OWNER’S MANUAL
JMP-1H and JMP-1C
Limited Edition, 50th Anniversary, all-valve 1-Watt Head and Combo
commemorating the 1970s decade of Marshall
Overview
From “the Guv’nor” Jim Marshall
Congratulations on purchasing one of our Limited Edition
series of 1-Watt heads and combos that celebrate Marshall’s
50th Anniversary. Each one is made in England with pride
and commemorates the distinctive tonal character, features
and iconic appearance of a specific decade – ’60s, ’70s, ’80s,
’90s and present day. This one is the second in the series and
represents the sounds of the Marshalls manufactured in the
company’s second decade of existence, the 1970s...
As you may know, the Marshall amps most prevalent in the
’70s were the 50-Watt 1987 head and, of course, the 100-Watt
1959 Super Lead head. While the 1959 is often referred to
as a “Plexi” because of the Plexiglass front panel used in the
’60s, we actually changed the material of the front panel to gold
anodised aluminium in the middle of 1969 for added robustness.
This is reflected in your 1-Watt head or combo, as is the use
of the now familiar JMP legend which stands for Jim Marshall
Products. In keeping with the company’s credo of listening to
what our customers want, by the time the ’70s arrived, the 1959
Super Lead had evolved into a much more aggressive sounding
amp than its mid ’60s predecessors.
The 1-Watt amp you now own pays homage to both the tone
and look of that pivotal second decade of Marshall’s history. It
also does so at an extremely “studio” or “home friendly” volume.
In keeping with the era, the front panel of your amp is simple,
but extremely effective. I’m sure that its touch responsive,
aggressive overdriven tones will give you countless hours of
playing pleasure.
Welcome to the Marshall family!
Yours Sincerely,
Jim Marshall
harmonic mojo from the circuit.
The added bonus is that you get
that distinctive Super Lead tone but
at the neighbour-friendly volume of 1-Watt. The
additional attenuation offered by the Low Power
button on your amp's rear-panel drops the power
significantly more, should you need to do so.
The combo is loaded with a Celestion G10N
10" 16Ω speaker which delivers the desired tonal
nuances effortlessly. Both head and combo have
options to drive external cabs with a choice of
16Ω or 8Ω. The combo’s internal speaker is
automatically disconnected when an external cab
is plugged into either output.
The JMP-1H and JMP-1C both utilise two
ECC83 (a.k.a. 12AX7) dual-triode valves to
shape the tone and gain structure in the preamp.
The Class-A, parallel single-ended power-amp
topology employs two ECC81 (a.k.a. 12AT7)
dual-triode valves to wring every last drop of
Follow all instructions and heed all warnings
KEEP THESE INSTRUCTIONS
Warning:
Before going any further, make sure that your amplifier is compatible with your electrical supply. If you have any doubt, please seek help from
a qualified technician – your Marshall dealer can help you in this respect.
Mains Input & Fuse:
Your amplifier is provided with either a detachable mains (power) lead which should be connected to the mains input socket on the rear panel
of the amplifier or a fixed mains (power) lead attached to the rear of the amplifier.
The specific mains input voltage rating that your amplifier has been manufactured for is indicated on the rear panel of the amplifier.
The correct value and type of mains fuse for valve amplifiers is specified on the rear panel of the amplifier.
NEVER attempt to bypass the fuse or fit one of the incorrect value or type.
Transporting your equipment:
Please ensure that your amplifier is switched off and unplugged from the mains electricity supply and that all removable cables have been
disconnected from your equipment before attempting to move it.
Important set up information:
1. Make sure that the cabinet(s)/speakers, where appropriate, are connected to the correct impedance LOUDSPEAKER jack(s) on the
rear panel of the amplifier. See the Speaker Output guides in this handbook, if applicable, for specific information regarding impedance
matching. When using an extension cabinet make sure that you are using a proper speaker cable. Never use a screened (shielded) guitar
cable for this purpose.
WARNING! Failure to do any of the above may damage your amplifier.
2. Ensure that the VOLUME controls on the front panel are set to zero.
3. For amplifiers provided with a detachable mains (power) lead, connect the supplied mains (power) lead into the MAINS INPUT on the rear
panel first and then into an electrical outlet.
4. Plug your guitar into the INPUT jack socket on the front panel.
5. Turn the front panel switch ON and, if a valve amplifier, wait a couple of minutes before going to point 6.
6. Turn the volumes up to your preferred level and your amp is ready to play.
This equipment has been tested and found to comply with the requirements of the EMC Directive
EUROPE ONLY – Note:
(Environments E1, E2, and E3 EN 55103-1/2) and the Low Voltage Directive in the E.U.
