Marshall Amplification JCM 2000 DSL50 User manual

JCM 2000
DSL50 &DSL100
Heads
Handbook
1
Marshall Amplification plc
Denbigh Road, Bletchley, Milton Keynes, MK1 1DQ, England
Tel: [phone]
Fax: [phone]
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.
Nov ‘98

WARNING !
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 !
The Marshall 1959 Super Lead Plexi head and the JCM 800 Master Volume 2203 are
recognised the world over as benchmarks in tone, feel, musical power and sheer size of sound.
Imagine then, an amp which is like two footswitchable 1959 Super Leads in one, with the
addition of reverb plus extra gain to take you into 2203 territory and beyond. If this sounds like
a dream, it is no longer - now that the JCM 2000 Dual Super Lead range is here.
The 100 Watt DSL 100 and 50 Watt DSL 50 Dual Super Lead heads feature two
footswitchable channels, Classic Gain / Channel A and Ultra Gain / Channel B. As the names
imply, each channel has a very different character, with Classic Gain / Channel A taking you
from a clean to crunch 1959 and then, via a mode switch, up to a 2203 style brute. Ultra Gain /
Channel B takes you from a hot rodded 2203, via a mode switch, to a higher gain response with
the addition of mid-boost. Each channel also has its own individual Reverb level.
The amps also feature a Deep Switch and Tone Shift which are common to both channels.
The Deep Switch adds a resonant bass boost to your sound without muddying it up, while the
Tone Shift selector shifts out the mid frequencies making the amp ideal for brutal metal tones,
especially when combined with high gain settings.
Their all round versatility and sheer size of sound make the DSL 100 and DSL 50 superb
performance tools for today’s most demanding playing situations and you can rest assured they
are packed full of the famed Marshall TONE.
Please read this handbook carefully before plugging in.
2
JCM 2000 Introduction
TREBLE MIDDLE
EQUALISATION
BASS CHANNEL B CHANNEL A GAIN CHANNEL VOLUME
CLEAN
CRUNCH
POWER STANDBY GAIN
INPUT
REVERB ULTRA GAIN
/ CHANNEL B CLASSIC GAIN / CHANNEL A
TONE SHIFT
LEAD 1
LEAD 2
DEEP
PRESENCE
OFF
ON
OFF
ON
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VOLUME
DSL 100
DUAL SUPER LEAD
JCM 2000
1 2 3456 7 9
10 11 13 15 17 19 20
812 14 16 18

3
DSL 100 & DSL 50
Front Panel functions
1. Power Switch
On / Off Switch for mains power to the amplifier.
2. Standby Switch
Controls H.T. or high voltage to the valves to
allow them to attain correct working temperature
before playing. To prolong the life of the valves it is
always advisable to switch on the Mains Power
Switch (item 1) about 2 minutes before switching on
the Standby (item 2).
On switching off, the Standby should always be
switched before the Power Switch.
The standby facility is particularly useful live
between sets and before playing, as it allows you to
keep the valves operating at a functional temperature
but without any sound being produced.
3. Deep Switch
The Deep Switch adds a tuned or resonant bass
boost to your sound, increasing bottom end thud,
without making your tone woolly around the all
important low end.
4. Presence Control
Adds higher frequencies to the guitar tone, creating
crispness and bite. Turning this up will make the
sound more cutting and in your face.
5. Treble Control
Controls the high frequencies of the guitar tone,
making your guitar sound brighter when increased.
6. Middle Control
Dictates the middle register of the amplifier.
Turning this up will make your guitar sound fatter.
Conversely reducing the amount of middle in your
tone will result in a sharper and thinner guitar sound
for the classic “scooped” tone.
7. Bass Control
Controls the amount of low frequencies or bottom
end in your tone.
8. Tone Shift
The Tone Shift Switch reconfigures the tone
network components to give a new dimension to
passive tone shaping. With the switch selected to the
“in” position and the Middle Control (item 6) turned
down the result is a scooped mid sound ideal for
certain classic metal styles.
Reverb
9. Channel B
Controls the reverb level on Channel B.
10. Channel A
Controls the reverb level on Channel A.
Ultra Gain / Channel B
11. Volume
Governs the volume level of Channel B.
12. Lead 1 / Lead 2 Switch
The DSL 100 and DSL 50‘s Channel B features
two modes. The first, Lead 1, gives an open high
gain crunch, with traditional Marshall characteristics,
similar to a hot-rodded JCM 800 2203 master
volume. The Lead 2 mode however gives a mid-
boosted tone coupled with even higher gain
possibilities.
13. Gain
Controls the gain level for Channel B. As the
amount of gain increases so will the distortion level in
your sound.
14. LED
Indicates when Channel B has been selected.
15. Channel Switch
Selects Channel A or Channel B.
16. LED
Indicates when Channel A has been selected.
Classic Gain / Channel A
17. Volume
Governs the volume level of Channel A
18. Clean / Crunch
As with Channel B, Channel A features two
modes. The first, Clean, is reminiscent of an early
1959 Plexi Super Lead head. Depending on Gain
settings (item .19) this mode will take you from clean
to a controlled Plexi style crunch. Crunch will take
you up to a JCM 800 2203 style grind.
19. Gain
Controls the gain level for Channel A. As the
amount of gain increases so will the distortion level in
your tone.
20. Input
Jack input for guitar.

