Orange OV4 Owner`s Manual

OV4 Owners Manual

Orange Amplifiers OMEC House 108 Ripon Way Borehamwood Hertfordshire WD6 2JA ENGLAND Tel: +44 20 8905 2828 Fax: +44 20 8905 2868 Email:

info@omec.com

Orange USA 2065 Peachtree Industrial Ct. Suite 208 Atlanta, GA 30341 USA Tel: 1-404-303-8196 Fax: 1-404-303-7176 Email:

info@orangeusa.com

Contents

Introduction.......................................................................................................................

Amplifier Biasing Background Information........................................................................

Safety................................................................................................................................

DIVO OV4 General Overview...........................................................................................

System Block Diagram and Functions..............................................................................

Panel Features & Functions..............................................................................................

Functionality Quick Reference Guide................................................................................

DIVO OV4 Operation........................................................................................................

Thank You For Choosing Orange.

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 valve amplifier design.

Our commitment to craftsmanship and quality control has allowed our amplification products 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 product is put through many rigorous test procedures before leaving the factory.

The warmth, tonal quality and rich harmonics generated by a valve amplifier 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 take the time to read this manual as the information may enhance the sound and performance of your amplifier.

Amplifier Biasing Background Information

Put simply, bias is your idle adjustment for your valves - it's like making sure your car is ticking over properly. In fixed bias amplifiers, this is achieved by applying a negative voltage to the valves control grid - literally a grid of wire that sits between the cathode and plate. When you switch your amp on, electrons are generated at the cathode and pulled towards the plate, causing current to flow. This happens because electrons are negatively charged particles and the plate is energised with a strong positive voltage opposite poles attract.

Varying the control grid's negative voltage means this flow of electrons can be slowed to a trickle, or even stopped - like poles repel. Although people often refer to the negative bias voltage setting, it's the actual idle current that is important. All valves have an ideal idle current, typically around 30-50 milliamps, and for the amp to operate at its best it's important that all your output valves are idling equally. This is done by fitting valves that have been matched in pairs or quartets. However even the best matching doesn't mean that valves will wear equally, so in order to keep your amp operating at its best, an occasional small adjustment to the bias is sometimes necessary. Usually these adjustments are at best a compromise as individual output valves rarely draw the same idle current.

The Orange DIVO OV4 addresses these issues and takes care of the biasing keeping the most wayward valves on the straight and narrow. It also does much more!

Before Operating Read These Important Safety Instructions

The lightening flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated ‘dangerous voltage’ within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock.

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.

Read these instructions, keep these instructions. Heed all warnings, follow these instructions.

WARNING : Amplifiers and components inside them contain potentially fatal high voltages. Voltages are present when the amplifier is turned on and also for some time after the amplifier has been turned off. You can still get an electric shock when an amplifier is turned off and disconnected from the power.

All installations and product adjustment / removals must be performed by an Orange Amplifier approved fitting centre.

Disclaimer: Orange Amplifiers, its suppliers and subsidiaries accept no liability for any damage(s), injury(s) or death incurred from or while installing or using this product.

It is the responsibility of the authorised installer to perform the installation strictly in accordance with the installation guidelines. The installer will take full responsibility for the installation. Orange Amplifiers will only accept liability for their own branded product. For the avoidance of doubt, not the customers amplifier or installation work undertaken.

Do not open the equipment case. There are no user serviceable parts in this product. Refer all servicing to qualified service personnel. Unauthorised modification of this equipment is strictly forbidden.

If the product does not operate normally when the operating instructions are followed, then refer the product to a qualified service engineer.

All electrical and electronic products should be disposed of separately from the municipal waste stream via designated collection facilities appointed by the government or local authorities.

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