on, always check that a speaker is connected and that the power cord is firmly plugged into the amp and the outlet.
9
8
7
6
Channel 1
D
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
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
Channel 2
Hundred
uo Twelve
VOLUME TREBLE MIDDLE BASS
Channel 2
MASTER
PULL
BRIGHT
PULL
NOTCH
PULL
NINJA
REVERB PRESENCE
STANDBY
POWER
REAR PANEL
Mains Input
Your Hundred Duo Twelve has a detachable power cord that connects to the chassis AC connector labeled Mains
Input. Always use this cord and, in the event that the po wer cor d r equires r eplacement, replace it with the same type
of power cord. Consult your RIVERA dealer for further information. Be sure to use a grounded electrical mains
power supply socket whenever possible. These outlets have a grounding pin in addition to the normal line and neu-
tral pin. The power cord supplied with your Hundred Duo Twelve has a 3-pin plug. Do not cut off or damage the
ground pin. If the available electrical outlet is of the older 2-pin type, use a suitable ground-lift adapter.
The U.S.A., Canada, and Japan share a common CSA/UL-style cord. Most of Europe and Scandinavia utilize
a Euro plug and have a SEMKO/VDE-style cord. Australia uses a different type of plug, as does England.
Note: Avoid using long extension cords. Long cords have sufficient resistance to electrical current that the
voltage arriving at your amp can be significantly reduced. This can have a bad effect on your tone.
Mains Fuse
This AC line fuse protects your amplifier from damage due to shorts, momentary surges, and defective power
tubes. In the event of a fuse failure, always replace it with the same type of fuse.
Note: Always turn the amp off and wait about five minutes before replacing a fuse. This allows
the parts to cool and high voltages to dissipate.
For 100VAC versions, the Mains Fuse is: 5 Amp, 250 Volt Slo-Blo type (size 3AG, or MDL)
For 115VAC versions, the Mains Fuse is: 4 Amp, 250 Volt Slo-Blo type (size 3AG, or MDL)
For 230VAC versions, the Mains Fuse is: T 2A (time-delay, 5mm x 20mm size)
HT Fuse
The power amplifier circuit has its own fuse for protecting the output section from short circuits and transient current peaks that exceed the normal current draw. These conditions are usually caused by a bad tube.
When a short circuit or transient peak causes the fuse to blow, the output tubes should be checked and
replaced, if necessary.
For 100VAC and 115VAC versions, the HT Fuse is: 1Amp, 250 Volt Slo-Blo type (3AG, or MDL)
For 230VAC versions, the HT Fuse is: T 1A (time-delay, 5mm x 20mm size)
Repeated blowing of this fuse is a clear indicator of a defective output tube.
Always use the correct fuse value when replacing the HT Fuse.
If the Mains Fuse or the HT Fuse repeatedly blows, refer your amp to your local RIVERA dealer or contact us
at (818) 890-2826 for further service assistance.
1
9
8
7
Channel 1
D
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
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
FUSE
FUSE
Channel 2
Hundred
uo Twelve
REPLACE FUSE WITH SAME TYPE AND RATING.
UTILISER UN FUSIBLE DE RECHANGE
DE MEME TYPE.
MAINS
60HzINPUT POWER
4A 250V
SLO-BLO
FUSE
H.T.
FUSE
1A 250V
SLO-BLO
CAUTION
TO REDUCE THE RISK OF
SERIAL NUMBER
MODEL
HUNDRED DUO TWELVE
RIVERA RESEARCH & DEVELOPMENT SUN VALLEY, CALIFORNIA, USA
WARNING: TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT EXPOSE
THIS EQUIPMENT TO RAIN OR MOISTURE.
ELECTRIC SHOCK,
DO NOT REMOVE CHASSIS.
440 WATTS
MAINS INPUT
115V
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 poweramp 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 1
D
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
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
Channel 2
Hundred
uo Twelve
SPEAKER 1
USE FIRST
SPEAKER JACKS
IN PARALLEL
100 WATTS RMS
CAUTION: CHASSIS SURFACE HOT.
ATTENTION: SUPERFICIE DE CHASSI CHAUDE.
AVIS: RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR.
