Manual Marshall JCM 900 - 4100 (page 6 of 40) (English, German, French, Spanish)

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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

2. 3 4. 5. 6. 7.

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Marshall JCM 900 - 4100 Manual

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