Руководство Cambridge Azur 540A Усилитель

Руководство

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Thank yyou ffor ppurchasing tthis CCambridge AAudio aazur sseries aamplifier. IIt

is tthe rresult oof oour mmost eext

ensive eever rresearch aand ddevelopment

program iin oover tthree ddecades oof pproducing hhigh qquality aaudio pproducts.

We hhope tthat yyou wwill aappreciate tthe rresults aand eenjoy mmany yyears oof

listening ppleasure.

About tthis aamplifier

The design of any purist audio amplifier is mainly centred on two main

areas, the Power Supply and the driver stage's ability to drive the output

stage effectively. We at Cambridge Audio have researched the best

possible ways to achieve the highest performance in these areas, at a

sensible price. The Azur 540A/640A topology uses the same tried and

tested output devices that Cambridge Audio have used in previous

award winning amplifier models, but many hours of research have gone

into the study and development of the preceding stages. This driver

circuitry is essentially a matched differential input pair, loaded by a

current mirror and driven from a transient compensated current source

driving a high beta cascoded voltage gain stage. The thermally

compensated output stage is setup to inherently give optimum Class AB

conditions (for greatly reduced cross over distortion caused by dynamic

heating of the output dies). In addition the topology includes a further

improvement to the driver stage consisting of a pure class-A follower to

isolate the voltage amplifier transistors from the difficult loading of the

output transistors. This increased current drive to the output stage

combined with a novel transient feed forward circuit doubles the slew

rate to 40V/uS.

Due to critically refined circuit board layouts, careful component

placement and short signal paths the stability of these amplifiers is

extremely high which allows the compensation components to be

reduced in size. This has the effect of reducing distortion, increasing

dynamics and allowing the bandwidth to be opened up to a massive

80kHz, ideal for the new 'better than CD' high bandwidth sources such

as DVD-Audio and Super Audio CD.

The performance of any amplifier is limited by the dynamic abilities of its

power supply, and for this reason Cambridge Azur amplifiers incorporate

many features, including a low flux toroidal transformer, paralleling of

the reservoir capacitors and careful use of bypass capacitors, to allow

the instantaneous clean delivery of charge whenever it is needed. This

ensures an open and natural sound being reproduced and ensures a

positive response to any dynamics or sudden transients in the signal

being reproduced.

Particular attention has also been paid to the quality of the passive

components which have been carefully chosen for their sonic benefits.

The Azur 640A in addition uses high grade Polypropylene signal bypass

capacitors to improve signal flow and dynamics.

The Cambridge Audio Azur 540A and 640A amplifiers also incorporate

tone controls, which may be switched out of circuit in 'direct' mode for

the shortest and therefore purest signal path. Other features include

24k gold plated phono sockets, dual tape loops, pre amp output, a

headphone socket and a secondary set of high level loudspeaker

terminals.

An important feature which has been included as standard on both the

540A and 640A is the new innovative Cambridge Audio designed CAP5

protection system. This consists of a microprocessor which constantly

monitors the amplifier providing comprehensive protection against a

variety of possible faults. This has been achieved without adding any

active circuitry into the signal path to degrade the sound or the dynamic

abilities of the amplifier.

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