TOTAL MINIMUM Z 4 Ω
SPEAKER 2 LINE OUT
560 Ω
FOOTSWITCH
USE FS-7 ONLY
CAUTION: NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
RETURN
LEVEL
EFFECTS LOOP
RETURN
Z IN
250K Ω
SEND
Z OUT
560 Ω
SEND
LEVEL
Effects Loop
Of course, you can use pedals and rack-mounted effects between your guitar and the amp. In fact, that’s
where most wah-wahs and other pedals sound exceptionally good.
However, rack signal processors are often best suited to being
placed after the preamp’s tone-shaping circuitry. Your Hundred
Duo Twelve’s Effects Loop is designed to give you the best match
between the amp and the processor by allowing you to set the level
of the signal going to the effect, as well as the one coming back.
Therefore, you can tailor your amp/effects levels for best signal-tonoise ratio and the amount of distortion you want. Note: The Effects Loop send can be used to route a signal
to a guitar tuner.
The Effects Loop comes after the preamp and reverb sections. In addition, its low-impedance circuitry lets
you drive everything from the simplest stomp-box effect to the most sophisticated pro signal processor with
excellent results. It’s also fully buffered, meaning that it can drive long cords and line-level gear and mixing
consoles. (Because the signal is electrically unbalanced, you can use an unbalanced-to-balanced output transformer to connect to equipment requiring a balanced input.)
Before you connect a signal processor to your amp, either turn the amp off or to standby.
Use high-quality shielded cords between the amp and processor. Never use a speaker cord.
Setting Effects Loop levels
1. After you connect the amp’s Send and Return with the signal processor’s input and output, set the amp’s
Send Level and Return Level between 1 and 2.
2. Plug in your guitar, turn the signal processor on, and then turn on the amp (or flip the standby switch).
3. Set the amp’s Effects Loop Send Level and the signal processor’s input level so that you don’t overload the
processor. Keep your ears open for unwanted distortion from the signal processor (you’ll know it by its
crackly, unmusical sound). Whack a few chords on your guitar to check that your settings are correct.
4. Now turn up the Effects Loop Return knob until the proper volume and overdrive are dialed in. You’ll
probably have to experiment with the signal processor’s output level until you get the best sound and lowest amount of noise.
5. Make sure that you set your straight/effects blend at the signal processor, since all of your preamp’s signal is
passed through the Effects Loop. Do not use an effects-only output to return from the processor to the
amp. Always use the “mix” output, if the unit has one.
The Effects Loop Send is configured so that it is always active, so you can use it as a variable output. Note
that if you use the Send to drive slave amps, etc., and have nothing plugged into the Return jack, the signal
still passes from the preamp to the power amp.
Speakers
The speakers in your Hundred Duo Twelve are specially designed Celestion 12" G12T-85 models with a 85watt power-handling capacity. They were selected for their classic tone and ability to deliver lots of volume.
To protect them, keep the grille on your amp at all times, and don’t use the back of the amp for storing any
sharp objects.
10
9
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
Channel 2
Hundred
uo Twelve
RETURN
LEVEL
E. REFER SERVICING TO QUALIFIED PERSONNEL.
EFFECTS LOOP
RETURN
Z IN
250K Ω
SEND
Z OUT
560 Ω
SEND
LEVEL
CONNECTING THE
HUNDRED DUO TWELVE
WITH OTHER GEAR
The following illustrations will help you to properly connect your Hundred Duo Twelve to other amps, extension speaker cabinets, and recording and P.A. gear. Make sure the amp and all other gear are turned off
whenever you make or change any connections.
Using a heavy-gauge speaker cord, connect the output jack labeled Speaker 2 to the speaker input on an
extension cabinet with a 4- or 8-ohm impedance and power-handling capacity of at least 100 watts. A
16-ohm extension cabinet can also be used, but it will reduce the amp’s output. Don’t use a 2-ohm
extension speaker. Note: Make sure that the Speaker 1 output is connected to the Hundred Duo
Twelve’s internal speaker.
