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-   -   Cambridge Audio 640C V2 (http://www.diyaudio.com/forums/digital-source/85325-cambridge-audio-640c-v2.html)

wineds 25th August 2006 05:43 AM

Cambridge Audio 640C V2
 
I have one of these CD players and I am very happy with it. Or at least I was unitl I pulled the lid off it last weekend. It is beautifully built inside with copper colored covers on the torriod and servo. The main PCB does contain a lot of average parts though - NE5532 for the filters (x6), 7815/7915 regs and cheap looking NP electo caps and filter caps in the PS. Seems like a lot of upgrade potential here. Anyone tried upgrading one yet?

Maybe OPA2134 for the filters, 2937/2990 for the regs and a sprinkling of Blackgates migth help?

johndiy 25th August 2006 05:52 AM

id change the caps only because i have no experience at mod

go for it

john

wineds 25th August 2006 06:15 AM

2 Attachment(s)
pic of inside...

adinica 25th August 2006 11:07 AM

Hi!
Unfortunatelly, the power trafo it`s not a toroid, it`s actually an el-core type. If you are happy with the sound, by changing some of the components like op-amps and capacitors, the new sound may become unpleasant for you.
It`s my case with my Marantz cd67se (modded with opa2134 and Nippon-Chemicon caps). :(

Salas 25th August 2006 11:12 AM

Use OP275 for Marantz. They match.

wineds 26th August 2006 12:03 AM

Adinica - If I remove the NE5532s, I will replace them with sockets so I can try many different opamps like OPA627 maybe. Also, I can revert to NE5532 if things soudn worse.

tubenut 26th August 2006 09:00 AM

careful now... 5532 is dual, 627 single.
I would imagine the cambridge stuff to be voiced and designed so do one thing at a time so you can go back. Not all technically better bits sound better in all applications....

wineds 27th August 2006 08:18 AM

Thanks Tubenut. You are right, OPA627 is a single :xeye: I may try OP249 or AD8620. But I will make sure I can revert to the original configuration in case it sounds worse. Thanks!

Kajman 9th December 2007 03:35 PM

I am desperately trying to repair my cambridge audio 640 V2 CD player.

I have just started a new thread below though this one discusses mods you guys may be able to help

http://www.diyaudio.com/forums/showt...hreadid=113320


The player powers on, reads CDs and is doing all its supposed to do apart from not delivering any output on the analogue output.
I can only assume the fault is with DAC board as the transport seems fine even with the DAC bard removed.

The DAC has 9 regulators 7x 7805CV with a 7815CV/7915CV pair which got very hot (before the fault ) All these reglators do not have any heatsinks and I feel will fail with time in these units. I have replaced all these and can now hear the output relay (mute??) click on power on and switching tracks which it had stopped doing when the audio went BUT I still have no audio output.
I have now replaced most capacitors apart from the 2 big smothing caps 4700F and 6 Non polars which I do not have but still no joy.

There are 4 small transistors by the relay 2 each of S8050 and C9012 which seem hard to source not that I am sure they need replacing. I would rather replace a couple of items in one go rather than removing and testing 1 at a time especially with cheap parts which cambridge audio have used.

Any suggestions ?

Garuda77 27th January 2014 07:45 PM

I know this an old thread but.....if you are having this 'no output' problem, or even if just want to improve this player, do the lampizator 'snip it' mod, a little reduced output level for a big improvement in sound quality...highly recommended.


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