Marshall Amplification JTM60 User manual

JTM Series
JTM60
Valve Combo
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.
Jan ‘99

2
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. ALWAYS wire the plug according to the colour code attached to the
mains lead.
C. NEVER under any circumstances operate the amplifier without an
earth.
D. NEVER attempt to by-pass the fuses or fit ones of the incorrect value.
E. NEVER attempt to replace fuses or valves with the amplifier connected
to the mains.
F. DO NOT attempt to remove the amplifier chassis, there are no user
serviceable parts.
G. ALWAYS have this equipment serviced or repaired by competent
qualified personnel.
H. NEVER use an amplifier in damp or wet conditions.
I. DO NOT switch the amplifier on without the loudspeaker connected
and ensure that any extension cabinets used are the correct impedance.
J. DO NOT obstruct airflow around amplifier.
K. PLEASE read this instruction manual carefully before switching on.
B
R
O
W
N
B
L
U
E
G
R
E
E
N
/
Y
E
L
L
O
W
3A
N
E
L
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 range 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. Their all-
valve circuitry is capable of the fullest range of
classic sounds from clean to crunch and high
gain drive, with superb styling and specially
designed ‘Heritage’ loudspeakers giving the
JTM range the Vintage looks to match their
Classic range of tones.
Using the JTM 60
The JTM 60 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.
Whilst one should always bear in mind that
taste in tone is very subjective here follows a
few simple suggestions for getting some great
sounds from your JTM 60.
Clean: Make sure you select the Normal
channel on the JTM 60. This 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 Channel Volume control should
be set below half way for totally clean sounds,
with the Master Volume set higher. The tone
network should be set with all three controls at
5 initially, then adjusted to suit the type of
guitar and sound required.

3
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 Valve overdrive roar.
Alternatively the Clean 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.
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.
The best advice we could really offer is to
simply experiment and above all enjoy the
pure valve tone of your Marshall JTM 60.
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 in the tone of
the Normal channel.
6) Middle Control
Controls the middle frequencies in 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.
10) Volume Control
Controls the Volume of the Boost channel.
11) Bass Control
Controls the lower frequencies in the tone of
Boost channel.
12) Middle Control
Controls the middle frequencies in the tone
of the Boost channel.
13) Treble Control
Governs the high end frequencies in the
Boost channels’ tone.
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 Mix Effects Control
Governs the amount of effected signal in the
overall tone when used in conjunction with
external effects through the parallel loop.
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.
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.

4
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.
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.
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) Line Out
The JTM60’s Line 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.
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 refer to the JTM 60 XLR Out
diagrams (Page 6-7) 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 Internal
Jack for connection to internal 16 Ohm
speaker.
11) Speaker Output Extension Jack
For connection to an external 16 Ohm
speaker (such as the Marshall JTM 112C
1x12″).
Note: The JTM 60 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 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.

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 8/16Ω.
16Ωextension speaker
16Ωinternal 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
V
A
L
V
E
A
M
P
L
I
F
I
C
A
T
I
O
N
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
JTM 60 XLR Out diagram ✪
1 2 4 6 5 7 9 10 11 12 13 14 15 16 17 18 19 8
1 2
3
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)
3 4 5 6 7 8 9 10 11