ORANGE 4 JIM ROOT User manual

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THANK YOU!
Thank you for choosing Orange. You are now a member of the
‘Legendary British Guitar Amplifier’ owners club!
Since 1968 when the company was founded, Orange has been a
pioneering force in the guitar amplification industry. Today, with
a team of the world’s finest amplifier engineers, Orange
continues to push back the boundaries of conventional tube
amplifier design.
Our commitment to craftsmanship and quality control has
allowed our amplifiers to stand the test of time, giving their owners as much pleasure now, as the day
they were bought. To maintain this level of excellence, each Orange amplifier is put through many
rigorous test procedures before leaving the factory.
The warmth, tonal quality and rich harmonics generated by a valve ampli fier cannot be reproduced by
‘artificial’ means. Many guitarists have reached the same conclusion: neither the transistor nor
microchip is a suitable alternative to valve technology.
This booklet contains valuable technical and safety information Please t ake the time to read this manual
as the information may enhance the sound and performance of your amplifier. We are confident that
you will be delighted with your new purchase and that it will provide you with many years of enjoyment.

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CONTENTS
CONTENTS............................................................................................................................................... 3
CONTACT DETAILS...................................................................................................................................4
IMPORTANT SAFETY INFORMATION.......................................................................................................5
USING YOUR AMPLIFIER ......................................................................................................................... 8
VALVES AND FUSES CAN FAIL AT ANY TIME! ........................................................................................11
FREE EXTENDED WARRANTY OFFER ..................................................................................................... 11

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CONTACT DETAILS
Orange Amplifiers
OMEC House
108 Ripon Way
Borehamwood
Hertfordshire
WD6 2JA
ENGLAND
Tel: [phone]
Fax: [phone]
[email protected]
Orange USA
2065 Peachtree Industrial Ct.
Suite 208
Atlanta, GA 30341
USA
Tel: [phone]
Fax: [phone]
[e-mail]

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IMPORTANT SAFETY INFORMATION
The lightning flash with arrowhead symbol, within an equilateral triangle, is
intended to alert the user to the presence of un-insulated ‘dangerous voltage’
within the product’s enclosure that may be of sufficient magnitude to constitute a
risk of electric shock to persons. Terminals labelled as
“Speaker Outputs” must be connected to a speaker cabinet of the designated
load rating using an un-shielded two conductor cable for speaker use at all times
during operation
The exclamation point within an equilateral triangle and "WARNING" are
intended to alert the user to the presence of important operating instructions.
Failure to heed the instructions will result in severe injury or death.
• Keep these instructions.
• Heed all warnings.
• Follow all instructions.
• Do not use this apparatus near liquid.
• Clean only with dry cloth.

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• Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
• Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
• Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has
two blades, one wider than the other. A grounding type plug has two blades and a third grounding
prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit
into your outlet, consult an electrician for replacement of the obsolete outlet.
• Servicing: Do not attempt to service this product yourself as opening or removing covers may
expose you to dangerous voltage or other hazards.
• Refer all servicing to qualified service personnel.
• Damage Requiring Service: Unplug this product from the wall outlet and refer servicing to
qualified service personnel under the following conditions: (a) When the power-supply cord or plug
is damaged; (b) If liquid has been spilled, or objects have fallen into the product; (c) If the product
has been exposed to rain or water; (d) If the product does not operate normally by following the
operating instructions. Adjust only those controls that are covered by the operating instructions.
Improper adjustment of other controls may result in damage and will often require extensive work
by a qualified technician to restore the product to its normal operation; (e) if the product has been
dropped or damaged in any way; (f) when the product exhibits a distinct change in performance -
this indicates a need for service.
• Replacement Parts: When replacement parts are required, be sure the service technician has
used replacement parts specified by the manufacturer or have the same characteristics as the
original part. Unauthorized substitutions may result in fire, electric shock, or other hazards.

