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The 640P uses more exotic amplification circuitry to provide even lower
distortion and noise plus the higher gain stage for MC cartridges. In
addition, the 640P employs multi-parallel capacitors to achieve
exceptional RIAA accuracy of only 0.3dB up to 50kHz and features a
defeatable subsonic filter.
Now we invite you to sit back, relax and enjoy!
Matthew Bramble
Technical Director
2 Azur phono pre-amplifier
Thank you for purchasing this Cambridge Audio azur series phono pre-
amplifier. It is the result of our ongoing research and development
program for over three decades of producing high quality audio
products. We hope that you will appreciate the results and enjoy many
years of listening pleasure.
About this phono pre-amplifier
The design of a high quality but cost-effective phono pre-amplifer
presents a major challenge. Providing first-class performance on an
unlimited budget is one matter; achieving the same performance within
tight price limits is quite another, and requires all the expertise and
experience that Cambridge Audio brings to its product design process.
We believe we have succeeded in our aim of creating a first-class
affordable product.
The 540P features a moving magnet stage whilst the 640P offers
moving magnet and moving coil stages. Both use discrete transistors for
the all-important input stages instead of the more common integrated
circuits.
Both are designed to produce high gain and linearity, without requiring
massive amounts of negative feedback to achieve low distortion. These
new models also employ a single-ended Class A gain stage with
audiophile passive RIAA equalisation.
High quality components are used throughout such as 1% metal film
resistors and close tolerance polypropylene capacitors.
INTRODUCTION
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540P/640PPhono pre-amplifer
Azur phono pre-amplifier 3
Introduction .................................................................................................2
Important safety Information......................................................................3
Rear panel connections..............................................................................4
Troubleshooting......................................................................................... 6
Specifications ............................................................................................6
Limited warranty....................................................................................... 7
CONTENTS
Please take a moment to read these notes before installing your Azur
phono pre-amplifier, they will enable you to get the best performance
and prolong the life of the product. We advise you follow all instructions,
heed all warnings and keep the instructions for future reference.
This unit must not be exposed to dripping or splashing water or other
liquids. No objects filled with liquid, such as vases, shall be placed on
the unit. In the event, switch off immediately, disconnect from the mains
supply and contact your dealer for advice.
Do not route the power cable so that it can be walked upon or damaged
by other items near it.
Electronic audio components have a running in period of around a week
(if used several hours per day). This will allow the new components to
settle down, the sonic properties will improve over this time.
If you do not intend to use this unit for a long period of time, unplug it
from the mains socket.
To clean the unit, wipe its case with a moist, lint-free cloth. Do not use
any cleaning fluids containing alcohol, ammonia or abrasives. Do not
spray an aerosol at or near the amplifier.
These units are not user serviceable, never attempt to repair,
disassemble or reconstruct the unit if there seems to be a problem. A
serious electric shock could result if this precautionary measure is
ignored. In the event of a problem or failure, please contact your dealer.
IMPORTANT SAFETY INSTRUCTIONS
