Marantz CD63 & CD67 mods list - Page 1007 - diyAudio
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Old 1st June 2008, 08:25 PM   #10061
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by RCruz
Work in progress
Ricardo,

It's great to see such extensive work being carried out on what was, some years ago, a humble budget machine. Your work is very neat

I look forward to hearing about the sound after the DAC analogue psu. I remember enjoying this modification greatly on my CD63!!

Simon
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Old 1st June 2008, 09:33 PM   #10062
RCruz is offline RCruz  Switzerland
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Thank you Simon.

Now I need a clock... hope I can manage some space for it inside.
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Old 1st June 2008, 09:44 PM   #10063
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by RCruz
Thank you Simon.

Now I need a clock... hope I can manage some space for it inside.
You need two clocks in that player

Then it will siiiiing!
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Old 2nd June 2008, 08:08 AM   #10064
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Good work Ricardo

Keep us posted whatr you think of this upgrade.

Brent
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Old 2nd June 2008, 09:33 AM   #10065
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by rowemeister
Good work Ricardo

Keep us posted whatr you think of this upgrade.

Hi Brent

From what I could hear yesterday, the sound is now more coherent with better high low freq integration.

There is less stridency in the highs.

I have been studying your pdf where you indicate to lift U197 U198 and connect directly to the star ground.

Now I have a doubt relating CD15 and CD16 GND. Should these GND be connected to the star earth as well ?

If so, how can I do it easily ?

Regards

Ricardo
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Old 2nd June 2008, 09:44 AM   #10066
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It is very hard to split all the gnds, you can run a wire from under those caps to the star. This gives you a more direct gnd path, not sure it will improve things though.

Brent
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Old 3rd June 2008, 01:49 PM   #10067
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by rowemeister
It is very hard to split all the gnds, you can run a wire from under those caps to the star. This gives you a more direct gnd path, not sure it will improve things though.

Hi Brent

With the new DAC psu in place, I notice a better integration of all frequencies... better overall balance, but I lost the BIG BASS impact that I had before.

I must get the bass back and I am thinking about the 470uF BG on the opamps as well as the 220uF BG on CD15 CD16.... should this be enough ?

Note that I am using 2200uF 6.3v MCZ Rubycon on CD15 CD16... can I expect improvements by changing to 220uF BG ?

Also, the new DAC psu is prepared to feed the DAC digital on separate line.... If I put a sreg on dac digital will I get some bass improvements ?

Regards

Ricardo
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Old 3rd June 2008, 02:06 PM   #10068
Thomo is offline Thomo  United Kingdom
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I would stick the bg's on cd15/16. They are a better cap, and this is quite a critical area (dac analog).

Also, in my experience digital lines sound better with smaller value caps. I use no more than 220uF on dac digital rails, I think it may be due to a faster response?

Lee.
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Old 3rd June 2008, 02:17 PM   #10069
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by Thomo
I would stick the bg's on cd15/16. They are a better cap, and this is quite a critical area (dac analog).

Also, in my experience digital lines sound better with smaller value caps. I use no more than 220uF on dac digital rails, I think it may be due to a faster response?

Lee.
Isn't this due to a larger ESL and increased ESR at higher frequencies of very large caps and their corresponding inability to effectively filter noise at very high frequencies?

This is why some people bypass caps for digital lines, but it's also been pointed out that small (nF range) caps have a very high ESR (across a wide range) so are also ineffective at decoupling psu rails.

The practical solution would seem to be to use a high quality capacitor of modest capacitance value close to the circuit being fed, or a no-compromise solution a large film cap next to each circuit, but to also ensure it doesn't cause the supply regulator problems (use of a good regulator perhaps required).

Simon
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Old 3rd June 2008, 04:56 PM   #10070
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by SimontY


Isn't this due to a larger ESL and increased ESR at higher frequencies of very large caps and their corresponding inability to effectively filter noise at very high frequencies?

This is why some people bypass caps for digital lines, but it's also been pointed out that small (nF range) caps have a very high ESR (across a wide range) so are also ineffective at decoupling psu rails.

The practical solution would seem to be to use a high quality capacitor of modest capacitance value close to the circuit being fed, or a no-compromise solution a large film cap next to each circuit, but to also ensure it doesn't cause the supply regulator problems (use of a good regulator perhaps required).

I agree Simon

I always believed that we need good large caps on analog rails and smaller caps on digital.

My best choice for digital decoupling is OsCon.

Should I use Oscon on +5v dac digital ?

Ricardo
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