Manual Marshall JVM410 Series (page 4 of 8) (English)

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Channel Overview

The JVM’s front panel is divided into 2 main

sections: Channels and Master. Each of its 4

channels has 3 modes which are distinguished

by a different coloured light (green, orange or

red) appearing in the respective MODE switch;

the preamplifier’s gain structure is uniquely

reconfigured for each and every mode.

1. CLEAN CHANNEL

CLEAN GREEN MODE: This is the cleanest of

the three modes and, in keeping with traditional

clean amps it uses a simple and straightforward

circuit, keeping the signal as pure as possible.

In this Mode the channel’s Volume control is

taken out of circuit as is the case in vintage

amplifiers of this nature. This is the only JVM

mode where this happens.

CLEAN ORANGE MODE: By adding another

gain stage after the tone stack we get a

punchier sound that’s easy to overdrive. As in

the rest of the modes the channel's Volume

control is now active.

CLEAN RED MODE: This mode pushes the

original clean sound even more and transforms

itself into a pseudo high gain channel with the

addition of yet another gain stage after the tone

stack.

In keeping with the classic clean amps of

yesteryear, all three modes of this channel

feature what is known as a pre-gain tone stack

(i.e. the tone network lies before the channel's

main gain stage). The reverse (i.e. the tone

network being after the main gain stage) is

typical of most Marshalls and, as a result, the

Clean channel's tone controls work in a slightly

different way than you might expect. In addition

to controlling the tone of the channel they also

affect how it reacts in terms of gain, allowing

you to shape how the signal distorts.

For example, turning up the Middle control on

higher Gain settings will focus the distortion

there, making your sound ‘sing’ in a traditional

blues/rock way. Also, because of the channels’

‘tone then gain’ topology, when a lot of gain is

dialled in (especially in the case of the RED

mode), it may appear that its tone controls aren't

doing as much as you’d expect or sound over

distorted. This is because the signal is being

distorted after the tone stage, minimising the

effectiveness of the Bass, Middle and Treble

controls.

2. CRUNCH CHANNEL

At this point the JVM reverts to the more typical

Marshall preamp circuit characteristic of ‘gain

then tone’. This is also true of the OD1 and OD2

channels.

CRUNCH GREEN MODE: This mode shares

the preamp topology of the classic Marshall

JTM45/1959 ‘Plexi’ models (i.e.: gain + gain +

tone) but with a bit more of gain than is found in

the originals.

CRUNCH ORANGE MODE: This mode is

reminiscent of the Marshall JCM800 2203

amplifier, a staple of hard rock. The gain

structure is gain + gain + gain + tone.

CRUNCH RED MODE: this shares the topology

of the Orange mode but with more gain, giving

you sounds similar to a hot-rodded JCM800.

3. OD1 CHANNEL

OD1 GREEN MODE: This is very similar to the

hot-rodded JCM800 sound found in ‘Crunch

Red’, allowing you to dial-in two distinctly

different yet similar crunch sounds if you so wish

- one in each channel.

OD1 ORANGE MODE: This adds another gain

stage to the ‘OD1 Green’ circuit, resulting in a

sound that’s perfect for singing leads and hard

rock/heavy metal tones.

OD1 RED MODE: Adds more gain to the ‘OD1

Orange’ for a high gain Marshall sound.

4. OD2 CHANNEL

This channel is similar to the OD1 channel but

with even more gain and a slightly different tone

network with the Middle control shifted down to

being centred around 500 Hz instead of the

more typical Marshall value of 650 Hz. The

result is 3 high gain modes that are ideal for

both lead and modern rhythm metal tones.

The Basics

We recommend that you fold out the inside back

cover of this manual so that diagrams of the

amp’s front and rear panels are visible while you

read.

MAINS INPUT & FUSE (16)

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.

WARNING: Before going any further, make

sure your amplifier is compatible with your

electrical supply. If you have any doubt,

please get help from a qualified technician -

your Marshall dealer can help you in this

respect.

The correct value of mains fuse is specified on

the rear panel of the amplifier. NEVER attempt

to bypass the fuse or fit one of the incorrect

value.

Mains (POWER) Switch (17)

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!

INPUT Jack Socket (18)

You must always use a screened (shielded)

guitar cable and never use an unscreened

(unshielded) speaker cable. Also, this cable

should be one of good quality. If you are in any

doubt regarding this, your Marshall dealer will be

more than happy to help and advise you.

Getting Started & Powering Up

1. Make sure that the speakers/cabinet(s) are

connected to the correct impedance

LOUDSPEAKER jack(s) on the rear panel (1).

See page 8 for specifics regarding impedance

matching. If you’re using an extension cabinet

make sure it’s powerful enough to handle a 100

Watt amp and also that you’re using a proper

speaker cable. Never use a screened (shielded)

guitar cable for this purpose

WARNING!

1. Failure to do any of the above will damage

your amp.

2. NEVER use your amp without a (speaker)

load attached when the Standby Switch is

ON.

Marshall recommends you always leave a

(speaker) load attached to the unit.

2. Ensure that both MASTER VOLUMES on the

front panel (6) are set to zero.

3. Connect the Footswitch Cable to the

Footswitch and then connect to the FOOTSWITCH

Socket on the rear panel of amplifier.

4. Connect the supplied mains (power) lead into

the MAINS INPUT on the rear panel first and

then into an electrical outlet.

5. Plug your guitar into the INPUT jack socket

on the front panel.

6. Turn the front panel POWER switch on. This

will glow red then wait for a couple of minutes.

7. After waiting a couple of minutes, engage the

STANDBY switch. Leaving the amp on ‘Standby’

for a period allows the valves to come up to

their correct operating temperature. In order to

prolong valve life, the STANDBY switch should

also be used to turn the amplifier on and off

during breaks in a performance.

STANDBY Switch & Silent recording (19)

As stated above the STANDBY Switch is used in

conjunction with the POWER Switch to ‘warm

up’ the amplifier before use and to prolong the

life of the output valves.

When the amplifier is in standby mode the

whole preamplifier section continues running at

its nominal voltages whilst the power amplifier

remains in a standby status. This allows the

amplifier to be used for silent recording or

preamplification purposes.

Only when the STANDBY is off can the amplifier

be used without a load.

Always ensure a load is

connected when leaving the silent recording

mode, i.e. when switching the STANDBY switch

ON.

ENGLISH

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Marshall JVM410 Series Manual

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