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Old 24th October 2011, 07:34 AM   #17591
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Ben

I don't have any bypass caps under my BG's at all as I found they made the sound worse too.

Brent
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Old 24th October 2011, 03:51 PM   #17592
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You're right. I was also very vague in my post. My problem is this. On the CS4398 DAC for my Marantz CD6003 on pin 26 is the capacitor C756. The value is 3.3 50V. I could use a 50V with a value of 10? (BG n).
I wonder why I read the datasheet for the CS 4398 that the filter capacitor on pin 26 is very critical.
I also have another question for more experienced than me. For a dedicated power supply to the DAC CS4398 , 7VA are enough? I ask this because I want to use the 'clock PSU 9v 7VABy Fidelity Audio. Fidelity Audio : clock power supplies psu
thanks

Last edited by GHEORGHES; 24th October 2011 at 04:07 PM.
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Old 26th October 2011, 12:45 PM   #17593
6h5c is offline 6h5c  Netherlands
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Hi Gheorghes,

Nice work, you managed to squeeze quite some stuff in there!

C756 provides decoupling for internal circuitry, so by critical they mean you have to use a good cap, and the shortest possible connection so there's no additional noise introduced into this pin. Is it a standard electrolytic in there now?

3.3uF is the value that is sufficient for good operation of the DAC, but a larger cap means less ripple most of the times, so maybe a 10u BG with it's low impedance will improve things further. Just use your ears! Another good option is a 3.3uF film cap, like Wima MKS. They have even lower ESR and have very low leakage current, which seems an important factor at this particular pin.

So the verdict is: bypassing a good cap is a bad thing

Regards,

Ray
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Old 27th October 2011, 06:53 AM   #17594
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Hi Ray
Thanks for your advice. Yes C756 Is a standard electrolytic now.
You can help by answering my second question?
For a dedicated power supply to the DAC CS4398 of my Marantz CD6003 , 7VA are enough? I ask this because I want to use the 'clock PSU 9v 7VA By Fidelity Audio. Fidelity Audio : clock power supplies psu
Used as a pre-regulatet power. Now the DAC before the regulators has only 4 diodes and 1 capacitor fed from the main transformer
thanks
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Old 27th October 2011, 07:45 AM   #17595
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Hey guys, I might have some time off on the horizon. Does anyone fancy putting these in priority order for me?

1. DAC clock
2. Servo clock
3. DOS

I have 1 flea and 1 DOS-cfp PCB ready to go, courtesy of Ray. I just need a clear focus and a definitive parts list.

Quick recap of my mods so far: CD63KI, full BG + silver mica recap, 3x Mundorf SI on PSU, Martin Clark LM317-based 5v on nearly all chip supplies, LM4562 op-amps + bypass, HDAM bypass.

P.S. Thanks to everyone who rallied to confirm what I've been hearing with bypass caps. There's a lot of conflicting opinion out there on the interwebs, but I trust my ears and you guys.
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Last edited by Ben Hanke; 27th October 2011 at 08:03 AM.
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Old 27th October 2011, 04:19 PM   #17596
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by GHEORGHES View Post
Hi Ray
Thanks for your advice. Yes C756 Is a standard electrolytic now.
You can help by answering my second question?
For a dedicated power supply to the DAC CS4398 of my Marantz CD6003 , 7VA are enough?...
thanks
Hi,

Yes, 7VA will be more than plenty to feed the DAC.

Quote:
Originally Posted by Ben Hanke View Post
Hey guys, I might have some time off on the horizon. Does anyone fancy putting these in priority order for me?

1. DAC clock
2. Servo clock
3. DOS
...
Hi Ben,

I think you have them in the right order, maybe 2 and 3 can be swapped. It all depends on the state of your analog output stage. But I'd say a DAC clock is most important.

Ray
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Last edited by 6h5c; 27th October 2011 at 04:23 PM.
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Old 27th October 2011, 07:21 PM   #17597
Thomo is offline Thomo  United Kingdom
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Quote:
Originally Posted by Ben Hanke View Post
Hey guys, I might have some time off on the horizon. Does anyone fancy putting these in priority order for me?

1. DAC clock
2. Servo clock
3. DOS
Defo the correct order.

Adding a big tx (~50va) to supply the driver ic's is also VERY important, more so than adding a DOS, imo.

Lee.
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Old 27th October 2011, 10:10 PM   #17598
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clocking dac and servo a must imho.
best gains for me.
alam
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Last edited by bikeral10; 27th October 2011 at 10:13 PM. Reason: misspelling
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Old 28th October 2011, 07:23 AM   #17599
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by GHEORGHES View Post
HI Ray
...

I have the service manual cd de 6004, can be used for your site?

Thanks for the 'want to help me. Congratulations for your work!
Hi Georghes,

I checked it, and I don't have the service manual for the 6003/6004 yet. So if you'd like to share it, that would be great! Just send me a PM.

Regards,

Ray
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Old 28th October 2011, 09:30 AM   #17600
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Hi Ray
I am happy to be useful, Which email address?
Giorgio
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