Marshall Amplification JCM 900 4100 Bedienungsanleitung

JCM 900

4100

OWNER’S MANUAL

The JCM900 4100 was ﬁrst made

in 1990 in response to the perennial

problem of ‘not enough gain’. At the

time, guitarists were hot-rodding their

Marshall amps to achieve higher levels

of gain, which was expensive and far

from reliable. And so Marshall set to

work on a remedy.

Designing an ampliﬁer with masses of

gain is relatively straight forward. The

art is to make a high gain ampliﬁer that

is not excessively noisy, is reliable and

retains great tone. After a period of

extended R&D, Marshall provided the

world with the answer: the JCM900

Series.

“Shredders of the world, please note:

The JCM900 saves you the trouble of

having your amp hot-rodded.”

- Guitar Player Magazine, 1991.

The British made, all-valve 4100

is not only designed to be high

gain, it is designed to be versatile,

with two independently controlled

footswitchable channels, each with its

own distinct voicing, Master Volume and

footswitchable Reverb.

Channel A is voiced for brilliant clean

tones when the Gain control is set lower.

Turn up the Gain for crunch and more

driven tones. Channel B is boosted

with enough Gain for fearsome lead

tones, ranging from classic lead on

lower settings to screaming shred on

maximum.

The 100 Watt 4100 uses four high

quality 5881 output valves for their

unique harmonic distortion properties,

as well as two ECC83 valves in the

preamp. With most valve ampliﬁers,

particularly Marshalls, the best sounds

are achieved when, along with the

preamp Gain cranked, the Master

Volume is set high enough to overdrive

the output valves.

It is the delicate working balance

between the preamp and the power

stage of the ampliﬁer, and the interaction

between the EQ controls, that will

determine the sonic character produced

by the 4100 – experiment to ﬁnd your

sound.

Thank you for choosing Marshall and

we sincerely hope that your JCM900

4100 Hi Gain Dual Reverb ampliﬁer will

provide you with countless hours of ‘hot-

rodded’ tone.

INTRODUCTION

OVERVIEW

FOLLOW ALL INSTRUCTIONS AND HEED ALL WARNINGS

KEEP THESE INSTRUCTIONS

ENGLISH

WARNING:

Before going any further, make sure

that your ampliﬁer is compatible with

your electricity 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 a

detachable mains (power) lead which

should be connected to the Mains Input

socket on the rear panel 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 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, unplugged from the mains

electricity supply and all removable

cables have been disconnected from

your equipment before attempting to

move it.

IMPORTANT SET UP INFORMATION:

1. Make sure that the speaker

cabinet(s) impedance matches that of

the ampliﬁer. See IMPEDANCE

SELECT in this manual (Rear Panel

Functions #6). Always use a proper

speaker cable. Never use a screened

(shielded) guitar cable for this

purpose.

NOTE: Before connecting or

disconnecting the speaker cabinet(s)

you MUST switch the ampliﬁer off

and disconnect it from the mains

electricity supply. Switching on

without a speaker plugged in will

damage the ampliﬁer.

2. Ensure that the VOLUME controls on

the front panel are set to zero.

3. Connect the supplied mains (power)

lead into the MAINS INPUT on the

rear panel ﬁrst and then into the

mains electricity supply. (Rear Panel

Functions #13)

4. Plug your guitar into the INPUT jack

socket on the front panel.

5. Turn the front panel POWER on

(Front Panel Functions #15) and wait

for a few minutes before going to

point 6 below,

6. After waiting, engage the STANDBY

switch (Front Panel Functions #14).

7. Turn the VOLUME controls up to

your preferred level and your amp is

ready to play.

WARNING! IMPORTANT SAFETY INSTRUCTIONS

1. INPUT

Connects the instrument to the

ampliﬁer. (Use a high quality screened

lead).

2. CHANNEL A PREAMP GAIN

Sets the GAIN level for CHANNEL A.

Lower settings for clean sounds, higher

settings for medium drive and crunch.

3. CHANNEL B LEAD GAIN

Sets the GAIN level for the boosted

CHANNEL B. Lower settings for more

classic lead tones, higher settings for

maximum drive and sustain.

4, 5, 6, & 7. TREBLE, MIDDLE, BASS &

PRESENCE

Passive rotary EQ circuit. The

interactive controls provide a wide

range of tonal variation for both

channels.

8. CHANNEL A REVERB

Controls the amount of REVERB on

CHANNEL A.

9. CHANNEL A MASTER VOLUME

Controls the overall VOLUME level of

CHANNEL A.

10. CHANNEL B REVERB

Controls the amount of REVERB on

CHANNEL B.

11. CHANNEL B MASTER VOLUME

Controls the overall VOLUME level of

CHANNEL B.

