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Marshall JCM 900 - 4100 Manual

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The JCM900 4100 was first made
in 1990 in response to the perennial
problem of ‘not enough gain’. At the
time, guitarists were hot-rodding their
Marshall amps to achieve higher levels
of gain, which was expensive and far
from reliable. And so Marshall set to
work on a remedy.
Designing an amplifier with masses of
gain is relatively straight forward. The
art is to make a high gain amplifier that
is not excessively noisy, is reliable and
retains great tone. After a period of
extended R&D, Marshall provided the
world with the answer: the JCM900
Series.
“Shredders of the world, please note:
The JCM900 saves you the trouble of
having your amp hot-rodded.”
- Guitar Player Magazine, 1991.
The British made, all-valve 4100
is not only designed to be high
gain, it is designed to be versatile,
with two independently controlled
footswitchable channels, each with its
own distinct voicing, Master Volume and
footswitchable Reverb.
Channel A is voiced for brilliant clean
tones when the Gain control is set lower.
Turn up the Gain for crunch and more
driven tones. Channel B is boosted
with enough Gain for fearsome lead
tones, ranging from classic lead on
lower settings to screaming shred on
maximum.
The 100 Watt 4100 uses four high
quality 5881 output valves for their
unique harmonic distortion properties,
as well as two ECC83 valves in the
preamp. With most valve amplifiers,
particularly Marshalls, the best sounds
are achieved when, along with the
preamp Gain cranked, the Master
Volume is set high enough to overdrive
the output valves.
It is the delicate working balance
between the preamp and the power
stage of the amplifier, and the interaction
between the EQ controls, that will
determine the sonic character produced
by the 4100 – experiment to find your
sound.
Thank you for choosing Marshall and
we sincerely hope that your JCM900
4100 Hi Gain Dual Reverb amplifier will
provide you with countless hours of ‘hot-
rodded’ tone.
INTRODUCTION
OVERVIEW
FOLLOW ALL INSTRUCTIONS AND HEED ALL WARNINGS
KEEP THESE INSTRUCTIONS
ENGLISH
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