OWNER’S MANUAL
JVM-1H and JVM-1C
Limited Edition, 50th Anniversary, all-valve 1-Watt Head and Combo
commemorating the 2000s decade of Marshall
Overview
This is only the second Marshall product manual in living memory not to include an introduction
from our Guv’nor, the late, great Jim Marshall. Although the JVM-1H & JVM-1C had been blessed
by Jim both sonically and visually, he left us to go to a far better place before we started work on
the manual. That said, a couple of choice quotes from our much missed leader are included.
Thank you for purchasing this JVM1, one of a Limited Edition Series of British made, all-valve,
1-Watt amps celebrating Marshall’s 50th Anniversary. All told, this series comprises of five different
pairs of heads and combos, each pairing paying tribute to the sound and aesthetic of one of the
five decades that make up our first 50 Years of Loud. The JVM-1 you are the proud owner of is
our homage to the most recent decade, the 2000s. Although several critically acclaimed Marshalls
were released between 2000 & 2010, the all-valve standout was definitely the JVM Series. Critics
quickly hailed it as “the most versatile Marshall ever” with the “most heinous high-gain profanity
imaginable.”
“The JVM Series is definitely our all-valve flagship from that period so that’s what we should pay
tribute to,” Jim stated while we were finalising the 1-Watt Series. Decision made!
Jim always closed his introductions with “We sincerely hope you enjoy your new amp. We know it
will bring you countless hours of playing pleasure.” We wish you the same.
Welcome to the Marshall family!
Sincerely,
The Marshall Team
The JVM-1C and JVM-1H are all-valve, 1-Watt
amplifiers voiced to reproduce the sounds of
the Marshalls of the 2000s but at what Jim liked
to call a ‘home friendly’ volume.
The JVM-1’s two channels,
Clean and OD, share the
same tone controls. The Clean channel will
provide you with sparkling cleans and a nice
bluesy edge when you crank the volume.
As already mentioned, there were a number of
very successful Marshall amps produced in the
2000s but the JVM was the true standout.
Dubbed as the “latest flagship” by Jim himself,
The OD channel gives you the “most heinous
high-gain profanity imaginable” that the JVMs
are renowned for! These two channels are
footswitchable via the supplied footswitch.
this amp was heaped with critical acclaim. In
addition to being hailed the “most versatile
Marshall ever” and having “profane” high gain,
its sparkling cleans also drew much praise.
The JVM-1s have been designed to provide
these distinctive tonal characteristics at the
surprisingly loud level of 1-Watt.
In addition to the standard Treble, Middle
and Bass controls, the Presence knob and
Resonance switch further add to the tonal
flexibility of your amp. The FX Loop
and Speaker Emulated Output found on
the rear panel both add to the versatility of the
JVM-1s.
To add further to the ‘home friendly’ nature
of this amp, whenever the full 1-Watt output
proves too loud you can hit the Low Power
button on the rear panel to further drop the
volume, enabling you to crank the volume to
get the tone you desire.
The combo is fitted with an 8” Celestion
speaker, specially voiced to provide the best
balance between a compact size and a full
sound. Both amplifiers are also very happy
driving a full 4x12” cabinet for the ultimate in
mini 1-Watt JVM tone.
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 POWER 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.
EUROPE ONLY – Note:
(Environments E1, E2, and E3 EN 55103-1/2) and the Low Voltage Directive in the E.U.
The average half-cycle r.m.s. inrush current, on initial switch-on, is 1.1 amps
The average half-cycle r.m.s. inrush current after a supply interruption of 5 s is 1.0 amp
This equipment has been tested and found to comply with the requirements of the EMC Directive
ENGLISH
1
Front panel
Front panel continued
1 2 3 4 5 6 7 8 9 10 11
*NOTE: The JVM-1H front panel is illustrated.
The JVM-1C panel is identical but runs in the
opposite direction.
IMPORTANT. Read before powering-up:
Before powering-up your Marshall JVM1 amplifier, you must ensure that an
appropriate speaker cabinet is connected
to the corresponding impedance matched
loudspeaker jack on the rear panel, (unless
‘Low Power’ mode is selected). Failure to do so
could result in serious damage being caused
to your amplifier. Always use an unscreened
(unshielded) loudspeaker cable to connect an
amplifier to a loudspeaker cabinet, never use
a screened (shielded) guitar cable. After use,
always allow the amp to cool down before
moving.
IMPORTANT NOTE: Please refer to the Warning
plate on either the underside, or the rear of the
product.
1.Power Switch
This is the On/Off switch for the mains electric
power to the amplifier. This switch lights up
whenever the amp is switched on (and it is
plugged into the mains, of course!).
NOTE: Please ensure the amplifier is switched
off and unplugged from the mains electricity
supply whenever it is moved!
NOTE: Please allow a minute or so for the amp
to ‘warm-up’ after switching on. This is normal
with valve amplifiers as valves need to reach
their ‘working temperature’ to operate properly.
2. Resonance Switch
This adds a fixed amount of resonant bass
boost to your sound.
11. Input
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. Your screened cable should be
Rear panel*
3. Presence
Emphasises the high frequencies, adding
‘Presence’ to the sound.
4. Bass
This control adjusts the amount of low
frequencies (bottom-end) in your sound.
5. Middle
This controls the mid-range of your sound.
Turning this up will make your guitar sound
fatter and fuller. Turning this down will make the
sound more ‘scooped’.
6. Treble
This controls the amount of high frequency
(top-end) that is present in your sound. Higher
settings increase the ‘brightness’ of your tone,
while lower settings make the sound softer and
less defined.
NOTE: The Treble, Middle and Bass controls
are highly interactive; adjusting one of them will
change the frequencies and range of the other
controls.
7. OD Volume
Controls the volume of the OD channel.
8. OD Channel Gain
Controls the gain of the OD channel.
9. Clean/OD Channel Selector
Selects which channel is being used. It is
overridden if the footswitch is being used. The
LED glows green when Clean is selected, and
red for OD.
*NOTE: The JVM-1H rear panel is illustrated.
The JVM-1C panel is identical but runs in the
opposite direction.
1. Footswitch
By connecting the supplied footswitch to this
jack you can footswitch between Clean and OD
channels. The footswitch will override the front
panel Channel switch (9 on page 2).
2. Return
For connection from the output of an external
effects processor or stompbox.
3. Send
For connection to the input of an external effects
processor or stompbox.
4. Emulated Line Out
A speaker emulated line out for recording or live
use.
5. High/Low
When activated (in) this switch drops the output
power to 0.1-Watts. Perfect for late night,
‘neighbour friendly’ practice.
JVM-1H and JVM-1C Technical Specifications
JVM-1H JVM-1C
Power (RMS) 1W 1W
32
Valves 2 x ECC82 + 3 x ECC83 2 x ECC82 + 3 x ECC83
10. Clean Channel Volume
Controls the volume of the Clean channel.
Dimensions (mm) H , W, D 180 x 380 x 195 360 x 380 x 220
Weight (kgs) 5.5 8.9
2 3
41
of good quality. If you are in
any doubt regarding this, your
Marshall dealer will be more than
happy to help and advise you.
ENGLISH
6 75
6. Speaker Output
1-Watt @ 16Ω (8Ω minimum) – the label says it all.
7. Mains Input
Your amplifier 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 ask the advice of 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.
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