Marshall JCM 900 manual

Marshall JCM 900
6.8 · 3
PDF manual
 · 4 pages
English
manualMarshall JCM 900

WARNING! - Important safety instructions

WARNING: This apparatus must be earthed!
A PLEASE read this instruction manual carefully before switching on.
B ALWAYS use the supplied mains lead, if a replacement is required please contact your
authorised Marshall Dealer.
C NEVER attempt to by-pass the fuses or fit ones of the incorrect value.
D DO NOT attempt to remove the amplifier chassis, there are no user serviceable parts.
E Refer all servicing to qualified service personnel including replacement of fuses and
valves. Servicing is required when the apparatus has been damaged in any way, such as
when the power supply cord or plug is damaged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally or has been dropped.
F NEVER use an amplifier in damp or wet conditions.
G ALWAYS unplug this apparatus during lightning storms or when unused for long periods of
time.
H PROTECT the power cord from being walked on or pinched particularly at plugs,
convenience receptacles and at the point where they exit from the apparatus.
I DO NOT switch the amplifier on without the loudspeaker connected.
Note: This equipment has been tested and found to comply with the requirements of the EMC
directive (Environments E1, E2 and E3) and the Low Voltage directive in the E.U.
EUROPE ONLY - Note: The Peak Inrush current for the JCM900 4100 is 40 amps.
CAUTION: Any changes or modifications not expressly approved by the party responsible for
compliance may void the users authority to operate the equipment.
Note: It is recomended that all audio cables used to connect to the JCM900 4100 are of a high
quality screened type.These should not exceed 10 metres in length.
WARNING: Do not obstruct ventilation grille and always ensure free movement of air around the
amplifier!
USA ONLY - DO NOT defeat the purpose of the polarised or grounding type plug. A
polarised plug has two blades with one wider than the other. A grounding type plug has two
blades and a third grounding prong.The wide blade or the third prong are provided for your safety.
When the provided plug does not fit into your outlet, consult an electrician for replacement of the
obsolete outlet.
Follow all instructions and heed all warnings
KEEP THESE INSTRUCTIONS !
!

From the Chairman

I would like to thank you personally for selecting
one of our Marshall JCM 900 valve amplifiers. For
over three decades my company has been
dedicated to the design and manufacture of the
finest amplification systems in the world.
By ‘listening’ to guitarists from all over the world
we know that their needs are constantly changing,
demanding more from their amplification.
The only way to cope with these new demands is
to invest into the research & development of new
models capable of fulfilling their ever more extreme
requirements.This investment has led to
remarkable innovation within our product ranges
over the years.
In all the JCM 900 models there are degrees of
innovation to give extra high gain, wider tone
control and greater connection flexibility to provide
you with the widest possible sound variations.
In addition the incorporation of new circuitry and
the unique ‘output valve protection circuit’ has
increased the renowned Marshall reliability even
further.
I wish you great success with your new amplifier.
1 2
ENGLISH ENGLISH

Manual

View the manual for the Marshall JCM 900 here, for free. This manual comes under the category guitar amplifiers and has been rated by 3 people with an average of a 6.8. This manual is available in the following languages: English. Do you have a question about the Marshall JCM 900 or do you need help? Ask your question here

Need help?

Do you have a question about the Marshall and is the answer not in the manual?

  • Receive updates on solutions
  • Get answers to your question

Question and answer

Number of questions: 2
P
paul chumleyAugust 16, 2023

I have aJCM900 4501 combo. Speaker Celestion G12T75. What is the impedance of the speaker, please? Which setting do I switch the impedance (i.e. 8 or 4(16).

G
GregNovember 11, 2023

what order do mixed matched power tube amps go in

Marshall JCM 900 specifications

Below you will find the product specifications and the manual specifications of the Marshall JCM 900.

The Marshall JCM 900 guitar amplifier is a highly regarded amplifier known for its powerful and versatile performance. It is designed to deliver a rich and dynamic sound that suits a wide range of musical styles. The JCM 900 features a solid construction, ensuring durability and longevity. It is built with high-quality materials that contribute to its reliability and robustness. Equipped with a range of controls, this amplifier allows musicians to customize their sound to their liking. It offers various tone-shaping options including gain, bass, middle, treble, and presence controls. These controls enable precise adjustment of the amplifier's sound characteristics, allowing musicians to achieve the desired tone. The JCM 900 produces a significant amount of power, making it suitable for both small studio sessions and larger live performances. It is equipped with multiple input and output options, providing flexibility for connecting to external devices such as effects pedals or recording equipment. The amplifier's design is simple and straightforward, making it easy to operate. It offers a reliable and consistent performance, allowing musicians to focus on their music without worrying about technical issues. Overall, the Marshall JCM 900 guitar amplifier is a highly capable and reliable amplifier that delivers excellent sound quality. It is a popular choice among musicians looking for a versatile and powerful amplifier to enhance their performances.

General
BrandMarshall
ModelJCM 900
Productguitar amplifier
LanguageEnglish
FiletypeUser manual (PDF)

Frequently Asked Questions

Can't find the answer to your question in the manual? You may find the answer to your question in the FAQs about the Marshall JCM 900 below.

Why is my Marshall JCM 900 not producing any sound?

Make sure the power switch is turned on, verify that all cables are securely plugged in, and check that the volume and gain knobs are properly adjusted.

How can I achieve a higher volume level from my amp?

Increase the master volume control, while also adjusting the individual channel's volume knobs to find the desired balance.

What should I do if my guitar tone sounds distorted or muddy?

Try reducing the gain or overdrive settings, adjust the equalizer settings to enhance clarity, and ensure proper speaker impedance matching.

What is the purpose of the effects loop on the amp and how do I use it?

The effects loop allows you to connect external pedals or rack-mounted effects. Simply connect the send and return jacks correctly, making sure the effects are active and properly adjusted.

How can I safely switch between different speaker outputs on my amplifier?

Ensure the amplifier is powered off before connecting or disconnecting speakers. Make sure the impedance selector is properly set for the speakers used and avoid using a lower impedance than recommended.

Is the manual of the Marshall JCM 900 available in English?

Yes, the manual of the Marshall JCM 900 is available in English .

Is your question not listed? Ask your question here

No results