Page 1
MB 108 Combo
OWNER’S MANUAL
Part#160-0810-A
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MB 108 COMBO
Congratulations!
Your purchase of a new Gallien-Krueger
amplifier is surely the result of much careful
consideration
at Gallien-Krueger are pleased that you chose
us, and are determined that you will be a
satisfied customer. In choosing a GK
amplifier, you now own an amplifier with
many unique features which will allow you to
create your own distinct sound.
To get the most out of your new purchase, please
take a few minutes to read through this
manual. If you are in a hurry, we suggest you
at least read through the Front Panel
Features/Quick Start section before setting
up your new amp. This will help get you
started and give you a few quick tips, but is
not a substitute for reading the rest of the
manual.
Your amplifier should have come with the
following items, please check the contents of
the box to ensure that you have everything.
Included with your MB Series Combo
Amplifier:
Power cord 1
Owner’s manual 1
Warranty card (US only) 1
If your amplifier did not come with all the items
listed, or if you encounter problems while
setting up your new equipment, please contact
your local dealer or GK as soon as possible.
Gallien-Krueger, Inc.
2234 Industrial Drive
Stockton, CA 95206
phone: (209) 234-7300
fax: (209) 234-8420
Internet: www.gallien-krueger.com
Email: info@gallien.com
on your part. For our part, we
GK Philosophy
I have never seen the point in doing
things the way others have done them. I also
have not been very interested in following the
latest fad. I’m a Stanford educated engineer
who worked my way through school as a
musician. Like all musicians, I have lugged
amplifiers up stairways and into car trunks,
always wondering why these things had to be
so heavy, bulky, and hard to handle.
As the principal innovator at GK, our
products reflect my attitudes and life
experiences. I don’t model my designs after
other manufacturers’ products. Instead, I
believe new and old problems are best solved
with new solutions. Having taken our own
path, GK products enjoy a unique, unmatched
sound, allowing you every opportunity to
make an original statement.
Having supported my products for over
thirty years, I have learned from the story they
tell. Gallien-Krueger is a reflection of that
story, and has a commitment to support that
legacy. Just as the products I created over
thirty five years ago are still telling their story,
the products we create today will be talking to
us tomorrow.
We’ll be listening,
Robert Gallien
Founder and President
We wish you a lifetime of good playing and
remember to
always have fun!
Page 3
MB 108 COMBO
Safety Information
Please read all enclosed safety precautions
before connecting or operating this product.
Verify Line Voltage and Amperage: Your new
amplifier has been factory configured for use with
the specific line voltage for your location:
100-120 Volt/60Hz 15 A circuit for USA/Canada.
220-240 Volt/(50/60Hz) 10 A circuit for
UK/Australia.
220-240 Volt/(50/60Hz) 10 A circuit for Europe.
100-120 Volt/50Hz 15 A circuit for Japan.
220-240 Volt/50Hz 10 A circuit for Korea.
Proper AC circuit for all other countries.
Connecting the amplifier to a line with
specifications other than indicated above can
create safety and fire hazard, and may damage the
amplifier. If you have any questions about the
voltage requirements for your specific model, or
about the line voltage in your area, contact your
dealer before plugging the unit into a wall outlet.
Verify AC Circuit Capacity Before Use: The
high power output of your amplifier may require
heavy current draw under full load conditions. To
insure proper performance and avoid potential
safety hazards, we recommend connection to line
circuits with amperage specified as above.
Connecting to the same circuit used by other
heavy power devices, such as high wattage lights,
may cause circuit breakers to trip. It is always a
good idea to avoid using any audio equipment on
the same AC circuit as equipment with motors,
such as air conditioners or refrigerators. This will
lessen the possibility of power variation and
electrical start up noise affecting your sound.
USA: Indoor use only.
Norway: Apparatet må tilkoples jordet stikkontakt
Sweden: Apparaten skall anslutas till jordat uttag
Finland: Laite on liitettävä suojakoskettimilla
varustettuun pistorasiaan
China: 在海拔高度 2000 米或更低和非热带位置仅用
AC Power Cord: To avoid safety hazards, use
only the power cord supplied with your unit. If a
replacement cord is needed, make certain to use a
standard IEC compliant cord. Damaged power
cords should be replaced immediately. When
setting up, make certain that the AC plug is easily
accessible. If you do not intend to use the
amplifier for a considerable length of time,
disconnect the plug from the AC mains socket. Do
not use an extension cord.
Earth Grounding Connection: To prevent
electric shock, do not remove the grounding plug
on the power cord, or use any plug or extension
cord that does not have a grounding plug
provided. Make certain that the AC outlet is
properly grounded as well. Do not use an adapter
plug with this product.
Do Not Open the Amplifier Enclosure: There
are no user serviceable parts inside this product.
Opening the amplifier enclosure may present a
shock hazard. Modification to the product will
void your warranty. If liquid enters the unit, or
any metal object such as a paper clip accidentally
falls inside the enclosure, disconnect the unit from
the AC power source immediately and consult an
authorized service station.