12. CHANNEL B ‘ON’ PUSH SWITCH/LED

Indicates red when CHANNEL B is

selected either manually or by remote

footswitch.

13. FOOTSWITCH

Connects the remote dual footswitch for

Channel A/B switching and Reverb On/

Off (part # PEDL-91004).

14. STANDBY SWITCH

This switch is used in conjunction with

the mains POWER switch (item #15) to

‘warm up’ the ampliﬁer before use and

to prolong the life of the output valves.

When powering up the ampliﬁer always

FRONT PANEL FUNCTIONS

POWER STANDBY VOLUME REVERB

VOLUME REVERB PRESENCE BASS MIDDLE TREBLE LEAD GAIN GAIN

INPUT

FOOT

SWITCH

MASTER

(CH. B)

PUSH ON

(CH. B)

MASTER

(CH. A)

PREAMP

(CH. B)

PREAMP

(CH. A)

Model 4100

010

4 6

8 2

010

4 6

010

8 2

010

4 6

010

4 6

010

4 6

010

4 6

010

4 6

020

812

16 2

4 6

15. 14. 13. 12. 11. 10. 9.

POWER STANDBY VOLUME REVERB VOLUME

REVERB PRESENCE BASS MIDDLE TREBLE LEAD GAIN GAIN

INPUT

FOOT

SWITCH

MASTER

(CH. B)

PUSH ON

(CH. B)

MASTER

(CH. A)

PREAMP

(CH. B)

PREAMP

(CH. A)

Model 4100

010

4 6

8 2

010

4 6

8 2

010

4 6

010

4 6

010

4 6

010

4 6

010

4 6

020

812

16 2

4 6

engage the mains POWER switch ﬁrst

(1), leaving the STANDBY switch to the

STANDBY position (0).

This allows the application of the voltage

required to heat the valves to their

correct operating temperature. After

approximately two minutes the valves

will have reached the correct operating

temperature and the STANDBY switch

can be engaged (1).

In order to prolong valve life, the

STANDBY switch alone should be used

to turn the ampliﬁer on and off during

breaks in performance.

15. POWER

This is the on/off switch for the mains

power to the ampliﬁer. When it is

switched on (1), the switch will light

red. Please ensure that the ampliﬁer is

switched off (0) and unplugged from the

mains electricity supply before being

moved.

FRONT PANEL FUNCTIONS (CONT.)

8. 7. 6. 5. 4. 3. 2. 1.

1. LOOP LEVEL

Adjusts the level of the FX Loop from

-10dBV to +4dBu. Higher settings

match modern FX processors and

lower settings match ﬂoor FX pedals.

NOTE: Some FX such as Distortion

and Compressor are best suited to

connection via the front panel INPUT

jack socket.

2. SEND

Connect to the input of an external FX.

3. RETURN

Connect to the output of an external FX.

4. RECORDING COMPENSATED LINE OUTPUT

Use this jack socket for direct

connection to recording equipment or

PA system. The signal is specially ﬁltered

for optimum recording performance.

5. DIRECT LINE OUTPUT

Unﬁltered preamp signal for connection

to an external power ampliﬁer. NOTE:

Using the DIRECT LINE OUTPUT does

not omit the need for a speaker load

to be connected to the 4100 output

stage. See item #1 in Important Setup

Information in this manual.

6. IMPEDANCE SELECTOR

Two-way switch for matching ampliﬁer

and speaker impedance.

7. LOUDSPEAKERS

Parallel wired jack sockets for

connecting speaker cabinet(s). Ensure

that the speaker cabinet(s) is easily

capable of handling the full ampliﬁer

power and that the impedance is

correctly selected (item #6). If in any

doubt, consult your Marshall dealer for

advice.

8. MODE

Switches the ampliﬁer from HIGH to

LOW power output. The LOW setting

conﬁgures the output stage to ‘triode’

operation which halves the rated output.

The HIGH power position conﬁgures the

ampliﬁer to ‘pentode’ operation for full

100 Watt rated power output. NOTE:

Switching to lower power will not half

the volume of the ampliﬁer. The purpose

of this feature is to alter the ampliﬁer’s

MAINS INPUT FUSE

120V ~ 60Hz

375 Watts

EFFECTS

SEND

HIGH LOW

LOOP

LEVEL

RETURN RECORDING

COMPENSATED

DIRECT

(4)16 8

HIGH LOW

FAIL

OPV-1-4 OPV-2-3

DO NOT USE WITHOUT

CONNECTING SPEAKER LOAD

SEE MANUAL FOR CORRECT

OPERATION AND RATING

T500mA T500mA

220/240V - T2A

110/120V - T4A

FAIL

LINE OUTPUT POWER LEVEL

OUTPUT

VALVE FUSE

WARNING!:

SHOCK HAZARD. DO NOT OPEN.

