Marshall Amplification Musical Instrument Amplifier JCM600 User Manual

J CM Valve Com bos  
& J CM 600 Valve Head.  
 
WARNING!  
Please read the following list carefully.  
A. ALWAYS fit a good quality mains plug conforming to the latest B.S.I. standards where  
necessary (UK only).  
B. NEVER attempt to by-pass the fuses or fit ones of the incorrect value.  
C. NEVER attempt to replace fuses or valves with the amplifier connected to the mains.  
D. DO NOT attempt to remove the amplifier chassis, there are no user serviceable parts.  
E. ALWAYS have this equipment serviced or repaired by competent qualified personnel.  
F. NEVER use an amplifier in damp or wet conditions.  
G. DO NOT switch the amplifier on without the loudspeaker connected.  
H. ENSURE that any extension cabinets used are of the correct impedance.  
I. PLEASE read this instruction manual carefully before switching on.  
WARNING : This apparatus must be earthed!  
WARNING : Do not obstruct ventilation grille and always ensure free movement of air around  
the amplifier!  
Range Introduction  
JCM 600  
Marshall Am plification has been inextricably linked with valve am plification  
since our very beginning in 1962. Products such as the original Bluesbreaker  
com bos, J TM 45 and Super-Lead heads were all destined to be, and have  
becom e, classics in their own right.  
All of these special Marshalls produced their m agical tone by driving the guitar  
through an all valve pre-am p into a pure valve power-am p. The J CM 600 series  
carry on this grand tradition but m eet the dem ands of contem porary guitarists  
by providing features such as channel switching, reverb, effects loop and  
speaker em ulated output.  
Us in g Yo u r J CM 6 0 0 Am p lifie r  
Your J CM 600 Valve com bo or head is easily capable of producing a wide  
range of usable quality tones, from glassy vintage clean, Bluesbreaker type  
singing lead and crunchy chord work to full blown m odern high gain crush.  
Whats m ore the controls are sim ple and intuitive to use giving you instant  
access to m em orable Marshall tones.  
Whilst one should always bear in m ind that taste in tone is a very subjective  
m atter, the following suggestions will give you a good starting point for getting  
som e great sounds from your J CM 600 am plifier.  
Cle a n  
Make sure you select the Clean channel which 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 volum e on this channel before overdrive sets in. Generally  
speaking the volum e control should be set below half way for totally clean  
sounds.  
The tone network should be set with all three controls at 5 initially, then  
adjusted to suit the type of guitar and sound required. Generally single coil  
 
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pickups will require extra bass and m iddle to give the sound m ore body, but  
hum buckers m ay well require less m iddle and extra treble to cut through.  
Vin t a g e Ove rd rive  
Switch to the Overdrive 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  
m aster volum e level. As our vintage am ps didnt really have a lot of pre-am p  
gain guitarists used to crank the volum e up to be heard which resulted in the  
natural classic Marshall overdrive roar. Alternatively the Clean Channel with its  
volum e on m axim um 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. The selection of tone  
settings for single coil or hum bucking pickups will follow the sam e general  
pattern as for the clean sound.  
Mo d e rn Hi-Ga in  
Switch to the Overdrive channel indicated by the Red L.E.D.  
Turn the gain up to full and set the volum e for the desired level. Tone controls  
are set to taste, though probably with the Middle control lower than the Bass  
and Treble controls particularly to m aintain the definition when using  
hum bucking pickups.  
The best advice we could really offer is to sim ply experim ent and above all  
enjoy the pure valve tone of your Marshall J CM 600 am plifier.  
JCM 601, 602 & JCM600 Head  
Front Panel Functions  
1) Footswitch J ack  
7) Treble Control  
Jack socket for connection of P801 Footpedal  
for channel switching.  
Controls the upper or treble frequencies in the  
tone of the Clean channel.  
2) Push Channel Switch  
8) L.E.D.  
Push switch for panel switching of the  
channel. The push switch is inoperative when  
the footswitch is connected.  
Indicates channel. Green-Clean. Red-  
Overdrive.  
9) Gain Control  
3) Input J ack  
Controls the amount of Gain on the Overdrive  
channel.  
Jack socket for the input of the guitar.  
4) Volum e Control  
10) Volum e Control  
Controls the Volume of the Clean channel.  
Controls the volume of the Overdrive channel.  
5) Bass Control  
11) Bass Control  
Controls the lower frequencies or bottom end  
in the tone of the Clean channel.  
Controls the low end frequencies in the tone  
of the Overdrive channel.  
6) Middle Control  
12) Middle Control  
Controls the middle frequencies and fatness of  
the tone of the Clean channel.  
Controls the middle frequencies in the tone of  
the Overdrive channel.  
 
