Marshall Amplification JTM-1H User manual

JTM-1H and JTM-1C
Limited Edition, 50th Anniversary, all-valve 1-Watt Head and Combo
commemorating the 1960s decade of Marshall
OWNER’S MANUAL

1
The JTM-1 is an all-valve, 1-Watt amplifier
designed and voiced to reproduce the sounds
of the Marshalls of the ’60s but, as Jim has just
mentioned, at a controllable “home friendly” volume.
The ’60s Marshalls were famous for their full
sound, where a well rounded bass is balanced by
a bright airy treble. They were also designed for a
wide range of guitar output levels, so were quite
easy to overdrive at high volumes. The JTM-1
has been designed to provide this distinctive
tonal character at the surprisingly loud level of
one Watt.
The simple control layout of Loudness and Tone
enables you to dial in a great sound with the
minimum of fuss. To add further to the “home
friendly” nature of this amp, whenever the full
1-Watt output proves too loud you can hit the Low
Power button on the rear panel to further drop
the volume – enabling you to crank the loudness
control to get the tone you desire.
The dual-triode ECC82 in the
power amp is configured to work
in ‘push pull’, just like the famous
Marshall amps of the period. When combined
with the right level of feedback in the power amp,
this allows for fine control over the dynamics,
allowing you to clean up the sound with the guitar
volume, or a lighter, picking touch, and then
“dig in” for some classic ’60s Marshall growl.
The combo is supplied with a 10" 16ΩCelestion
speaker specially voiced to provide the best
balance between a compact size and a full
sound. Both the combo and the head can drive
an external speaker cabinet of either 16Ω or
8Ωat full power via the corresponding speaker
output jacks on the rear panel. Both amplifiers
are also very happy driving a full 4x12" cabinet
for the ultimate in mini Marshall tone of the ’60s.
Overview
ENGLISH
Follow all instructions and heed all warnings.
KEEP THESE INSTRUCTIONS.
Warning:
Before going any further, make sure that your amplifier is compatible with your electrical supply. If you have any doubt, please seek help from
a qualified technician – your Marshall dealer can help you in this respect.
Mains Input & Fuse:
Your amplifier is provided with either a detachable mains (power) lead which should be connected to the mains input socket on the rear panel
of the amplifier or a fixed mains (power) lead attached to the rear of the amplifier.
The specific mains input voltage rating that your amplifier has been manufactured for is indicated on the rear panel of the amplifier.
The correct value and type of mains fuse for valve amplifiers is specified on the rear panel of the amplifier.
NEVER attempt to bypass the fuse or fit one of the incorrect value or type.
Transporting your equipment:
Please ensure that your amplifier is switched off and unplugged from the mains electricity supply and that all removable cables have been
disconnected from your equipment before attempting to move it.
Important set up information:
1. Make sure that the cabinet(s)/speakers, where appropriate, are connected to the correct impedance LOUDSPEAKER jack(s) on the
rear panel of the amplifier. See the Speaker Output guides in this handbook, if applicable, for specific information regarding impedance
matching. When using an extension cabinet make sure that you are using a proper speaker cable. Never use a screened (shielded) guitar
cable for this purpose.
WARNING! Failure to do any of the above may damage your amplifier.
2. Ensure that the LOUDNESS controls on the front panel are set to zero.
3. For amplifiers provided with a detachable mains (power) lead, connect the supplied mains (power) lead into the MAINS INPUT on the rear
panel first and then into an electrical outlet.
4. Plug your guitar into the INPUT jack socket on the front panel.
5. Turn the front panel MAINS switch on and, if a valve amplifier, wait a couple of minutes before going to point 6.
6. Turn the volumes up to your preferred level and your amp is ready to play.
EUROPE ONLY – Note: This equipment has been tested and found to comply with the requirements of the EMC Directive
(Environments E1, E2, and E3 EN:55103-1/2) and the Low Voltage Directive in the E.U.
EUROPE ONLY – Note: The Peak Inrush current for the JTM-1H and the JTM-1C is 1.5A.
From “the Guv’nor” Jim Marshall
Congratulations on purchasing one of our Limited Edition
series of 1-Watt heads and combos that celebrate Marshall’s
50th Anniversary. Each one is made in England with pride
and commemorates the distinctive tonal character, features
and iconic appearance of a specific decade – ’60s, ’70s, ’80s,
’90s and present day. This one is the first in the series and
represents the sounds of the early Marshalls manufactured in
the company’s first decade of existence, the 1960s...
As you may know, with the help and the designing skills of
Dudley Craven and Ken Bran, the first ever Marshall head was
built in the autumn of 1962. The reason for its creation was to
satisfy the tonal desires of the up-and-coming rock guitarists
at the time. They described to me the exact sound they were
looking for and that was the goal we achieved with that very first
amp – the MK I. During that decade the amp evolved into the
JTM45 Mk II head and also the 1987 Lead version. The 1962
Bluesbreaker 2x12" combo was another of its offspring, born in
the ’60s.
The 1-Watt amp you now own pays homage to both the tone
and look of that all-important first decade and does so at a very
“studio” or “home friendly” volume. The front panel of your amp
is very simple, but extremely effective, and I’m sure that its touch
responsive, easily-overdriven tones will give you countless hours
of playing pleasure.
Welcome to the Marshall family!
Yours Sincerely,
Jim Marshall

