Audio Note COBRA Instruction Manual

COBRA

OWNER’S INFORMATION

INTEGRATED AMPLIFIER

CONTENTS

IMPORTANT SAFETY INFORMATION ……………………………………….…3

CE DECLARATION OF CONFORMITY……………………………………......... 4

DISPOSAL ………………………………………………………..……………….…4

POWER REQUIREMENTS……………………………………..…….……….……4

INTRODUCTION……………………………………..…………………………….. 5

AUDIO NOTE COBRA……..…………………………………………………….…6

UNPACKING AND INSTALLATION……………………………………………..…6

VALVE INSTALLATION…………………………………………………………..…7

CONNECTION………………………………………………………………………..9

OPERATION………………………………………………………………………...10

TECHNICAL SPECIFICATIONS…………………………………………............12

WARRANTY INFORMATION………………………………………………….…..13

CONTACT INFORMATION………………………………………………………..14

RISK OF SHOCK OR ELECTROCUTION! INTERNAL OPERATING

VOLTAGES ARE LETHAL!

Do not open the chassis, unless specifically instructed to do so in the user

manual.

This unit contains fuses and other safety components in accordance with

BS60065 requirements.

In the event of failure, replacement fuse or safety component must be of

the same part type and value.

SUCH REPLACEMENT MUST ONLY BE CARRIED OUT BY A

QUALIFIED SERVICE TECHNICIAN.

Do not attempt to replace any fuses without first disconnecting the unit from

the mains electricity supply.

This product must be earthed –ensure that the mains supply cable earth /

ground is correctly connected.

This product generates high levels of heat. Adequate ventilation must

be provided. Do not restrict airflow through any ventilation slots or

place the unit on any surface that may restrict airflow.

Valve equipment operates at extremely high temperatures;

KEEP OUT OF THE REACH OF CHILDREN AND ANIMALS.

Do not store or operate this unit in areas of high humidity or in close

proximity to water / moisture.

Do not expose or immerse the unit in liquid of any kind.

OTHER SAFETY PRECAUTIONS: -

Never touch the power cord with wet hands.

Always remove the power cord by grasping the plug, not the cable.

Never expose the unit to excessive heat or magnetism.

Never let an inexperienced person repair or reassemble the unit.

Never put anything, especially metal objects, inside the unit.

Never place excessive weight on the unit.

! IMPORTANT SAFETY INFORMATION!

We declare under our sole responsibility that this product is in conformity

with the following standards or standardized documents:

BS EN 60065 in accordance with the regulations 73/23/EEC, 89/336/EEC

(from 1 January 1997)

CE 94

Peter Qvortrup,

Director

Audio Note (UK) Limited

Viscount House

Star Road, Star Trading Estate

Partridge Green

West Sussex

RH13 8RA

United Kingdom

Tel: +44 (0)1273 830 800

Fax: +44 (0)1273 731 498

DISPOSAL

This product must not be disposed of as normal household waste. To

prevent possible harm to the environment please separate the product

from other waste to ensure that it can be recycled in an environmentally

safe manner. Please contact your retailer or the appropriate local

government office for collection facilities.

POWER REQUIREMENTS

Power requirements for electrical equipment vary depending on your geographical

location. Please ensure that your unit meets the power requirements in your area. The

power requirement for your unit is marked on the serial number plate, located on the

rear panel.

If you are in doubt, please contact your dealer before connecting the unit to the mains

supply.

CE DECLARATION OF CONFORMITY

Thank you for purchasing this Audio Note (UK) product. With the correct care it

should give you many years of pleasure and enjoyment.

Please take the time to read all of the information in this manual before connecting

your new component to an electrical supply or your system, to ensure both your

safety and satisfaction.

Please note that due to our desire to continually improve products, specifications are

subject to change without notice. Therefore it is important to refer to the manual that

is supplied with your product for the most accurate information; manuals downloaded

from our website or obtained from other sources may no longer fully apply to your

product.

If you have any questions regarding the information contained within this document

or your new component, please feel free to contact us: -

Audio Note (UK) Limited

Viscount House

Star Road, Star Trading Estate

Partridge Green

West Sussex

RH13 8RA

United Kingdom

Tel: +44 (0)1273 830 800

Fax: +44 (0)1273 731 498

e-mail: info@audionote.co.uk

INTRODUCTION

Congratulations on your purchase of the Audio Note (UK) COBRA Integrated

Amplifier.

It is a Push Pull, Pure Class A valve design, offering an outstanding level of

performance and value.

It has been specifically engineered for sonic performance rather than technical

specification, and fulfills all Audio Note (UK) Level 1 criteria: -

Pure Class A Push-Pull Pentode operation

Materials and component quality

An input stage consisting of 2 x 6UA6 and 2x 5670 feeds the push-pull configured

EL34 output valves, two of which are used per channel.

The C-core output transformers are custom designed and manufactured by Audio

Note (UK) and are of extremely high quality, offering outstanding, class leading

performance.

The power supply is a multi element design with choke smoothing, ensuring precise

operation of each circuit stage, whilst a separate DC supply feeds the valve

filaments.

