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Front panel
1
2
3
4
*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 JVM-
1 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.
5
6
7
8
9
10
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.
10. Clean Channel Volume
Controls the volume of the Clean channel.
2
Front panel
continued
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*
11
1
*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
Power (RMS)
Valves
Dimensions (mm) H , W, D
Weight (kgs)
of good quality. If you are in
any doubt regarding this, your
Marshall dealer will be more than
happy to help and advise you.
2
3
4
5
6
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.
JVM-1H
1W
2 x ECC82 + 3 x ECC83
2 x ECC82 + 3 x ECC83
180 x 380 x 195
5.5
3
7
JVM-1C
1W
360 x 380 x 220
8.9
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