Marshall Amplification JTM series User manual

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JTM
Valve Combos & JTM 600
Valve Head.

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1
From the Chairman
I would like to thank you personally for selecting
one of our JTM valve amplifiers.
For over thirty three years now my Company has
been recognised around the world as one of the
leading manufacturers of quality amplification. This
is a direct result of our continual investment in not
only research and development, but also people,
expertise and new production techniques to enable
us to design and manufacture consistently innovative
products, all of which are built to stand the rigours
of time.
Having been a musician myself for over fifty
years, I know that these things are important to all
musicians, but I also know that a major
consideration to any musician is the cost of
equipment. To this end I have made a conscious
effort to employ new techniques to keep the
production costs of the JTM range at as reasonable a
level as possible, without sacrificing any of the
Marshall trademarks such as tone and quality, with
which we would never compromise.
I would suggest that you read this handbook
carefully before operating your new JTM amplifier
and would like to wish you every success with your
new Marshall, which I am sure you will find a
pleasure to play for many years to come.
Yours sincerely,

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. DO NOT obstruct airflow around the amplifier.
J. PLEASE read this instruction manual carefully before switching on.
WARNING : This apparatus must be earthed!
JTM Range 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 series carry
on this grand tradition but meet the demands of contemporary guitarists by
providing features such as channel switching, reverb, effects loop and speaker
emulated output.
Using Your JTM Amplifier
Your JTM Valve combo 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 modern high gain crush. What’s more the
controls are simple and intuitive to use giving you instant access to memorable
Marshall tones.
Whilst one should always bear in mind that taste in tone is a very subjective
matter, the following suggestions will give you a good starting point for getting
some great sounds from your JTM amplifier.
Clean
Make sure you select the Normal 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 volume on this channel before overdrive sets in.
Generally speaking the volume 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
pickups will require extra bass and middle to give the sound more body, but
humbuckers may well require less middle and extra treble to cut through.
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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 Normal 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. The selection of tone settings for
single coil or humbucking pickups will follow the same general pattern as for the
clean sound.
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 particularly to maintain the definition when using humbucking
pickups.
The best advice we could really offer is to simply experiment and above all enjoy
the pure valve tone of your Marshall JTM amplifier.
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 or bottom
end in the overall tone.
9) Middle Control
Controls the middle frequencies and fatness of
the overall tone.
10) Treble Control
Controls the upper or treble frequencies in your
tone.
Please Note
The Tone Controls are interactive and adjusting
one can affect 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.
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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
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.
JTM 30 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 Note
Please refer to the JTM XLR Out diagram
(Page 6) 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 16 Ohm
speaker only (such as the Marshall JTM C112
1x 12” extension cabinet).
Please 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.
JTM 610, 612, 615,
622 and JTM 600 Head
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) Bass Control
Controls the lower frequencies or bottom end
in the tone of the Normal channel.
6) Middle Control
Controls the middle frequencies and fatness
of the tone of the Normal channel.
7) Treble Control
Controls the upper or treble frequencies in the
tone of the Normal channel.
8) L.E.D.
Indicates channel. Green-Normal Red-Boost.
9) Gain Control
Controls the amount of Gain on the Boost
channel.
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10) Volume Control
Controls the volume of the Boost channel.
11) Bass Control
Controls the low end frequencies in the tone
of the Boost channel.
12) Middle Control
Controls the middle frequencies in the tone
of the Boost channel.
13) Treble Control
Controls the upper or treble frequencies in
the tone of the Boost channel.
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.
14) Parallel Effects Mix Control
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 JTM 60 rear panel
functions).
15) Normal Reverb
Controls the amount of Reverb on the
Normal channel.
16) Boost Reverb
Controls the amount of Reverb on the Boost
channel.
17) Volume
Controls the overall volume of the combo.
18) Standby Switch
Controls the H.T. supply to the valves and
allows the valves to remain heated when not
in use.
19) Power Switch
On / Off Switch for mains power to the
amplifier.
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).
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.
JTM 610, 612, 615,
622 and JTM 600 Head
Rear Panel Functions.
1) Mains Fuse
Protects the amplifier and mains supply in
the event of a fault.
Check the label on the back of the amp for
the correct value. Always replace fuses with
the correct type and rating. It is a wise
precaution to always carry spares.
2) Mains Input
Connects the amplifier to the mains power
supply.
3) Parallel FX Loop Return Jack
Jack socket for connection from the output of
an external effects processor.
Please Note
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.
4) Parallel FX Loop Send Jack
Jack socket for connection to the input of an
external effects processor.
5) Series FX Loop Return Jack
Jack socket for connection to the output of an
external effects processor.
6) Series FX Loop Send Jack
Jack socket for connection to the input of an
external effects processor.
Note: The Series Loop is best suited to
effects that require no dry signal such as
Compressors or Graphic Equalisers.
7) D.I. Output
The JTM60’s D.I. Out is switchable between
a speaker Emulated signal (pre the power
amp), and a non Emulated (post the power
amp ) signal.
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 JTM 60’s output to be turned off whilst
still providing silent recording facilities.

