Cambridge Audio 640C V2

wineds · 25th August 2006, 05:43 AM

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

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

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

Cambridge Audio 640C No audio output PLEASE HELP!

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 4700µF 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 ?

25th August 2006, 05:43 AM	#1
wineds diyAudio Member Join Date: Apr 2006 Location: Melbourne	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?

26th August 2006, 09:00 AM	#7
tubenut diyAudio Member Join Date: Nov 2002 Location: South Africa, Jhb	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.... __________________ Guillaume Croak Audio Exploration

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25th August 2006, 05:52 AM	#2
johndiy Banned Join Date: Aug 2006	id change the caps only because i have no experience at mod go for it john

25th August 2006, 11:07 AM	#4
adinica diyAudio Member Join Date: Mar 2005 Location: bucharest	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).

25th August 2006, 11:12 AM	#5
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Use OP275 for Marantz. They match.

26th August 2006, 12:03 AM	#6
wineds diyAudio Member Join Date: Apr 2006 Location: Melbourne	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.

27th August 2006, 08:18 AM	#8
wineds diyAudio Member Join Date: Apr 2006 Location: Melbourne	Thanks Tubenut. You are right, OPA627 is a single I may try OP249 or AD8620. But I will make sure I can revert to the original configuration in case it sounds worse. Thanks!

9th December 2007, 03:35 PM	#9
Kajman diyAudio Member Join Date: Jan 2006 Location: WILTSHIRE	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 Cambridge Audio 640C No audio output PLEASE HELP! 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 4700µF 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 ?

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