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Front panel
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2
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This is where you plug your guitar into the
1. Input Jack Socket
amp. You must use a screened (shielded) guitar
cable. Never use an unscreened (unshielded)
speaker cable. The input to any guitar amplifier
is a very sensitive part of the signal path and is
therefore susceptible to airborne radio
interference, hence the need for a screened
guitar cable. This screened cable should
preferably be of good quality. If you are in any
doubt regarding this, your Marshall dealer will
be more than happy to help and advise you.
This control sets the overall output volume of
2. Volume
the amplifier.
Tonal tip: It is practical to set this first to suit
the environment in which you are playing as
the position of the volume largely dictates the
optimum positions for the other controls.
This control determines the amount of high
3. Treble
frequency that is present and gives your guitar
tone a defining edge as it is turned up.
4
5
6
This controls the mid-range of your sound.
4. Middle
Turning this up will make your guitar sound
fatter and fuller.
This controls the amount of low frequencies
5. Bass
(bottom end) in your tone.
This red indicator will light up whenever the
6. Mains Indicator
amp is plugged into the mains and the Power
Switch (7) is on.
Note: Please allow a minute or so for the amp
to 'warm up' after switching on. This is
perfectly normal with valves as they need to
come up to their 'working temperature'.
This is the On/Off switch for the mains
7. Power Switch
electric power to the amplifier.
Note: Please ensure the amplifier is switched
off and unplugged from the mains electricity
supply whenever it is moved!
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Rear panel
7
1
1. Mains Input Socket with
Your amp is provided with a detachable mains
incorporated Mains Fuse
(power) lead, which is connected here. The
specific mains input voltage rating that your
amplifier has been built for is indicated on the
rear panel. Before connecting for the first time,
please ensure that your amplifier is compatible
with your electricity supply. If you have any
doubt, please get advice from a qualified
technician. Your Marshall dealer will help you
in this respect.
The correct value of mains fuse located in the
small drawer at the bottom of the mains
socket is specified on the rear panel of the
amplifier. The drawer contains a space for a
spare fuse.
NEVER attempt to bypass the fuse or fit one
of the incorrect value!
Note: It is wise to carry spare fuses at all
times.
This is the output used to feed a standard
2. Headphones Output Jack
commercial set of headphones.
The signal here is derived from the speaker
output with added filtering in order to include
the power amp and output transformer's
contribution to the overall tone.
A 16Ω dummy load is connected across the
headphone output to maintain the correct
'reflected' impedance for the power amp.
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4
3. Headphones/Extension Speaker
This switch selects the routing for the output
Selector switch
signal.
With the switch toward the 'Extension
Speaker' jack, only the internal speaker, or
extension speaker if used, will be active.
Nothing will appear at the 'headphones'
output.
With the switch toward the 'Headphones' jack,
only the headphones jack will be active. The
internal speaker or extension speaker will be
muted.
This is the output used to feed an alternative
4. Extension Speaker Output Jack 16Ω
16Ω extension cabinet, a typical example being
a Marshall 4 x 12". When connecting the
extension cabinet, the combo's internal speaker
is automatically disconnected.
ALWAYS ensure you use good quality speaker
(unshielded) cables. NEVER use guitar
(shielded) cables.
WARNING! Never use the amplifier without
a load (speaker cabinet/s) attached!
Always use a non-screened Marshall approved
speaker lead when connecting an extension
cabinet to these units.
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