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Old 27th December 2007, 11:22 AM   #481
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Question Low Jitter clock generator to upgrade Cd player or transport !

Hello guys !
I plan to upgrade my CD-104, and reading all this post, after some caps upgrade, i think maybe wthis will be interesting upgrade !

Click the image to open in full size.

Would you tell me your opinion?

Can be orderd with clock you prefer for aditional 20 bucks @ http://diykits.com.hk/OPA.htm

Also, is on eBay @ this moment:

Low Jitter clock to upgrade Cd player Usb to spdif dac

... and i need some good technical advice how to connect this upgrade to CD-104


Regards !
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Old 30th December 2007, 10:19 AM   #482
jives11 is offline jives11  Europe
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Default a good idea but ....

note that these older 14 bit players have a lower clock speed of 4.2336 Mhz, so you may have to use a 74HCT74 to divide a higher clock frequency. Alternatively you could approach them and see if they'd do a lower frequency clock version ? There are plnety of variants of the CD104 that could use a straight drop-on clock.

A number of people have done this the diy way and have had good results , for example here :

CD 104 clock upgrade

and also here :

Japanese CD34 mod site
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Old 31st December 2007, 03:17 AM   #483
Richard is offline Richard  Australia
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Hi Komigenie,

I have used a KWAK clock with good success in these old Philips players (CD304) using the original 4.2336 Mhz crystal. The KWAK clock responds to a variety of frequencies and can be put together on a perf board. There is a write up on this at http://www.diyparadise.com/clock.html

My kwak clock is built on a PCB with SMD components that I got from a club project.

I also have used a Hagclock in a later model Philips Cd473. Both clocks performed well but I haven't compared them head to head in the same player yet.

Jim indicated that his hagclock should be able to run on these low frequencies but I have not tried yet.
http://www.hagtech.com/hagclock.html

I did find that a preregulated power supply for the kwak with seperate transformer improved its performance.

Cheers

Rich
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Old 9th February 2008, 08:02 PM   #484
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Quote:
Originally posted by wojtek.l
generally cd104 is similar to cd7550 but cd7550 has extra special ground for kill HF intermodulation
hi,
is it possible knows special ground , or see picture of this?

thank
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Old 10th February 2008, 11:08 AM   #485
jives11 is offline jives11  Europe
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me too. From these pictures it looks more like the 2 boards have their own screened 'box', but the boards look standard Philips

http://www.dcaudio.kgb.pl/grundig7550.htm
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Old 10th February 2008, 11:29 AM   #486
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by jives11
me too. From these pictures it looks more like the 2 boards have their own screened 'box', but the boards look standard Philips

http://www.dcaudio.kgb.pl/grundig7550.htm

That looks like a standard CD-304 to me.

The 'box' is part of the cast chassis

Maybe the reference is to the ground plane on the boards


Andy
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Old 10th February 2008, 12:41 PM   #487
jives11 is offline jives11  Europe
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yes - I remain to be convinced about the 7550. It looks to be a OEM'd Philips machine . I do like the simplicity of the frontal design - some Philips models have lots of clashing colours and logos. However it seems to have a reputation for being better than a standard Philips , though it's hard to find any evidence to substantiate this . The Meridian and Mission variants had reworked analogue sections, but the 7550 looks to be completely standard.

I also subscribe to the LS3/5a forum on yahoo, as I have a pair of the Goodmans variety, and some manufacturers versions are considered better than others despite all conforming to a rigorous BBC specification. So some makers have more credibility than others

I would love to see either a schematic or photo of actually what is different in the 7550 from a standard Philips 104/304Mk1 ?
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Old 10th February 2008, 10:35 PM   #488
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Hallo everybody!

I've got a cd-104. It is functioning normaly. But there is one thing that bothering me. I opened the cover and noticed that some resistors and capacitors in a reverse side of the PCB are resoldered or, maybe, changed. I mean the little ones. Somebody used a lot of solder and it obvious that somebody repaired it earlier. Mainly the resistors and caps around sa7000 and in the output stage in bouth channels. Why did they do it? The only way to find the answer is to trace all connections and part nominals. Therefore, please somebody give me a compelete service manual on english. My E-Mail is solid_snake (AT) ukr.net

By the way, I saw some pictures of CD-104 in this forum, and I noticed that the transport mechanism in my player is different than in those on pictures. Others uses brushless CD drive motors, mine is not, also in my player transport is metalic, in others is aluminium (or..., could I be wrong?). And it looks compeletly different. Could it be CDM-0? My player is silver, not gray, maybee the oldest model.
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Old 11th February 2008, 07:06 AM   #489
jives11 is offline jives11  Europe
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Quote:
Originally posted by Hector Gonzales
Hallo everybody!

I've got a cd-104. It is functioning normaly. But there is one thing that bothering me. I opened the cover and noticed that some resistors and capacitors in a reverse side of the PCB are resoldered or, maybe, changed. I mean the little ones. Somebody used a lot of solder and it obvious that somebody repaired it earlier. Mainly the resistors and caps around sa7000 and in the output stage in bouth channels. Why did they do it? The only way to find the answer is to trace all connections and part nominals. Therefore, please somebody give me a compelete service manual on english. My E-Mail is solid_snake (AT) ukr.net

By the way, I saw some pictures of CD-104 in this forum, and I noticed that the transport mechanism in my player is different than in those on pictures. Others uses brushless CD drive motors, mine is not, also in my player transport is metalic, in others is aluminium (or..., could I be wrong?). And it looks compeletly different. Could it be CDM-0? My player is silver, not gray, maybee the oldest model.
Hi Hector, service guide is on it's way (12Mb !). Your player sounds very interesting. I assume it says it is a CD104 on the front ? Are you able to post some photographs ? The soldering you mention may be someone trying to solve the warm up/griplet problem by trial and error . Replacing the tiny surface mount caps around the TDA1540's is a recognised tweak, but not one I'd be brave enough to attempt
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Old 11th February 2008, 08:43 AM   #490
apm is offline apm  Bulgaria
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Hi all,
i want compelete service manual too! My E-Mail is :
atanas_mil4ev(AT)abv(DOT) bg

thanks

Atanas
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