1
12
11
Channel 1
D
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
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
Driving an extension speaker cabinet
To internal
Speaker
Channel 2
Hundred
uo Twelve
7
7
7
7
7
6
6
6
8
8
8
8
5
5
5
9
9
9
9
4
4
4
1
1
1
1
0
0
0
0
3
3
3
2
2
2
1
1
1
SPEAKER 2
7
6
6
8
8
5
5
9
9
4
4
undred
1
1
H
0
0
3
3
2
2
1
1
Duo Twelve
SPEAKER
8Ω"
7
7
7
6
6
6
8
8
8
5
5
5
9
9
4
4
4
1
1
0
0
3
3
3
2
2
2
1
1
1
SPEAKER 1
USE FIRST
7
6
6
8
5
5
9
9
4
4
1
1
0
0
3
3
2
2
1
1
TOTAL MIN. Z 4 Ω"
1
13
12
11
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
Driving two speaker cabinets
This setup is for employing the Hundred Duo Twelve as a head; its speaker is nonfunctional in this configuration. Unplug the internal speaker from the Speaker 1 output jack. Using heavy-gauge speaker cords, connect
the output jacks labeled Speaker 1 and Speaker 2 to the speaker inputs on extension cabinets with an 8-ohm
impedance and power-handling capacity of 100 watts. You can also hook up two 16-ohm cabinets or two 4ohm cabinets, but never use two 2-ohm cabinets, because the overall impedance load will be too low for the
amplifier and could result in damage.
Running two amps in parallel without a Y-cord
From
Guitar
The preamp and output amp sections, as well as all controls, function normally in this setup. Use a shielded
cord.
7
7
7
7
7
7
7
7
7
6
6
6
6
8
8
8
8
5
5
5
5
9
9
9
9
4
4
4
4
4
1
1
1
1
0
0
0
0
3
3
3
3
3
2
2
2
2
2
1
1
1
1
7
6
6
6
6
6
6
8
8
8
8
8
5
1
8
5
5
5
5
5
9
9
9
9
9
9
4
4
4
4
4
1
1
1
1
1
1
Hundred
0
0
0
0
0
0
3
3
3
3
3
2
2
2
2
2
1
1
1
1
1
Duo Twelve
Channel 2
Hundred
uo Twelve
SPEAKER 1
USE FIRST
SPEAKER 2
SPEAKER
8Ω"
SPEAKER
8Ω"
TOTAL MIN. Z 4 Ω"
7
7
7
7
7
7
7
7
7
6
6
6
6
8
8
8
8
5
5
5
5
9
9
9
9
4
4
4
4
4
1
1
1
1
0
0
0
0
3
3
3
3
3
2
2
2
2
2
1
1
1
1
7
6
6
6
6
6
6
8
8
8
8
8
5
1
8
5
5
5
5
5
9
9
9
9
9
9
4
4
4
4
4
1
1
1
1
1
1
0
Hundred
0
0
0
0
0
3
3
3
3
3
2
2
2
2
2
1
1
1
1
1
Duo Twelve
7
7
7
7
7
7
7
7
7
6
6
6
6
8
8
8
8
5
5
5
5
5
9
9
9
9
4
4
4
4
4
1
1
1
1
0
0
0
0
3
3
3
3
3
2
2
2
2
1
1
1
1
7
6
6
6
6
6
6
8
8
8
8
8
8
5
5
5
5
5
9
9
9
9
9
9
4
4
4
4
4
1
1
1
1
1
1
0
2
1
Hundred
0
0
0
0
0
3
3
3
3
3
2
2
2
2
2
1
1
1
1
1
Duo Twelve
INPUTS
HIGH
GAIN
LOW
GAIN
INPUTS
HIGH
GAIN
LOW
GAIN
1
14
13
12
Channel 1
D
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
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
Slaving a second Hundred Duo Twelve
Slaving a second amp or power amp
Using a shielded cor d, connect the first H undr ed Duo Twelve’s Line Out to the Effects Loop Return jack on a second
Hundr ed Duo Twelve. Adjusting the Return Level sets the relative volume of the second amp . All tone and distortion
adjustments are made by the first amp. Alternatively, you can use the Effects Loop Send jack from the first H undred
Duo Twelve instead of its Line Out. The Send Level control sets the signal level being sent to the second amp.
Connect a shielded cord from your Hundred Duo Twelve’s Line Out to the Power Amp In or Effects Loop Return of
a second amp. All volume and tone changes made on the Hundred Duo Twelve will affect what comes out of the second amp. Caution: Never use the speaker outputs as line outputs. Their power level is extremely high and can cause
tremendous damage to another amp’s input. If you don’t have any effects patched into the Hundred Duo Twelve’s Effects Loop, you can use its Send jack instead of the Line Out. The Send Lev el knob then acts as a variable output level.