Please take care when unpacking your COBRA Integrated Amplifier. Choose a

clean, clear location to unpack your unit. Be aware that the amplifier is very heavy;

before attempting to unpack or lift the unit, check the weight and if necessary use

more than one person,so that it can be moved safely and easily.

We recommend that you retain and carefully store all of the original packing

materials in case transportation / shipping is required at a later date.

Select a suitable location for the unit. This should be a dry, dust free and level area,

preferably shielded from direct sunlight and free from vibration. Also ensure that the

location is stable and capable of carrying the weight of the unit.

A suitable mains power outlet must be close to the location; power cords must not be

pulled or stretched tightly in an attempt to reach a wall socket. If the power cord will

not easily reach the socket, choose a closer location!

Please ensure that adequate ventilation for the unit is provided, and that airflow

through any ventilation slots in the unit is not restricted. We recommend a distance of

at least 30cm free space is maintained above the unit. Please also remember that

valve equipment operates at extremely high temperatures, so a position that is

inaccessible to any children or animals is essential.

AUDIO NOTE COBRA

UNPACKING AND INSTALLATION

The amplifier is shipped without the valvesinstalled. It is necessary to install all

valves before the amplifier can be connected to the mains supply and operated.

It is essential that the valves are installed correctly or serious damage that is

not covered by the warranty will result. We recommend that your dealer

perform this procedure for you if you are in any way unsure.

FIRSTLY, ENSURE THAT THE AMPLIFIER IS NOT CONNECTED TO A

MAINS ELECTRICAL SUPPLY, AND THAT THE POWER CORD IS NOT

CONNECTED TO THE AMPLIFIER.

Carefully unwrap all valves.

For reference, the supplied valves are as follows: -

Socket 1 –EL34

Socket 2 – EL34

Socket 3 – EL34

Socket 4 – EL34

Socket 5 –5670

Socket 6 –5670

Socket 7 –6AU6

Socket 8 –6AU6

Once again, please understand that it is absolutely vital these valves are

fitted correctly.

Look at the drawing of the COBRA on the next page and familiarize yourself with the

positions of the various valves. First install the EL34 valves, which should be

inserted into sockets ‘1’, ‘2’, ‘3’ and ‘4’. Locate the rib on the central pin of the valve

base and align with the valve socket (it can only be inserted one way due to this

locating rib) and with gentle but firm pressure insert the valve.

Next, insert the four small signal valves into the front four sockets.

Looking from the front of the amplifier, insert the shorter 5670 valves into the outer

sockets ‘5’ and ‘6’, and the taller 6AU6 valves into the inner sockets ‘7’ and ‘8’. The

valves can only be inserted one way.

Check once again that all valves are correctly installed.

VALVE INSTALLATION

VALVE 1, 2, 3, 4 - EL34

VALVE 5, 6 - 5670

VALVE 7, 8 - 6AU6

VALVE INSTALLATION Continued…

Line inputs Three line level inputs are available, labeled ‘A1’, ‘A2’ and ‘A3’,

located on the right hand side of the rear panel.

Digital inputs The COBRA is equipped with 3 digital inputs:

‘D1’ – USB B-type, for connection to a source with a USB output

‘D2’ – TOSLINK Optical digital

‘D3’ – Coaxial digital

Ground Post A ground post is provided for connection to those source

components that also use a separate ground terminal.

Speakers Each channel is equipped with 2colour coded binding posts for

connection to your speakers.

Looking from the front of the amplifier, the 2binding posts to the left

are for the left channel and the 2binding posts to the right are for

the right channel.

Connect the amplifier’s black speaker output binding post marked as

“ –“ to the black / negative terminal (also marked “ –“) on the

speaker.

Connect the amplifier’s red speaker output binding post marked “ + “

to the red / positive terminal (also marked “ + “) on the ‘speaker.

Mains in The COBRA is equipped with an IEC 320 mains inlet socket. Use

the supplied mains cable to connect the unit to the local mains

supply. The mains fuse is located in the fuse holder positioned to the

right of the mains inlet socket on the rear panel.

Fuse The mains fuse and a spare are located in the compartment next

to the mains switch on the rear panel.

CONNECTION

Special Note –Make sure that all connections are tight and clean. For best results

use good quality audio interconnects. For best results and performance, we

recommend our own Audio Note (UK) range of interconnects and loudspeaker

cables. For further information, please consult your nearest Audio Note (UK) dealer,

or alternatively please feel free to contact us directly.

Once all connections are completed and checked, ensure that the volume control is

at the minimum setting (rotated all the way to the left).

Turn on any source components (CD player, DAC, Phono stage etc.) BEFORE

turning on the amplifier; the amplifier should be the LAST item to be turned on

when you are ready to listen to your system, and the FIRST item to be turned

off when the listening session is over.

Turn on the amplifier by using the rocker switch located on the top / right of the rear

panel, next to the mains inlet socket.

One of the red front panel lightsshould now be lit. The amplifier requires

approximately two minutes to initialize before it is ready for operation.

Input Selector Turn the input selector knob until the light of the source you

wish to listen to lights up.

Volume Control This control adjusts the listening level, or loudness. Set as

desired!

Inputs, Volume and Mute can be also controlled with the supplied remote control

handset.

When Mute is selected, input light flashes.

OPERATION

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