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correct type and rating. It is a wise precaution  
to always carry spares.  
13) Treble Control  
Controls the upper or treble frequencies in the  
tone of the Overdrive channel.  
2) Mains Input  
Connects the amplifier to the mains power  
supply.  
Please 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.  
3) Parallel FX Loop Return J ack  
Jack socket for connection from the output of  
an external effects processor.  
14) Parallel Effects Mix Control  
Please Note  
Governs the amount of effected signal in the  
overall tone when used in conjunction with  
external effects through the parallel loop (see  
items 3 and 4 of the JCM 600 rear panel  
functions).  
A parallel FX Loop is best suited for use with  
external effects processors which require a  
certain amount of dry or uneffected signal in  
the overall tone. Time based effects such as  
Delay and Chorus are typical examples of the  
effects best suited to this type of Loop.  
15) Clean Reverb  
Controls the amount of Reverb on the Clean  
channel.  
4) Parallel FX Loop Send J ack  
Jack socket for connection to the input of an  
external effects processor.  
16) Overdrive Reverb  
Controls the amount of Reverb on the  
Overdrive channel.  
5) Series FX Loop Return J ack  
Jack socket for connection to the output of an  
external effects processor.  
17) Volum e  
Controls the overall volume of the combo.  
6) Series FX Loop Send J ack  
Jack socket for connection to the input of an  
external effects processor.  
18) Standby Switch  
Controls the H.T. supply to the valves and  
allows the valves to remain heated when not  
in use.  
Note: The Series Loop is best suited to effects  
that require no dry signal such as  
Compressors or Graphic Equalisers.  
19) Power Switch  
7) D.I. Output  
On / Off Switch for mains power to the  
amplifier.  
The JCM 600’s D.I. Out is switchable  
between a speaker Emulated signal (pre the  
power amp), and a non Emulated (post the  
power amp ) signal.  
Please Note  
To prolong the life of the valves it is always  
advisable to switch on the Mains Power  
Switch (item 19) about 2 minutes before  
switching on the Standby (item 18).  
The Emulated Output captures the tonality of  
Vintage loudspeakers like no other D.I.  
furthermore this output is unaffected by the  
Master Volume controls therefore allowing  
the JCM 600’s output to be turned off whilst  
still providing silent recording facilities.  
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.  
The D.I. Output is via an XLR type connector  
which allows this system to be run into either  
(a) a line level balanced input (b) a line level  
unbalanced input or (c) a low level  
unbalanced input.  
JCM 601, 602 & JCM600 Head  
Please Note  
Rear Panel Functions  
Refer to the JCM 600 XLR Out diagrams  
(Below) for correct connections.  
1) Mains Fuse  
Protects the amplifier and mains supply in the  
8) Pre/Post Switch  
event of a fault.  
Allows Line Out selection between a speaker  
Emulated signal (pre the power amp) and  
non-emulated (post the power amp).  
Check the label on the back of the amp for the  
correct value. Always replace fuses with the  
 
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9) Presence Control  
Note  
This Master Presence control adjusts the  
amount of top end frequencies in the overall  
tone - adding crispness and bite.  
The JCM 600 combos and head will deliver  
60 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.  
10) Speaker Output  
On combo formats of the JCM 600 this jack  
is for connection to the internal 16 Ohm  
speaker. On the JCM 600 Head this socket is  
for connection to an external speaker cabinet,  
such as the purpose built JCM C410A  
compact 4x10” angled cabinet and/or the  
JCM C410B compact 4x10” base cabinet.  
If you unplug the internal loudspeaker in a  
JCM 600 combo it is possible to connect a  
single 8 Ohm cabinet to the extension  
Speaker Output only. However, when the  
internal speaker is connected only a 16 Ohm  
extension cabinet may be used.  
It is important to follow these instructions as  
failure to do so may lead to the amp running  
into the wrong impedance, which will  
ultimately cause damage.  
11) Speaker Output  
For connection to an external 16 Ohm  
speaker (The Marshall JCM C12 1x12” and  
JCM C212 2x12” cabinet are designed for  
use with JCM 600 combos).  
On the JCM 600 head this output could drive  
a second JCM C410A or JCM C410B  
cabinet.  
3
2
1
3
2
1
3
2
1
3
2
1
XLR Channel Input  
On Mixer  
(Note: Line Level-  
Approx OdBV)  
A
2 Core Screened Balanced Mic Lead  
NC  
3
3
2
1
2
1
B
C
Unbalanced XLR to Jack Screened Lead  
Jack Plug  
Line Level Jack Input On Mixer Etc.  
3
3
NC  
2
1
2
1
Unbalanced XLR to Jack Screened Lead  
Jack Plug  
Low Level Jack Input On Mixer (ie  
Mic Input)  
J CM 600 XLR Out diagram  
 