To Internal
Speaker
To Internal
Speaker
Channel 2
7
7
7
7
7
7
7
7
7
6
6
6
6
8
8
8
8
5
5
5
5
5
9
9
9
9
4
4
4
4
4
1
1
1
1
0
0
0
0
3
3
3
3
3
2
2
2
2
1
1
1
1
7
6
6
6
6
6
6
8
8
8
8
8
8
5
5
5
5
5
9
9
9
9
9
9
4
4
4
4
4
1
0
3
2
2
1
1
undred
1
1
1
1
1
H
0
0
0
0
0
3
3
3
3
2
2
2
2
1
1
1
1
Duo Twelve
Hundred
uo Twelve
7
7
7
7
7
7
7
7
7
6
6
6
6
8
8
8
8
5
5
5
5
9
9
9
4
4
4
4
1
1
1
0
0
0
3
3
3
3
2
2
2
2
1
1
1
1
7
6
6
6
6
6
6
8
8
8
8
8
5
9
4
1
0
3
2
1
8
5
5
5
5
5
9
9
9
9
9
9
4
4
4
4
4
1
1
1
1
1
1
Hundred
0
0
0
0
0
0
3
3
3
3
3
2
2
2
2
2
1
1
1
1
1
Duo Twelve
EFFECTS LOOP
RETURN
Z IN
250 K Ω"
SEND
Z OUT
560 Ω"
SEND
LEVEL
2
3
4
5
1
10
9
8
7
6
SPEAKER 1
USE FIRST
TOTAL MIN. Z 4 Ω"
SPEAKER 2 LINE OUT
560 Ω"
RETURN
LEVEL
1
2
3
4
5
6
10
9
8
7
7
7
7
7
7
7
7
7
7
7
6
6
6
6
6
6
8
8
8
8
8
5
5
5
5
5
5
9
9
9
9
9
4
4
4
4
4
4
1
1
1
1
1
0
0
0
0
0
3
3
3
3
3
3
2
2
2
2
2
2
1
1
1
1
1
1
7
7
7
7
7
6
6
6
6
6
6
6
6
6
8
8
8
8
8
9
1
0
8
8
8
8
8
5
5
5
5
5
5
5
5
5
9
9
4
4
4
1
1
0
0
3
3
3
2
2
2
1
1
9
9
9
9
9
9
9
4
4
4
4
4
4
1
1
1
1
1
1
1
0
0
0
0
0
0
0
3
3
3
3
3
3
2
2
2
2
2
2
1
1
1
1
1
1
1
7
7
7
6
6
6
8
8
5
5
5
9
9
4
4
4
1
1
0
0
3
3
3
2
2
2
1
1
1
SPEAKER 1
USE FIRST
SPEAKER 2 LINE OUT
TOTAL MIN. Z 4 Ω"
7
7
7
7
7
7
6
8
8
5
5
9
9
4
4
1
1
0
0
3
3
2
2
1
7
6
6
6
6
6
6
8
8
8
8
8
8
5
5
5
5
5
9
9
9
9
9
9
4
4
4
4
4
1
1
1
1
1
1
0
1
Hundred
0
0
0
0
0
3
3
3
3
3
2
2
2
2
2
1
1
1
1
1
Duo Twelve
560 Ω"
POWER AMP
IN
Using shielded cor ds, connect the E ffects Loop S end to the pr ocessor ’s input, and the processor’s output to the Effects
Loop Return. Adjust the mixture of effect/non-effect sounds at the signal processor, and set the levels at the amp and
processor for lowest distortion. If you use multiple signal processors, connect them in series (processor 1’s output to
processor 2’s input, etc.), and patch the Hundred Duo Twelve’s Send to the first processor’s input and the Hundred
Duo Twelve’s Return to the last processor’s output. If the processor has stereo outputs, you can connect one to the
Effects Loop Return of a second amp .
Using a shielded cord, connect the Hundred Duo Twelve’s Line Out to the line input or channel input of a mixer or
recorder. (The signal comes from the amp’s output stage, so all tone, distortion, and overdrive characteristics are included.) You can use the Effects Loop Send jack instead of the Line Out, too. Caution: Never use the speaker output.