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This Orange Amplifier conforms to UL Standard 60065 for Audio, Video and Similar Electronic
Apparatus - Safety Requirements;
Certified to CAN/CSA-C22.2 No. 60065-03; IEC 60065 2001 + A1:2005
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.

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USING YOUR AMPLIFIER
Connect the amplifier to a speaker cabinet of the correct impedance.
Connect 1 x 16ohm cabinet to the 16ohm speaker output jack socket.
Connect 1 x 8ohm cabinet to either of the 8ohm speaker output jack socket.
Connect 2 x 16ohm cabinets to both of the 8ohm speaker output jack sockets.
1. Connect the amplifier to a mains supply of the correct voltage as marked on the amplifier.
Make sure that the HALF/STBY/FULL output switch is in the Standby (middle) position before
switching the power switch to the ON position.
IMPORTANT!
For countries or regions with a mains voltage of 115v or 120v, please switch the small, red
mains selector to 115v or 120v and replace the fuse in the black pull out fuse tray, below the
mains inlet, with the 120v version supplied.
For countries or regions with a mains voltage of 230v, please switch the small, red mains
selector to 230v and replace the fuse in the black pull out fuse tray, below the mains inlet,
with the 230v version supplied.

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3. GAIN CONTROL.
The gain control adjusts the gain. High levels of gain will heavily overdrive the pre-amp and may
sometimes be uncontrollable, especially when used at high volume levels!
4. BASS CONTROL
The Bass control adjusts the level of bass after the pre-amp stages and before the FX Loop.
5. MIDDLE CONTROL
The Middle control adjusts the level of midrange after the pre-amp stages and before the FX
Loop.
6. TREBLE CONTROL
The Treble control adjusts the level of treble after the pre-amp stages and before the FX Loop.
7. VOLUME CONTROL.
The volume control adjusts the output volume.
High levels of volume will heavily overdrive the output stage.
8. OUTPUT SWITCH. (HALF/STBY/FULL)
The output switch (found next to the power switch on front of amplifier) runs the valves at a low
plate voltage (reducing output power) in the HALF position and at a higher plate voltage
(increasing output power) in the FULL position.
The middle position is the standby position.
This switch should be in the standby position for around two minutes after first powering up the
amplifier!

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9. EFFECTS LOOP SEND AND RETURN JACK SOCKETS.
The effects loop, send and return jack sockets are intended for use with outboard pedals or rack
equipment such as delay, reverb and chorus etc.
Effects such as wah-wah, fuzz, distortion etc, would probably be best placed between the guitar
and amplifier input.
The effects loop is wired in series with the pre-amp signal and is completely valve driven.
10. VALVES.
The #4 Jim Root contains 3 x 12AX7 (ECC83) and 1 x 12AT7 (ECC81) in the pre-amp and effects
loop and 2 x EL84 in the output stage.
11. HT FUSE. (T250MA)
Please contact a qualified service technician if this fuse fails!

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VALVES AND FUSES CAN FAIL AT ANY TIME!
From time to time output and preamp valves may fail. We suggest that output valves are changed at
least once a year and that all class AB models (50 watts and above) will benefit from having the bias
checked and adjusted. Bias checking must be carried out by a qualified engineer.
Orange amps are protected from damage caused by valve failure and inconsistent mains voltage by
various fuses. We recommend that Orange users have a set of spare valves and fuses.
For more information on maintenance and for accessories and spares, please visit
www.orangeamps.com
FREE EXTENDED WARRANTY OFFER
Orange amplifiers are under warranty for one year subject to consumer protection laws in the
country of purchase and distributor’s terms and conditions, an additional year can be added by
registering.
Valves and speakers supplied with an Orange amp or purchased separately at our online store are
covered for 90 days from the date of purchase.
The warranty status of any Orange product is subject to its being used for its intended purpose in
suitable conditions. As the manufacturer we reserve the right to refuse to warranty any Orange
product which has been misused in any way whatsoever.
REGISTER RIGHT NOW AT www.orangeamps.com