Setup: To insure proper operation and to avoid
potential safety hazards, place the unit on a firm,
level surface. Do not plug or unplug the
instrument cable while the amplifier power is on.
Heat & Ventilation: Make sure there is space
provided for proper ventilation. Avoid using in
extremely hot or cold locations and areas that are
exposed to direct sunlight or near heating
equipment. Avoid using in moist or high humidity
areas.
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MB 108 COMBO
INPUT
GAIN
1
2
MID
TREBLE
3 4 5 6 7 8
MB110 Control Panel Features
Input: A standard ¼" (6.3mm) input to
1
connect instruments using a shielded cable.
Gain: Sets the preamp gain after the input
2
stage. It is used in conjunction with the input
pad to optimize the amplifier’s headroom.
Treble: Boost and cut at 8 kHz shelving type.
3
Use this control to add or remove edge and
definition.
4
Mid: Boost and cut at 500Hz. A ‘Q optimized’
band pass type works on lower string
harmonics and effects the punch of your
sound.
5
Bass: Boost and cut at 50Hz, shelving type
used to control the low end push.
Aux In: This ⅛" (3mm) input for a CD or MP3
6
player allows the user to monitor an external
audio source.
Phones: A ⅛" (3mm) headphone jack is
7
provided. When phones are connected, the
signal sent to the speaker is interrupted.
PHONES
POWER
108
OFF
ON
AC INPUT
9
PAT CH B AYACTIVE EQUALIZERINPUT GAIN
BASS
AUX-IN
8
Power Switch: Turns the amplifier on and off.
In the on position, the ring surrounding the
button will light red during power up then
changes to blue, indicating the amp is ready
for normal operation. Should the amp
experience a fault (over heat or over current)
the amp will mute and the ring will light red
until the condition is corrected. This LED
turns off when the power is switched off. This
turns the amp off but it does not completely
disconnect the power from the AC mains.
Rear Panel Features
9
AC Receptacle: The detachable power cord
connects here.
Quick Start
The MB Series Combos are designed to be
simple to operate and all controls have a well
defined purpose. These directions will take
you through the basics and give you a good
start for setting up your sound.
Initial front panel control settings: Set all
EQ controls to 12:00 and the input gain should
be set to zero.
Volume settings: Set the Gain (volume) to 12
o'clock. While playing, turn the input gain up
to the desired volume level. At this point you
can experiment with different EQ settings.
Tech Talk
Equalization: Standard tone controls and
graphic equalizers give you plenty of
variation, but they don’t provide what the
instrument really needs. The fact is, graphic
equalizers are intended for room equalization.
The equalization in Gallien-Krueger
amplifiers reflects 40 years of continuous
development and refinement.
Smart Protection Circuitry: The MB Series
protection circuitry constantly monitors for
unsafe operating conditions such as short
circuits, miswired speaker cables, blown
speakers, improper ventilation, and incorrect
speaker configurations. In addition, protection
is provided during power up/down. If the MB
108 senses any unsafe operating conditions,
the output signal is immediately muted and the
power light changes from Blue to Red. The
amplifier will remain muted until the fault is
removed. If the problem persists, contact GK
directly for technical advice.
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MB 108 COMBO
US
R
SPECIFICATIONS & CERTIFICATIONS
Output Power:
25W @ 8 Ohms
Input/Output Specs:
Maximum Input Level
Input Impedance
0.6V Rms
1M Ohms
Equalizer:
Bass
Mid
Treble
+/-10dB @ 50Hz
+6dB/-10dB @ 500Hz
+/-14dB @ 8KHz
Noise: -90 dB reference to 40W, “A” Weighted
Amplifier Protection: Full short circuit, thermal
and RF protection. Stable into reactive and
mismatch loads. Five second muted warm-up.
Dimensions (HxWxD):
15.56” (395.34mm) x12.54” (318.64mm) x 11.55”
(293.24mm)
Weight:
17.5 lbs. (7.9 kgs)
Power requirements:
U.S.A./Canada 120V/50/60Hz.
40W (full power), 5.71W (average power)
Europe 230V/50Hz/60Hz
40W (full power), 5.71W (average power)
Japan 100V/50Hz/60Hz
40W (full power) 5.71W (average power)
This device has been tested and found to comply
with: CAN/CSA 60065-03+AM 1+2 Safety
Requirements. UL std. No. 60065-03 (2012) Safety
Requirements. IEC 60065-01 + AM 1+ Am2.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference,
and
(2) this device must accept any interference
received, including interference that may cause
undesired operation.
Note: This equipment has been tested and found to
comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules.
This device has been tested and found to comply
with:
EN 61000-6-1: 2007 Immunity.
EN 61000-6-3: 2011 Emission.
MB 108
Owner’s Manual
Part # 160-0810-A
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