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO

RAIN OR MOISTURE. THIS APPARATUS MUST BE EARTHED.

AVIS!:

RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR. POUR EVITER LES RISQUES

D’INCENDIE ET DE DECHARGES ELECTRIQUES, N’EXPOSEZ JAMAIS CET APPAREIL A L’HUMIDITE

OU A LA PLUIE. CONNECTER CET APPAREIL A LA TERRE.

CAUTION!:

TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER.

NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

ATTENTION!:

POUR EVITER LES RISQUES DE DECHARGES ELECTRIQUES, NE PAS

OUVRIR LE COUVERCLE. CET APPAREIL NE COMPORTE AUCUNE PIECE SUSCEPTIBLE D’ETRE

REPAREE PAR VOS SOINS. FAITES TOUJOURS APPEL A UN TECHNICIEN QUALIFIE POUR TOUTE

REPARATION.

OUTPUT :

100 WATTS RMS INTO 8Ω

Made in England by

Marshall Amplification plc,

Bletchley, Milton Keynes, England.

IMPEDANCE

SELECT

MODE

LOUDSPEAKERS

100W

R.M.S.

WARNING:

DO NOT OBSTRUCT VENTILATION GRILLES

ATTENTION:

NE PAS OBSTRUER LES GRILLES DE VENTILA

TION

REAR PANEL FUNCTIONS

1. 2. 3 4. 5. 6. 7.

MAINS INPUT FUSE

120V ~ 60Hz

375 Watts

EFFECTS

SEND

HIGH LOW

LOOP

LEVEL

RETURN RECORDING

COMPENSATED

DIRECT

(4)16 8

HIGH LOW

FAIL

OPV-1-4 OPV-2-3

DO NOT USE WITHOUT CONNECTING

SPEAKER LOAD

SEE MANUAL FOR CORRECT OPERA

TION AND RATING

T500mA T500mA

220/240V - T2A

110/120V - T4A

FAIL

LINE OUTPUT POWER LEVEL OUTPUT

OUTPUT

VALVE FUSE

WARNING!:

SHOCK HAZARD. DO NOT OPEN.

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO

RAIN OR MOISTURE. THIS APPARATUS MUST BE EARTHED.

AVIS!:

RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR. POUR EVITER LES RISQUES

D’INCENDIE ET DE DECHARGES ELECTRIQUES, N’EXPOSEZ JAMAIS CET APPAREIL A L’HUMIDITE

OU A LA PLUIE. CONNECTER CET APPAREIL A LA TERRE.

CAUTION!:

TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER.

NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

ATTENTION!:

POUR EVITER LES RISQUES DE DECHARGES ELECTRIQUES, NE PAS

OUVRIR LE COUVERCLE. CET APPAREIL NE COMPORTE AUCUNE PIECE SUSCEPTIBLE D’ETRE

REPAREE PAR VOS SOINS. FAITES TOUJOURS APPEL A UN TECHNICIEN QUALIFIE POUR TOUTE

REPARATION.

OUTPUT :

100 WATTS RMS INTO 8Ω

Made in England by

Marshall Amplification plc,

Bletchley, Milton Keynes, England.

IMPEDANCE

SELECT

MODE

LOUDSPEAKERS

100W R.M.S.

WARNING:

DO NOT OBSTRUCT VENTILATION GRILLES

ATTENTION:

NE PAS OBSTRUER LES GRILLES DE VENTILA

TION

tonal character and playing feel.

9. & 10. VALVE FAILURE LED (OPV1 – 4)

VALVE FUSE (OPV1 – 4)

In the case of output valve failure

the fuse (item # 10) will operate,

illuminating the FAIL LED (item # 9).

This fuse applies to output valves 1 & 4.

The ampliﬁer will continue to function

on reduced power – valves 2 & 3 only. In

this event service should be obtained as

soon as possible to prevent premature

aging of output valves 2 & 3.

11. & 12. VALVE FAILURE LED (OPV2 – 3)

VALVE FUSE (OPV2 – 3)

Similar functions to items #9 & #10

above, but applying to output valves 2

& 3.

13. MAINS INPUT

Connects the ampliﬁer to the mains

power supply. NOTE: Always ensure

that the incoming mains voltage

matches that of the ampliﬁer. If in doubt

consult your Marshall dealer.

14. MAINS POWER FUSE

Protects the ampliﬁer and mains supply

in the event of a fault. NOTE: Always

ensure that the fuse value matches the

labelling on the ampliﬁer rear panel. If in

doubt consult your Marshall dealer.

REAR PANEL FUNCTIONS (CONT.)

8. 10.9. 12.11. 14.13.

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