EUROPE ONLY – Note: The Peak Inrush current for the JMP-1H and the JMP-1C is 4.4A.
1
ENGLISH
The JMP-1H head and JMP-1C 1 x 10" combo
are all-valve 1-watt amplifiers specifically
designed and voiced to produce the sound
of Marshall products made in the 1970s. The
Marshalls of this decade had a solid, punchy mid,
a tight bottom-end and an aggressive yet musical
overdrive when “cranked”, making the Super
Leads the sonic mainstay of many of the ’70s
most popular and influential artists.
Front panel
Rear panel
ENGLISH
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1
2
3
4
5
6
NOTE: The JMP-1C front panel is illustrated. The
JMP-1H panel is identical but runs in the opposite
direction.
4. Bass
This controls the amount of low frequencies
(bottom-end) in your tone.
1. Input Jack Socket
This is where you plug your guitar into the 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 electrical 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.
NOTE: both the Treble and Bass controls are
passive - meaning that they only attenuate
(reduce) frequencies, they don't boost.
5. Mains Indicator
This red indicator will light up whenever the amp
is plugged into the mains and the Power Switch
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’.
2. Volume
This control sets the overall output volume of
the amplifier. Turning this control up will also
increase gain, adding distortion to the sound as
the various stages within are gradually overdriven
more and more. All valve guitar amplifiers exhibit
this desirable behaviour to varying degrees.
6. Power Switch
This is the On/Off switch for the mains electric
power to the amplifier.
NOTE: Please ensure the amplifier is switched off
and unplugged from the mains electricity supply
whenever it is moved!
3. Treble
This control determines the amount of high
frequencies (top-end or treble) that are present
and gives your guitar tone more high-end
definition and “cut” as it is turned up.
2
3
4
5
3. 16Ω Extension Speaker Output Jack
This is the output used to feed a 16Ω extension
cabinet, a typical example being a Marshall
4 x 12". When connecting an extension cabinet
to the combo, its internal 16Ω speaker is
automatically disconnected.
1. Mains Input Socket with mains fuse
Your amp is provided with a detachable mains
(power) lead, which is connected here. The
specific mains input voltage rating that your
amplifier has been built for is indicated on the
back 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.
4. 8Ω Extension Speaker Output Jack
This is the output used to feed an 8Ω extension
cabinet, a typical example being a Marshall
2 x 12". When connecting an extension cabinet
to the combo, its internal 16Ω speaker is
automatically disconnected.
The correct value of mains fuse located in the
small compartment at the bottom of the mains
socket is specified on the rear panel of the
amplifier. The compartment also contains a space
for a spare fuse.
NOTE: Plugging an extension cabinet into the
8Ω extension speaker output will automatically
disconnect the 16Ω extension speaker output.
This ensures the amplifier only ever drives one
load, i.e. 16Ω OR 8Ω.
NEVER attempt to bypass the fuse or fit one of
an incorrect value!
ALWAYS ensure you use good quality speaker
(unshielded) cables. NEVER use guitar (shielded)
cables.
NOTE: It is wise to carry spare fuses at all times.
2. Low Power Mode Switch
When the Low Power switch is engaged (i.e.
pushed in) it reduces the amp's maximum output
from 1-Watt to 0.02-Watts. This is more suitable
for environments where the volume needs to be
kept to a minimum.
5. Gain Boost Switch
Pushing this switch in adds another valve stage
to the signal path resulting in a sound that
contains more gain. This is more suitable for
heavy rock/metal styles and also soloing.
JMP-1H and JMP-1C Technical Specifications
JMP-1H
Power (RMS)
Valves
Dimensions (mm) H x W x D
Weight (kgs)
2
JMP-1C
1W
1W
2 x ECC83 + 2 x ECC81
2 x ECC83 + 2 x ECC81
180 x 380 x 195
360 x 380 x 220
5.2
9.4
3
Notes
Notes
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Denbigh Road, Bletchley, Milton Keynes MK1 1DQ England
Tel : +44 (0)1908 375411 Fax : +44 (0)1908 376118
www.marshallamps.com
Whilst the information contained herein is correct at the time of publication, due to our policy of constant improvement
and development, Marshall Amplification plc reserve the right to alter specifications without prior notice.
BOOK-00105-00 / 11 / 11
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