Audio grade capacitors

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01-Mar-2019 11:24 AM

Ton

Ton

Posts: 52

Hi all, 

I want to recap my CD66 and replace all 33 electrolytic capacitors.

Looking inside the CD66 to make a list of values and voltages (not included in the service data manual), I noticed two “different” looking elco’s, numbers 2672 and 2673, both connected to pin 7 (out) of the LM833N, see the main circuit diagram.

Both of these 100 uF capacitors are so called “Nichicon Muse Audio Grade” capacitors.

Whatever you may think about “audio grade components”, I find it remarkable that Quad used these special components, as Quad is known for making use of normal standard parts.

Of course I will replace both “Muse” parts with modernNichicon Muse UKZ series capacitors, or perhaps the FG series.  

The question is, does it makes sense to use audio grade caps for some of the other capacitors In the CD66, and for which would it make a difference.

Strange enough the Nichicon MuseUKZ capacitors are not very expensive.


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01-Mar-2019 11:43 AM

Ton

Ton

Posts: 52

b.t.w., those "Muse" caps look like they are bipolar caps ? 

Is there a reason why Quad used a bp cap ?

Would it be a problem if I use a polarized cap ?

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03-Mar-2019 11:09 AM

harvey

harvey

Posts: 2

Hi

fyi: the CD66 is a Philips layout like thePhilips CD-582.

Search for information about Philips CD Player of the 80`s for example:

http://www.troeszter.net/Download/Audio/Philips_CD-Player_Modifikation_XXL.pdf


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03-Mar-2019 02:04 PM

Ton

Ton

Posts: 52

Hi Harvey,

Thank you for sending me the link. The document  is really a gem !
Fortunately, it is no problem to read texts in German, otherwise it would be difficult to understand.

The document contains tons of tips and looking at the photo’s of the main board, it is amazing how much the mainboard of the Quad CD66 looks like that of a Philips CD-582. It looks like they match for 100%, components for 99%.

I will certainly use some of his his recommendations, so not only changing the electrolytic capacitor’s, but also look at the rectifiers and the opamps LM833N.

thanks again for sending it.

Regards, Ton

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03-Mar-2019 08:01 PM

Marcel

Marcel

Posts: 19

Hello Harvey,

Many thanks (vielen Dank) for the link to an article containing extensive information on the Philips CD-582. I own a CD66 so this article gives some interesting reading. Thanks.

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04-Mar-2019 08:55 AM

EJP

EJP

Posts: 1559

I have no information on this but I guess you have to consider the possiblity that the PCB was made by Phillips, not by Quad.
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04-Mar-2019 11:36 AM

chartz

chartz

Posts: 7

Hi,

The original Muse caps are very reliable, and were actually chosen by Philips, not QUAD.

The op-amp change will do nothing either.

Just replace the tired PSU caps, the two caps on the display PCB and you're done.

The rest is just useless.

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04-Mar-2019 04:42 PM

Ton

Ton

Posts: 52

Thanks for the update,

I overlooked the two caps on the display PCB. 

About the remark EJP made, could well be that Philips designed/build the pcb for thw Quad CD 66. 

There are codes/labels on the mainboard that could reference the pcb designer, but I can't find any xref on the internet. And in the document, those codes are unreadable. 

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04-Mar-2019 06:06 PM

chartz

chartz

Posts: 7

It is certain that it is a Philips design. The complete PCB was manufactured in Belgium and it was also used by Philips themselves, as well as Marantz.

I have several players with the same PCB, brown or green, and they all have the same components, among which the Muse bipolars. 

That said, QUAD used a CDM4/16 as most others used a CDM4/19, but there is little to it other than that.

It is a Philips player in a QUAD box.

Provided the caps are of reasonable quality (Nichicon,Elna, Panasonic come to mind), any caps will do. Please do leave the Muse bipolars in place.

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04-Mar-2019 09:11 PM

Ton

Ton

Posts: 52

That makes sense then, it is a Philips mb with some Quad adjustments. 

It's one of the rare players that use the CDM/16, I only know of two other players using that particular transport.

Many many use the CDM/19, but it seems that not all will work if you replace the transport with a CDM/19

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04-Mar-2019 09:36 PM

Ton

Ton

Posts: 52

Yes, I will replace the Muse bipolar's by Muse bipolars :)

One challenge is to find a replacement for the capacitor #2549. It's a bipolar electrolytic 0.68 uF 50V.

Been wandering around the internet for some time now but I cannot find any :(

Are they still available ?

I think I have to fall back to something like this  to get it fitted.

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04-Mar-2019 11:33 PM

EJP

EJP

Posts: 1559

Use a film capacitor. Polypropylene if it will fit. Much better than any electrolytic.
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04-Mar-2019 11:50 PM

Ton

Ton

Posts: 52

Thanks, will do that.

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