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J CM6 0 0 He a d & J CM6 0 1 Co m b o Fro n t P a n e l  
STANDBY  
POWER  
VALVE GUI TAR AMPLI FI ER  
OVERDRIVE  
MASTER  
JCM600  
0
0
FOOT  
INPUT  
4
6
4
6
4
6
4
6
8
12  
20  
4
6
4
6
4
6
4
6
4
6
4
6
4
6
4
6
SWITCH  
2
4
RED  
8
8
PUSH  
0
10  
0
10  
0
10  
0
10  
0
0
10  
0
10  
0
10  
0
10  
0
10  
0
10  
0
10  
0
10  
CHANNEL  
GREEN  
1
1
(Parallel Mix)  
CLEAN  
REVERB  
OVERDRIVE  
REVERB  
CLEAN  
VOLUME  
BASS  
MIDDLE  
TREBLE  
GAIN  
VOLUME  
BASS  
MIDDLE  
TREBLE  
EFFECTS  
VOLUME  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
J CM6 0 2 Co m b o Fro n t P a n e l  
STANDBY  
POWER  
VALVE GUI TAR AMPLI FI ER  
OVERDRIVE  
MASTER  
JCM600  
0
0
FOOT  
SWITCH  
INPUT  
4
6
4
6
4
6
4
6
8
12  
4
6
4
6
4
6
4
6
4
6
4
6
4
6
4
6
2
4
8
8
PUSH  
RED  
0
10  
0
10  
0
10  
0
0
20  
0
10  
0
10  
0
10  
0
10  
0
10  
0
10  
0
10  
0
10  
10  
CHANNEL  
GREEN  
1
1
(Parallel Mix)  
CLEAN  
REVERB  
OVERDRIVE  
REVERB  
CLEAN  
VOLUME  
BASS  
MIDDLE  
TREBLE  
GAIN  
VOLUME  
BASS  
MIDDLE  
TREBLE  
EFFECTS  
VOLUME  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
 
J CM6 0 1 & 6 0 2 Co m b o Re a r P a n e l  
Presence  
MAIN S FUSE  
MAIN S IN PUT  
PARALELL  
FX LO O P  
SERIES  
FX LO O P  
D.I.O UTPUT  
60 watts RMS into 8/ 16  
.
CAUTION!: TO REDUCE THE RISK OF FIRE REPLACE FUSES WITH THE  
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.  
Pin 1—OV, Pin 2—High, Pin 3—Low  
120VT3A  
SAME TYPE AND RATING ONLY. DISCONECT SUPPLY CORD BEFORE  
O UTPUT  
230VT1.6A  
4
6
Emulated  
CHANGING FUSE. TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT  
REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING  
TO QUALIFIED SERVICE PERSONNEL.  
Return  
Send  
Return  
Send  
Internal  
Extension  
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.  
PWR Amp  
Line Out  
2
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ATTENTION!: POUR EVITER LES RISQUES D’INCENDIE UTILISER UN  
FUSIBLE DE MEME TYPE ET DE MEME CALIBRE. DEBRANCHER AVANT DE  
REMPLACER LE FUSIBLE. POUR EVITER LES RISQUES DE DECHARGES  
ELECTRIQUES, NE PAS OUVRIR LE COUVERCLE. CET APPAREIL NE COMPORTE  
AUCUNE PIECE SUSCEPTIBLE D’ETRE REPAREE PAR  
CONNECTER CET APPAREIL A LA TERRE.  
0
10  
120V ~ 60 Hz 225 Watts  
Made in England by:  
Marshall Amplification plc,  
Bletchley, Milton Keynes, England.  
VOS SOINS. FAITES TOUJOURS APPEL A UN TECHNICIEN QUALIFIE  
POUR TOUTE REPARATION.  
1
2
3
4
5
6
7
8
9
10  
11  
J CM6 0 0 He a d Re a r P a n e l  
D.I.O UTPUT  
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.  
CAUTION!: TO REDUCE THE RISK OF FIRE REPLACE FUSES WITH THE  
SAME TYPE AND RATING ONLY. DISCONECT SUPPLY CORD BEFORE  
CHANGING FUSE.TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT  
REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING  
TO QUALIFIED SERVICE PERSONNEL.  
MAIN S FUSE  
120V - T3A  
230V - T1.6A  
MAIN S IN PUT  
Presence  
PARALLEL  
FX LO O P  
SERIES  
FX LO O P  
60 watts RMS into 8/ 16  
.
Pin  
1
-
OV, Pin  
2
-
High, Pin  
3
-
Low  
Emulated  
O UTPUT  
4
6
Return  
Send  
Return  
Send  
Main  
16  
Ext 16  
Main 8  
PWR Amp  
Line Out  
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.  
2
8
ATTENTION!: POUR EVITER LES RISQUES D’INCENDIE UTILISER UN  
FUSIBLE DE MEME TYPE ET DE MEME CALIBRE. DEBRANCHER AVANT DE  
REMPLACER LE FUSIBLE.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.  
CONNECTER CET APPAREIL A LA TERRE.  
0
10  
120V ~ 60 Hz 225 Watts  
Made in England by:  
Marshall Amplification plc,  
Bletchley, Milton Keynes, England.  
Refer to manual Se referer au manuel  
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