1
15
14
13
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
Placing a signal processor in the effects loop
Sending a direct signal to P.A. or recording gear
Signal
Processor
To Internal
Speaker
Channel 2
7
7
7
7
7
7
7
7
7
6
6
6
6
8
8
8
8
5
5
5
5
5
9
9
9
9
4
4
4
4
4
1
1
1
1
0
0
0
0
3
3
3
3
3
2
2
2
2
2
1
1
1
1
7
6
6
6
6
6
6
8
8
8
8
8
8
5
5
5
5
5
9
9
9
9
9
9
4
4
4
4
4
1
1
1
1
1
1
Hundred
0
0
0
0
0
0
3
3
3
3
3
2
2
2
2
2
1
1
1
1
1
1
Duo Twelve
Hundred
uo Twelve
RETURN
LEVEL
1
2
3
4
5
6
10
9
8
7
EFFECTS LOOP
RETURN
Z IN
250 K Ω"
SEND
Z OUT
560 Ω"
SEND
LEVEL
2
3
4
5
OUTPUT
1
10
INPUT
9
8
7
6
7
7
7
7
7
7
7
7
7
6
6
6
6
8
8
8
8
5
5
5
5
5
9
9
9
9
4
4
4
4
4
1
1
1
1
0
0
0
0
3
3
3
3
3
2
2
2
2
1
1
1
1
7
6
6
6
6
6
6
8
8
8
8
8
8
5
5
5
5
5
9
9
9
9
9
9
4
4
4
4
4
1
1
1
1
1
1
0
2
1
Hundred
0
0
0
0
0
3
3
3
3
3
2
2
2
2
2
1
1
1
1
1
Duo Twelve
SPEAKER 1
USE FIRST
SPEAKER 2 LINE OUT
TOTAL MIN. Z 4 Ω"
560 Ω"
LINE INPUT
CARE &TROUBLESHOOTING
Chances are, you bought your RIVERA amp to make your guitar sound great, not to improve your skills with
electronics. What we’re saying is, “If something ever goes wrong with your amp, don’t try to fix it yourself.”
There are some potentially lethal high voltages inside the amp, plus if you do something that causes even
more damage than when you started out, the person who does the real repair will probably tell you, “Hey, I
know what’s wrong. Somebody’s been monkeying around in here.” And, of course, your warranty will be void.
There are some things you can do to keep your amp running and to determine (and hopefully remedy) common difficulties.
Keep the amp out of the elements.
A lot of this is common sense. Don’t use your amp in a sauna
or in the bathtub. Don’t leave it out in the rain or in a damp basement. If you take it to a gig or to practice
and it’s cold out, give it 15 minutes or a half-hour to stand in the room where you’ll be playing. That way, it
can get acclimated and sound its best when you ’re ready to play.
Be nice to it.
The jury is still out on whether talking to plants makes them happy, or whether Elvis lives
on the moon, but the verdict on pampering amps is well-known. Don’t drop, knock over, kick, or otherwise
mistreat your amp. If you don’t have a flight case for travel, use the box it came in, or wrap it in something
thick, soft, and protective. RIVERA amps are built to take a lot, but why push it? If you treat your amp well,
it will treat you (and your guitar’s tone) well.
Check for loose tubes.
Here’s as close as you should get to being inside your amp. With the amp
unplugged and cooled off, examine the tubes to make sure they’re in tight and straight. Note: Unlike light
bulbs, tubes push straight into their sockets. Never try to twist them! Also note that some of the tubes are
inside of metal sleeves. These are easy to remove for checking the tubes. Grasp the sleeve with your fingers
and depress it (it’s spring-loaded) and turn to the left (counterclockwise). Now pull it off; this may require a
little wiggling action. Remember to put the sleeve back on after you check the tube.
Make sure the power cord is tightly plugged in.
This is critical at both ends of the cord. And
don’t use one of those 3-pin-to-2-pin adapters unless you connect the ground lug to the outlet. Leaving the ground
disconnected isn ’t just cheating—it’s dangerous to unground any electrical device that’s supposed to be grounded.
Let it idle before you play.
If you have a few minutes to spare before you play, turn the amp on and
set it to standby so that all the parts can get warmed up and stable. Once the amp’s nice and warm (5 or 10
minutes), flip the Standby switch and get busy on your guitar.
Don’t use the back of the cabinet as a storage locker.
