Marshall Amplification JTM30 Manuale utente

JTM Series

JTM30

Valve Combo

Handbook

Marshall Amplification plc

Denbigh Road, Bletchley, Milton Keynes, MK1 1DQ, England

Tel: (01908) 375411

Fax: (01908) 376118

Web Site - http://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.

Jan ‘99

WARNING!

Please read the following list carefully.

ALWAYS fit a good quality mains plug conforming to the latest B.S.I.

standards where necessary (UK only).

ALWAYS wire the plug according to the colour code attached to the

mains lead.

NEVER under any circumstances operate the amplifier without an

earth.

NEVER attempt to by-pass the fuses or fit ones of the incorrect value.

NEVER attempt to replace fuses or valves with the amplifier connected

to the mains.

DO NOT attempt to remove the amplifier chassis, there are no user

serviceable parts.

ALWAYS have this equipment serviced or repaired by competent

qualified personnel.

NEVER use an amplifier in damp or wet conditions.

DO NOT switch the amplifier on without the loudspeaker connected

and ensure that any extension cabinets used are the correct impedance.

DO NOT obstruct airflow around amplifier.

PLEASE read this instruction manual carefully before switching on.

Introduction

Marshall Amplification has been inextricably linked with valve

amplification since our very beginning in 1962. Products such as the original

Bluesbreaker combos, JTM 45 and Super-Lead heads were all destined to

be, and have become, classics in their own right. All of these special

Marshalls produced their magical tone by driving the guitar through an all

valve pre-amp into a pure valve power-amp. The JTM 30 carries on this

grand tradition but meets the demands of contemporary guitarists by

providing features such as channel switching, reverb, effects loop and

Speaker Emulated output.

Using the JTM 30

The JTM 30 is easily capable of

producing a wide range of useable

quality tones, from glassy vintage

clean, Bluesbreaker type singing

lead and crunchy chord work to full

blown modern high gain crush.

What’s more the controls are

simple and intuitive to use.

While one should always bear in

mind that taste in tone is a very

subjective matter here follows a

few simple suggestions for getting

some great sounds from your

JTM 30.

Clean: Make sure you select the

Normal channel on the JTM 30.

This is indicated by the green

L.E.D. The strength and height of

your pick-ups will have a great

influence on the level you should

set the volume on this channel

before overdrive sets in. Generally

speaking the volume control

should be set below half way for

totally clean sounds.

Vintage Overdrive: Switch to the

Boost channel which is indicated

by the Red L.E.D. Again pickups

will obviously influence settings

but you will probably find that gain

settings of around 5 or 6 are quite

adequate, the key however is to

increase the master volume level.

As our vintage amps didn’t really

have a lot of pre-amp gain

guitarists used to crank the volume

up to be heard which resulted in

the natural classic Marshall

overdrive roar.

Alternatively the clean Channel

with its volume on maximum gives

a very satisfying vintage type

overdrive.

As far as tone settings go we

would suggest that you start with

the tone controls set at about 5 and

then adjust to taste from there.

Modern Hi-Gain: Switch to the

Boost channel indicated by the Red

L.E.D.

Turn the gain up to full and set the

volume for the desired level. Tone

controls are set to taste, though

probably with the Middle control

lower than the Bass and Treble

controls.

The best advice we could really

offer is to simply experiment and

above all enjoy the pure valve tone

of your Marshall JTM 30.

Front Panel Functions.

1) Footswitch Jack

Jack socket for connection of P801

Footpedal for channel switching.

2) Push Channel Switch

Push switch for panel switching of the

channel. The Push Switch is inoperative

when the Footswitch is connected.

3) Input Jack

Jack socket for the input of the guitar.

4) Volume Control

Controls the Volume of the Normal channel.

5) L.E.D.

Indicates channel. Green-Normal

Red-Boost.

6) Gain Control

Controls the amount of Gain on the Boost

channel.

7) Volume Control

Controls the Volume of the Boost channel.

8) Bass Control

Dictates the amount of low frequency in the

overall tone.

9) Middle Control

Controls the middle frequencies.