4
DSL 100 & DSL 50 Rear Panel functions
Footswitch
1. Channel
By connecting the supplied PED801 footswitch to
this jack it is possible to footswitch between Channel
A and Channel B. The footswitch will override the
front panel Channel switch position (item 15).
2. Reverb Footswitch
By connecting another PED801 footswitch
(optional) to this jack it is possible to remotely switch
reverb on and off.
Effects Loop
3. Send
For connection to the input of an external effects
processor.
4. Return
For connection from the output of an external
effects processor.
5. Loop Level
The loop level on the DSL 100 and DSL 50 can be
adjusted to match either floor pedals, requiring a low
level or effects processors which require a high level.
Loudspeaker Outputs
With all valve amplifiers it is imperative that the
amp is connected to a load whilst in operation and
that the impedance selected on the amp matches the
total impedance of the speaker cabinet(s) being used.
For example, if the amp is running into a single 16
Ohm cab, the amp should accordingly be set to 16
Ohms. If running into two 16 Ohm cabs, the amp
should be set to 8 Ohms. If running into two 8 Ohm
cabs the amp should be set to 4 Ohms.
Failure to comply with these points will result in
damage to the amplifier.
The DSL 100 and DSL 50 feature three outputs, a
dedicated 16 Ohm output and two outputs selectable
between 4 and 8 Ohms.
The DSL 100 and DSL 50 should be run into a
minimum impedance of 4 Ohms.
6. 16 Ohm Output
For the connection of a 16 Ohm speaker cabinet.
It should be noted that when this Speaker Output is in
use the remaining Speaker Outputs, items 7 and 8,
will become inoperational.
7. & 8. 4 & 8 Ohm Outputs
For use when the total impedance of speaker
cabinets used is either 4 or 8 Ohms. That is, when
using either a single 4 Ohm cab, a single 8 Ohm, two
8 Ohm cabs or two 16 Ohm cabs.
9. Impedance Selector
Allows selection of 4 or 8 Ohms impedance for
items 7 & 8.
See Loading Points.
10. Mains fuse
See rear panel for correct value.
11. Mains Input
For connection to mains supply.
12. H.T. fuse
See rear panel for correct value.
Loading Points
One 4 Ohm cabinet, set to 4 Ohms
One 8 Ohm cabinet, set to 8 Ohms
Two 8 Ohm cabinets, set to 4 Ohms
Two 16 Ohm cabinets, set to 8 Ohms
N.B. Always ensure that proper speaker leads are
used to connect speakers to the DSL 100 and DSL 50,
not guitar leads!
WARNING !
If loudspeaker is disconnected a high voltage can
be present at these output terminals. Operation in
this manner can damage your amplifier, therefore
ensure that loudspeaker is properly connected.
WARNING : RISK OF HAZARDOUS ENERGY!
AVIS : ENERGIE ELECTRIQUE DANGEREUSE!
EFFECTS LOOP LOUDSPEAKER OUTPUTS
FOOTSWITCH
CHANNEL REVERB
100 Watts RMS
4 Ohm / 8 Ohm
16 Ohm ONLY HT
FUSE
(T1A)
MAINS
FUSE
(T2A - 230V)
(T4A - 120V)
SELECT
Made in England by:
Marshall Amplification plc,
Bletchley, Milton Keynes,
England.
MAINS INPUT
120V ~ 60 Hz
375 Watts
RETURN
SEND LOOP
LEVEL
CAUTION!:
TO REDUCE THE RISK OF FIRE REPLACE FUSES WITH THE SAME TYPE
AND RATING ONLY. DISCONNECT 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.
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.
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.
(4 & 8 Ohm PARALLEL JACKS)
Note: 16 Ohm Output Jack negates use of others.
REFER TO MANUAL FOR FULL DETAILS. SE REFERER AU MANUEL POUR PLUS DE DETAILS.
WARNING!:RISK OF HAZARDOUS ENERGY!
AVIS!:ENERGIE ELECTRIQUE DANGEREUSE!
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