Remember, there’s a speaker and glass
tubes in there. Both cost money to replace (money that’s better spent on strings, picks, etc., right?). Stash your
footswitch and any other heavy and/or hard-edged stuff in a bag or a case for travel.
Clean your amp once in a while.
You can use a damp cloth or one dipped in a weak solution of
dishwashing detergent and water (lots of water!) to wipe off grime, dried Pepsi, and whatever else accumulates
on the vinyl covering. Make sure the amp is unplugged first. Ever ything else can be vacuumed, as long as
you’re gentle and use a soft-bristled brush attachment on the vacuum hose.
Channel 1
D
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
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
16
15
14
Channel 2
Hundred
uo Twelve
QUICK TROUBLESHOOTING GUIDE
Amp won’t turn on
1. Make sure that the AC mains cord is securely connected at both ends.
2. Verify the power source with something that you know works (a radio, a light, etc.).
3. Check the Mains Fuse, and replace it if necessary (if it blows again, refer your amp to qualified service personnel).
There’s no sound
1. Make sure that the guitar cord to the input is okay (wiggle it—check your guitar’s volume setting, too).
2. Check the Volume controls.
3. Check the Standby switch.
4. If an effect or signal processor is plugged into the Effects Loop, make sure it’s turned on and that the level
controls on the amp and processor are set correctly.
5. Check the speaker cable or cables to see if they are disconnected or shorted.
6. Check for blown speakers.
7. If a fuse is blown, replace it (if it blows again, refer your amp to qualified service personnel).
The amp shuts down unexpectedly
1. Follow the seven steps in the “There’s no sound” section.
2. Turn off the amp and wait 25 minutes before turning it on again. An internal thermal protection circuit
can shut the amp down if it becomes overheated.
3. After 25 minutes, turn it on, and if it shuts down again, refer the amp to qualified service personnel.
Note: On SEMKO 230-volt models, there are two additional T 1.6A (250-volt Slo-Blo type, 5mm x 20mm)
fuses and one T 10A (250-volt Slo-Blo type, 5mm x 20mm) fuse located internally. These protect the amp’s
output tube filaments and should only be replaced by qualified service personnel.
There’s unwanted distortion
1. Check the speaker.
2. Check the cables.
3. Check the signal level at other devices in the signal path.
4. One or more tubes may be bad (refer to the tube information on page 17, or take your amp to qualified
service personnel).
1
17
16
15
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
Channel 2
Hundred
uo Twelve
TUBE CARE & REPLACEMENT
Like a sports car, there’s a certain amount of wear and tear to be expected in a high-performance tube amp.
Over time, especially with hard use, tubes may need replacement. That’s why it’s a good idea to make note of
when you purchased your amp and whenever you replace tubes. It’s no accident that your amp has two common types of tubes: They’re great-sounding and reliable, and it’s easy to find replacements. Here’s a tube chart
to show you which tubes go where.
Location Type
V1 12AX7
V2 12AX7
V3 12AX7
V4 12AX7
V5 12AX7
V6 EL-34
V7 EL-34
V8 EL-34
V9 EL-34
Here’s a brief description of what each tube does:
V1 Input buffer and tone control driver for Channel 2, and also the first preamp stage of Channel 1
V2 Tone control follower for Channel 2 and an additional gain stage for Channel 1
V3 Final stages for both channels before the mix er stage
V4 Reverb follower and the mixer stage, provides gain to the reverb pan
V5 Phase inverter driver tube for the power amp section
V6-V9 Power amp tubes—for best operation, they should always be changed in a group of four
Checking for microphonic tubes
As tubes wear , some problems can come up . One of the most common symptoms is a ringing sound. This is usually
due to the tube becoming microphonic (like its name suggests, it’s picking up sound and amplifying it).
With the amp unplugged and cooled off, examine the tubes to make sure they’re in tight and straight. Never
twist them! Gently grasp the tube and wiggle it into place. Because some of the tubes are inside of metal
sleeves, you will have to remove the sleeves to check them for microphonics. Grasp the sleeve with your fingers and depress it (it’s spring-loaded) and turn to the left (counterclockwise). Now pull it off; this may
require a little wiggling action.
