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Old 23rd September 2012, 11:14 AM   #111
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hi, i am planing modding 640a azur. it seem nice option to upgrade the amp
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Old 23rd September 2012, 01:09 PM   #112
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Does one of the generous gentleman here wish to start a communal spreadsheet with a list of parts changes for the 640Av2

Go on, you know you want to
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Old 23rd September 2012, 01:12 PM   #113
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yeahhh.............. that good idea
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Old 17th November 2012, 05:39 PM   #114
sasha70 is offline sasha70  United Kingdom
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Good evening all,
I have modified my CA 540A a couple of years back.
Similar schematic to CA 640A.
Schottky diode on power rail,
Bigger caps at power rails and beside opamps,
Removed coupling caps from signal path,
Replaced pots, except volume,
Installed sockets for opamps and replaced opamp to 4562 (I thing),
Installed screen on cables going across board.
I have service manuals for some models of CA, please contact me if interested.
Best regards.
Sasha.
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Old 26th August 2013, 10:51 AM   #115
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Cambridge Audio | Owners Manuals, Service Manuals, Schematics, Free Download | HiFi Engine
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Old 17th April 2014, 06:48 AM   #116
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correct me if im wrong to my point of view to much in capacitance in supply rail is thier an improvement in sound? couse it think there is an exact capacitance in a given power of the transformer
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Old 24th May 2014, 07:34 AM   #117
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Anyone has a service manual for A640 V2 - it is misbehaving after modding. I only have V1 version but they are quite different.
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Old 24th May 2014, 10:25 AM   #118
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Hello Decky,

Attaced is the link to the service manual I used, it is revised May 2008, and as far as I remember it was quite accurate, still I gave up on the CA 640A v2 I had and sold it. Simply did not like the sound of it.

Anyway, this is the link, hope it helps:

640A Integrated Amplifier free ebook download

Saludos,

Manuel
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Old 25th May 2014, 01:56 AM   #119
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Thanks Manuel

I have that one - it is accurate but there are more than few differences between V1 and V2. I am especially curious about that protection implementation. I am suspicious that is plays some funny games with me - hopefully that controller is still in one piece. I also did a mod of V1 and that sounded lovely - hoping that V2 would be better - fools hope? Maybe?
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