Aura CDP • Clean up & upgrade

[Malefoda]

like I said about my new amp: ( Aura Evolution VA100 • Clean up & upgrade )

I've just been given an Aura integrated amp, wich was a attemp of B& W to sell electronic stuff.
I've also been given the matching CD player from Aura but it's more close to normal Philips' stuff and maybe it's just another Philips with a new shell. Anyway this CDP will also be cleaned up and some parts upgraded.

There are the pics:

Output:

DAC under PCB:


So a CDM 9.65 mech with dead gear, BB OPA2604 with Nich Muse at their side. Another AOP near the PSU, a simple JRC4560.
Under the PCB is a SAA7321GP.
Anyone recognize a Philips CDP with has been upgraded with good result?
After havin my amp up I'll use the left parts here, maybe I'll have some LM4562 left, some caps...
Any toughts? Someone with schematic?

Thanks,
Matthieu

[poynton]

Hi

The only Philips player I could find with this chipset and CDM is the CDI-910.

Is the TDA8809 OK ? It looks fried or is that the photo ?

http://pdf1.alldatasheet.com/datashe.../TDA8809T.html

It's a bitstream player so the usual things apply.

Multi-power supplies.
Change the output to discrete.
etc

The muse caps are good quality

Plenty of room for mods anyway !!!

Andy

[Malefoda]

Hi Andy,
no it's in full working condition but the tray gear (not a prob anyway).
I'll go for free upgrade right now, not much even for it will be a bedroom, living room or even garage as I already have my budget system but well modded (even if the CDP still has its LM4562... another story). Maybe put no more used parts from my Marantz CD53 in this (as caps, regs or such...)
Bye bye AOP2604 and welome LM4562, bye bye muting transistors.
I haven't seen where the Muse are used, maye on the PS lines of the opamps? No DC blocking caps?
I don't know how sounds BB OPA2604 beside LM4562 but it will be an easy upgrade for sure. Have to find some Philips CDi infos seems!
Will tell ya!

[poynton]

The muse caps are usually non polar versions as output caps.

Andy

[Malefoda]

Ok I'll have a look, maybe take them away... integrated should have a DC blocking system anyway? I wonder how much DC offset I can allow at the CDP output... I need bass!
I have 3 VibraPod feet around, maybe sell them on eBay and get good caps instead, not sure feet is right now the way to go

[RCruz]

10mV would do no harm I believe.

Place some regs on dac and decoder.

Replace the decoupling caps around the chips.

Remenber the schottky diodes.

Let us know after each mod.

Regards

Ricardo

[Malefoda]

Ok, I'll go for classics
This winter, right now I'm just checking and make up my mind on this.

[Mooly]

You need to measure DC offset via a low pass filter, say 10k + 1 mfd connected directly to the output sockets. There could be to much hash to get a reliable DVM reading without.
OPA2604 are excellent sonically.

[poynton]

Originally posted by Malefoda
Anyone recognize a Philips CDP

You are right. The main board does have a very "Philips" look to it.

I wonder what it is?

Andy

[Malefoda]

Originally posted by Mooly
You need to measure DC offset via a low pass filter, say 10k + 1 mfd connected directly to the output sockets. There could be to much hash to get a reliable DVM reading without.
OPA2604 are excellent sonically.

I'm not an expert but I guess this is when remove the DC blocking caps, I'll try that thanks!
Any opinions to the LM4562 vs OPA2604 sound?