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
18
17
16
V6
V7
V1
V2 V3
V4
V5
V8 V9
Channel 2
Hundred
uo Twelve
Preamp tube first aid
If you hear ringing (a feedback-like high-pitched sound) in your amp, it’s probably coming from a preamp
tube. Here’s a procedure to find which tube is giving you trouble.
With nothing plugged into either the High Gain or Low Gain inputs,
and the Master controls turned down to 5 or below, turn the amp on.
Turn up the Volume on Channel 1 and Channel 2, as well as the Reverb
knob. Now use the tip of a pencil to gently tap the end of each of the
small tubes (V1 through V5) and listen for sustained ringing. Turn up the
Volume and Master knobs and keep tapping until you find the tube that
rings (or squeals).
Turn off the amp, and allow the tubes to cool. Now pull out the troublesome tube and replace it with one of the same value (that is, if you’re
pulling out a 12AX7, replace it with a 12AX7).
Make sure that the tube is oriented correctly when pulling it out or
putting it back in. If you look at the end of the tube and the socket, you’ll
notice that the nine pins are arranged in an incomplete circle. Always make
sure the pins are aligned correctly. Never force a tube into its socket.
Remember to put the sleeve back on after you check or replace a
tube.
Power amp tube first aid
Like preamp tubes, power amp tubes can go bad or wear out. Your Hundred
Duo Twelve has four power amp tubes, and if one goes bad, they should all
be replaced. This assures optimum output and tone.
If a power tube shorts out, the HT Fuse will be blown. Remove power from
the amp and replace the fuse before doing the following:
1. Remove the power tubes. Remember the way the eight pins are arranged,
and note that the center hole on the socket has a keyway that matches the center post on the tube.
2. Replace one tube. Turn the amp on. If the fuse blows (or the tube glows cherry red, indicating an internal
short), you’ve found the bad tube. Turn off the amp immediately. If the fuse doesn’t blow, replace another
tube and turn the amp on again. Repeat this procedure until you’ve determined which tube is bad.
3. When the tubes have cooled, remove them. Replace all four tubes. (Don’t throw away the good tubes from
the old set, though—save them as spares!)
Channel 1
D
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
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
2
19
18
17
Testing a preamp tube: Tap gently and listen for ringing.
Grip the tube firmly and then
wiggle it out of its socket.
Channel 2
Hundred
uo Twelve
MODEL R100-212A SPECIFICATIONS
High-gain input impedance: 1 Megohm
Low-gain input impedance: 33k ohms
Output impedance: 8 ohms
Line output impedance: 330 ohms minimum
Total harmonic distortion: 5% at rated power
Bandwidth: 50 Hz to 20kHz
Preamp tubes: Five 12AX7A
Output tubes: Four EL-34
Tube voltage: 430 volts DC
Output power: 100 watts RMS into 4 ohms
Operating voltage: 115 volts AC or 230 volts AC (export model), or 100 volts AC (Japan only)
Speakers: Two 12" Celestion G12T-85
Speaker impedance: 8 ohms
Speaker power handling: 85 watts
Reverb type: Accutronics 3-spring
Footswitch functions: Channel switching, boost for Channel 1, Ninja Boost
Height: 18"
Width: 26
1
/2
"
Depth: 9
3
/4"
Weight: 80 lbs.
Cabinet material: Solid lumber-core plywood
Cabinet thickness: 3/4"
Baffleboard: 3/4"-thick medium-density fiberboard
Construction: Dadoed joints
Covering: 30-oz. vinyl
Cleaning of vinyl covering: Moist cloth, dishwashing liquid
Grillecloth: Fiberglass, fire-retardant cloth
Care of grillecloth: Remove frame, use compressed air to blow out dust
Because we strive to build the highest-quality product, we reserve the right to change specifications of our
products without prior notice.
D
INPUTS
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
1
0
9
8
7
6
5
4
3
2
1
20
19
18
PN: 310-010
VOLUME
BASS
Channel 1
MIDDLE TREBLE
MASTER
VOLUME TREBLE MIDDLE BASS
Channel 2
MASTER
REVERB PRESENCE
Hundred
HIGH
GAIN
LOW
GAIN
PULL
SELECT
PULL
BOOST
PULL
BRIGHT
PULL
NOTCH
PULL
NINJA
uo Twelve
HANDCRAFTED BY RIVERA RESEARCH & DEVELOPMENT
SUN VALLEY, CA USA
STANDBY
POWER
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