10) Treble Control

Controls the upper or treble frequencies in

your tone.

Note:

The Tone Controls are interactive

and adjusting one can effect the

relative amounts of the others.

Experimentation is the best way of

finding your own personal

favourites.

11) Effects Send Jack

Jack socket for connection to the input of an

external effects processor.

12) Effects Return Jack

Jack socket for the connection from the

output of an external effects processor.

13) Reverb Control

Controls the amount of Reverb on both

channels.

14) Volume

Controls the master or overall volume of the

JTM 30.

15) Standby Switch

Controls the H.T. supply to the valves and

allows the valves to remain heated when not

in use.

16) Power Switch

On/Off switch for mains power to the

amplifier.

Note:

To prolong the life of the valves it

is always advisable to switch on

the Mains Power Switch (item 16)

about 2 minutes before switching

on the Standby (item 15).

This allows the valves to heat up to

full working temperature before

use. On switching off, the Standby

should always be switched before

the Power Switch.

Rear Panel Functions.

1) Mains Fuse

Protects the amplifier and mains supply in

the event of a fault.

2) Mains Input

Connects the amplifier to the mains power

supply.

3) Emulated Output

The Emulated Output captures the tonality

of Vintage loudspeakers like no other D.I.

output. Furthermore this output is

unaffected by the Master Volume control,

therefore allowing the JTM 30’s output to be

turned off whilst still providing silent

recording facilities.

The D.I. output is via an XLR type

connector, which allows this system to be

fed into either (a) a line level balanced input,

(b) a line level unbalanced input or (c) a low

level unbalanced.

✪ Please refer to the following

JTM 30 XLR Out diagram

(Page 6-7) for correct connections.

4) Internal Speaker Output Jack

For connection to internal 16 Ohm speaker.

5) External Speaker Output Jack

For connection to an external 16Ohm

speaker only (such as the Marshall JTM

112C 1x 12” extension cabinet).

Note:

The JTM 30 will deliver 30 Watts

into either one or two 16 Ohm

speakers, ie 16 or 8 Ohm total

impedance. The unit should not be

driven into a load of less than

8 Ohms.

MAINS FUSE

230V—T1.6A

120V—T3A

CAUTION! Replace fuse with same type and

rating only disconnect mains supply before

opening.

ATTENTION! Replacer le fusible par le

meme type et le meme calibre Debrancher a la

prise secteur avant D,ouvrir.

WARNING! No user serviceable parts inside; refer

servicing to qualified personnel only.

AVIS! Risque de choc. Ne pas ouvrir.

WARNING! Fire & Shock Hazard: Do not expose

this unit to rain or moisture. This Apparatus Must Be

Earthed. Do not open.

OUTPUT

EMULATED

OUTPUT

Pin 1—OV

Pin 2—High

Pin 3—Low

Refer to manual

for details Internal Extension

Manufactured in Great Britain by:

Marshall Amplification plc, Bletchley,

Milton Keynes, England.

30 watts RMS into 8/16Ω.

16Ωextension speaker

16Ωinternal speaker

(Refer to manual for details)

MAINS INPUT

230V ~50 Hz

160 Watts

BOOST

VOLUME

STANDBY

POWER

FOOT

SWITCH TONE

BASS MIDDLE TREBLE SEND RETURN REVERB VOLUME

LOOP MASTER

VOLUME

INPUT

2 8

10 0

2 8

10 0

2 8

10 0

2 8

10 0

2 8

10 0

2 8

PUSH

CHANNEL

RED

GREEN

10 0

2 8

GAIN

NORMAL

3030

JTM 30 Front Panel

JTM 30 Rear Panel

JTM 30 XLR Out diagram ✪

1 2 4 6

5 7 9 10 11 12 13 14 15 16

34 5

1 2

XLR Channel Input On Mixer

(Note: Line Level-Approx OdBV)

2 Core Screened Balanced Mic Lead

Unbalanced XLR to Jack Screened Lead

Jack Plug Line Level Jack Input On Mixer Etc.

Jack Plug

Low Level Jack Input On Mixer (ie

Mic Input)

Indice

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