Gallien-Krueger MB150E/112 Owner's Manual page 11

Low Noise Operation:
The MB-III Series uses a high gain, high head-
room, low noise input stage. It has such a large
dynamic range (60v p-p) that very few instruments
can overdrive it. Even most basses with "active"
electronics do not need to use the -14dB input pad.
The benefit to you is less hiss and much less noise
over all.
The Valve Effect:
As in all GK amplifiers, the MB-III Series preamp
incorporates what we call the Valve Effect, or
G.I.V.E(Gate Induced Valve Effect). We use field
effect devices with the gate biased in such a way
that emphasizes the optimum harmonic content of
the signal. Working in concert with our unique Four
Band Active Equalizer, and three stage Voicing Filter
Section, the Valve Effect produces a consistently
pleasing bass tone.
Cool and Reliable Class "H" Design:
The MB-III uses a "dual rail" power supply (class
H) that generates about half the heat of conven-
tional amplifiers. Low output signals run off of a
low voltage supply keeping the amp running cool.
When the signal exceeds a certain level, the amp
switches to its high voltage supply until the higher
signal level drops back down. By using a Class
'H' power supply it eliminates the need for a fan.
Convection cooling is used instead for completely
silent operation in the studio or on-stage. This
well thought out design helps make- the MB-III
the little amp with the big sound.
Intelligent Protection Circuitry:
The MB Series protection circuitry constantly
monitors for unsafe operating conditions such as
short circuits, miss-wired speaker cables, blown
speakers, improper ventilation, and incorrect speaker
configurations. In addition, protection is provided
during power up/down. If the amplifier 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 protection circuit
activates while playing, turn the amplifier off and
check the speaker output. If the problem persists,
contact GK directly for technical advice.
MicroBass-III Series
In Closing:
You should now have a thorough understanding of
how your new MicroBass Series amplifier works and
the advantages it offers in dialing in 'your' sound.
We thank you for reading the Owner's Manual and
wish you the best of times! Please send us your
comments via the web at www.gallien-krueger.com
or email us at sales@gallien.com.
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