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My Cambridge 640a amp buzzs from within sometimes loudly why is this?

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Most likely a fault, perhaps the transformer. However if you open the top, and listen with a tube to your ear (such as a drinking straw) you can track down what's making the noise. The best thing to do is replace the noisy thing.

Posted on Oct 07, 2009

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Cambridge audio 640a problem, olume goes to zero, I hear a little bang on speakers, light starts blinking!


This sounds like there's an overload in the main amp section. Often caused by a short-circuited device.

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I cannot open my cambridge audio 640A compact disc


This is a common issue with all belt-drive cd players, all you have to do is to change that belt and you should be done, or take it to a shop for servicing, as this is a part of a simple service maintenance routine, cheap fix though.

Nov 02, 2013 | Cambridge Audio Azur 640A Amplifier

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Running four S70 Siroccos off the amp, everytime volume gets halfway the protection is cutting in with protection light flashing three times? When reducing down to two speakers amp cuts out three quarters...


You are overloading your amp. IMO 640A cannot handle heavy loads.

Better change the speaker combo and connect something that puts right load on the 640A. Else, get a meaty amp from CA.

Mar 04, 2011 | Cambridge Audio Azur 640A Amplifier

1 Answer

HI, Can the Cambridge Audio 640a integrated amp be used as a preamp if I buy a separate power amp.


Of course, just run an audio RCA pair out from the Pre Out to your next amp and any input. All control for volume, tone, etc will remain with the 640A.

Jan 26, 2011 | Cambridge Audio Azur 640A Amplifier

1 Answer

I have a Cambridge Azur 640A amp, every time I turn the volume up to over 12 oclock the amp shuts down. Can this be changed? I presume this is a safety mode on the amp. Can you help?


Yes, you are right. That's a protection feature to prevent burnouts. Typically it appears when your speakers are sucking up a lot of load from the amp. Please check your speaker impedance and the amps' output impedance and ensure the wiring are properly done. Some amps are soo sensitive that they may cut-off after certain level due to overload.

Jan 06, 2011 | Cambridge Audio Azur 640A Amplifier

1 Answer

Cambridge azur amp 640a working brill till yesterday !! now protection light !!!! turned it off numerous time etc plenty of venterlation carnt get it to work


Looks like the fuse blown.. or the classic symptom of electrical fault inside the amp. 640A uses a sensitive protection circuit often ends up in this irritating situation. Normally, there is nothing much you can do, but just check your wall plug connection for Open Ground or Left & Neutral reversed issues. If the wall plug is free of error, then you should better contact CA technical support.

Dec 08, 2010 | Cambridge Audio Azur 640A Amplifier

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My azur 540a/640a v2.0 amplifier is not working.


Loud buzzing normally means dc on output or through your spaeker,amplifier needs to be serviced as it is faulty

Dec 25, 2008 | Cambridge Audio Azur 540A Amplifier

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