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stack (i.e. the tone network lies before the
channel’s main gain stage). The reverse (i.e.
the tone network being aer the main gain
stage) is typical of most Marshall ampliers
and, as a result, the CLEAN channel’s tone
controls work in a slightly dierent way than
you might expect; in addion to controlling
the tone of the channel they also aect how
it reacts in terms of gain, allowing you to
shape how the signal distorts.
For example, turning up the MIDDLE
control on higher GAIN sengs will focus
the distoron there, making your sound
‘sing’ in a tradional blues/rock way. Also,
because of the channels’ ‘tone then gain’
topology, when a lot of GAIN is dialled in
(especially in the case of the red mode), it
may appear that its tone controls aren’t
doing as much as you’d expect or sound
over distorted. This is because the signal
is being distorted aer the tone stage,
minimising the eecveness of the BASS,
MIDDLE and TREBLE controls.
3. CRUNCH CHANNEL
At this point JVM4 reverts to the
more typical Marshall preamp circuit
characterisc of ‘gain then tone’. This is
also true of the OD1 and OD2 channels.
GAIN
0 10
GAIN
INPUT
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