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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.
Please Note
Refer to the JTM XLR Out diagrams
(Below) for correct connections.
8) Pre/Post Switch
Allows Line Out selection between a speaker
Emulated signal (pre the power amp) and
non-emulated (post the power amp).
9) Presence Control
This Master Presence control adjusts the
amount of top end frequencies in the overall
tone - adding crispness and bite.
10) Speaker Output
On combo formats of the JTM 60 this jack is for
connection to the internal 16 Ohm speaker. On
the JTM 600 Head this socket is for connection
to an external speaker cabinet, such as the
purpose built JTM C410 compact 4x10” cabinet.
11) Speaker Output
For connection to an external 16 Ohm
speaker (The Marshall JTM C12 1x12” and
JTM C212 2x12” cabinet are designed for use
with JTM 60 combos).
On the JTM 600 head this output could drive
a second JTM C40 cabinet.
Note
The JTM 60 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.
If you unplug the internal loudspeaker in a
JTM 60 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.
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JTM XLR Out diagram
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
A
B
C
XLR Channel Input
On Mixer
(Note: Line Level-
Approx OdBV)
2 Core Screened Balanced Mic Lead
Unbalanced XLR to Jack Screened Lead
Unbalanced XLR to Jack Screened Lead
Jack Plug Line Level Jack Input On Mixer Etc.
Jack Plug
NC
NC
Low Level Jack Input On Mixer (ie
Mic Input)
✪

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
0
1
POWER
0
1
FOOT
SWITCH TONE
BASS MIDDLE TREBLE SEND RETURN REVERB VOLUME
LOOP MASTER
VOLUME
INPUT
0
2 8
6
4
10 0
2 8
6
4
10 0
2 8
6
4
10 0
2 8
6
4
10 0
2 8
6
4
10 0
2 8
6
4
10
PUSH
CHANNEL
RED
GREEN
0
28
6
4
10 0
2 8
6
4
10
GAIN
NORMAL
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JTM 30 Front Panel
JTM 30 Rear Panel
1 2 4 6 5 7 9 11 12 13 14 15 16 8
34 5
1 2
3
MAINS INPUT 230V ~ 50 Hz 160 Watts
MAINS FUSE
120V—T3A
230V—T1.6A
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.
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.
Manufactured in Great Britain by:
Marshall Amplification plc, Bletchley, Milton
Keynes, England.
60 watts RMS into 8/16 .
16 extension speaker
16 internal speaker
(Refer to manual for details)
PARALELL
FX LOOP SERIES FX LOOP
Return ReturnSend Send
D.I.OUTPUT
Pin 1—OV, Pin 2—High, Pin 3—Low (Refer to manual)
0
8
4
10
Presence
2
Emulated
PWR Amp
Line Out
6
OUTPUT
Internal Extension
60
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VOLUME BASS MIDDLE TREBLE NORMAL
REVERB BOOST REVERB VOLUME
BOOST MASTER
0
—
6
4
10 0
—
6
4
10 0
—
6
4
10 0
—
6
4
10 0
—
6
4
10 0
—
6
4
10 0
—
6
4
10 0
—8
6
4
10
STANDBY
0
1
POWER
0
1
GAINVOLUME
NORMAL BASS MIDDLE TREBLE
0
2
6
4
10 0
—
6
4
10 0
—
6
4
10
PUSH
CHANNEL
FOOT
SWITCH INPUT
RED
GREEN
0
4
12
8
200
—8
6
4
10
(Parallel Mix)
EFFECTS
JTM 60 Front Panel
JTM 60 Rear Panel
1 2 4 6 5 7 9 10 11 12 13 14 15 16 17 18 19 8
1 2
3
345678 9 10 11
10