Marshall JMP-1C, JMP-1H Owner`s Manual

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 specifi c 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 refl ected 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

The JMP-1H head and JMP-1C 1 x 10" combo
are all-valve 1-watt amplifi ers specifi cally
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

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

signifi cantly more, should you need to do so.
Leads the sonic mainstay of many of the ’70s
most popular and infl uential artists.

The combo is loaded with a Celestion G10N

10" 16Ω speaker which delivers the desired tonal
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)

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.
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 amplifi er is compatible with your electrical supply. If you have any doubt, please seek help from
a qualifi ed technician – your Marshall dealer can help you in this respect.

Mains Input & Fuse:

Your amplifi er is provided with either a detachable mains (power) lead which should be connected to the mains input socket on the rear panel
of the amplifi er or a fi xed mains (power) lead attached to the rear of the amplifi er.
The specifi c mains input voltage rating that your amplifi er has been manufactured for is indicated on the rear panel of the amplifi er.
The correct value and type of mains fuse for valve amplifi ers is specifi ed on the rear panel of the amplifi er.
NEVER attempt to bypass the fuse or fi t one of the incorrect value or type.

Transporting your equipment:

Please ensure that your amplifi er 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 amplifi er. See the Speaker Output guides in this handbook, if applicable, for specifi c 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 amplifi er.

2. Ensure that the VOLUME controls on the front panel are set to zero.

3. For amplifi ers provided with a detachable mains (power) lead, connect the supplied mains (power) lead into the MAINS INPUT on the rear

panel fi rst 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 amplifi er, 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.

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.

This equipment has been tested and found to comply with the requirements of the EMC Directive

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ENGLISH