2 3
Front panel
IMPORTANT: Read before powering-up
Before powering-up your Marshall JTM-1
amplifier, you must ensure that an appropriate
speaker cabinet is connected to the
corresponding impedance matched loudspeaker
jack on the rear panel. Failure to do so could
result in serious damage being caused to your
amplifier. Always use an unshielded loudspeaker
cable to connect an amplifier to a loudspeaker
cabinet, never use a screened (shielded) guitar
cable. After use, always allow the amp to cool
down before moving.
NOTE: the internal speaker in the JTM-1C is 16Ω
IMPORTANT NOTE:
Please refer to the ‘Warning’ plate on underside
or back of the product.
1. Power Switch
This is the On/Off switch for the mains electric
power to the amplifier.
NOTE: Please ensure the amplifier is switched
off and unplugged from the mains electricity
supply whenever it is moved!
2. Mains Indicator
This amber indicator will light up whenever the
amp is plugged into the mains and the Power
Switch (1) is on.
NOTE: Please allow a minute or so for the amp
to ‘warm-up’ after switching on. This is normal
with valve amplifiers as valves need to reach
their ‘working temperature’ to operate properly.
3.Tone
This control determines the amount of high
frequency (top-end or treble) that is present.
The tone control differs from most other single
tone knobs in that it boosts as well as cuts. to set
the control at 12 o'clock and then cut or boost
according to taste.
4. Loudness
This control sets the overall output volume of the
amplifier. At lower volume levels, the tone is also
a little brighter. As the loudness is increased, the
amplifier will start to overdrive.
Tonal Tip: The bassy nature of the amplifier
means that with many guitars, the sound most
typical of the era is with the Loudness at less
than maximum. In the ’60s it was very common
to use a treble booster or fuzz box to get more
overdrive without losing definition.
5. Input Jack Socket
This is where you plug your guitar into the amp.
You must use a screened (shielded) guitar cable.
Never use an unscreened (unshielded) speaker
cable. The input to any guitar amplifier is a very
sensitive part of the signal path and is very
sensitive to electrical interference, hence the
need for a screened guitar cable. Your screened
cable should be of good quality. If you are in any
doubt regarding this, your Marshall dealer will be
more than happy to help and advise you.
Rear panel
WARNING: Although your JTM-1 amplifier has
two extension speaker outputs, never attempt
to connect cabinets to both extension speaker
outputs simultaneously. Only use one speaker
output at a time.
1. Extension Speaker 8Ω
This is the output that connects to an 8Ω
extension cabinet.
2. Extension Speaker 16Ω
This is the output that connects to a 16Ω
extension cabinet.
3. Low power switch
This switch activates the low power mode. The
amplifier is connected to an internal dummy
load and a reduced level is fed to either internal
speaker (JTM-1 combo) or external load (both
head and combo). This level has been selected
for personal practice.
NOTE: With this button pressed, the amplifier
may be operated without a speaker connected
without causing any damage.
4. Mains Input
Your amplifier is provided with a detachable
mains (power) lead, which is connected here.
The specific mains input voltage rating that your
amplifier has been built for is indicated on the
back panel. Before connecting for the first time,
please ensure that your amplifier is compatible
with your electricity supply. If you have any doubt,
please ask the advice of a qualified technician.
Your Marshall dealer will help you in this respect.
The correct value of mains fuse located in the
small drawer at the bottom of the mains socket is
specified on the rear panel of the amplifier. The
drawer contains a space for a spare fuse.
NEVER attempt to bypass the fuse or fit one of
the incorrect value!
NOTE: It is wise to carry spare fuses at all times.
1 2 34 5
ENGLISH
2
1
3 4
JTM-1H and JTM-1C Technical Specifications
JTM-1H JTM-1C
Power (RMS) 1W 1W
Valves 1 x ECC82 + 2 x ECC83 1 x ECC82 + 2 x ECC83
Dimensions (mm) H, W, D 180 x 380 x 195 360 x 380 x 220
Weight (kgs) 5.2 9.4

20 21
Notes Notes

Denbigh Road, Bletchley, Milton Keynes MK1 1DQ England
Tel : [phone] Fax : [phone]
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.
BOOK-00104-00 / 11 / 11