Marantz CD63 & CD67 mods list - Page 896 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd February 2008, 03:28 PM   #8951
diyAudio Member
 
Join Date: Jul 2005
Location: italy
Ciao Ricardo.
What is the results adding a 330 pF cap to the filter?

All noise, ALL, all, all noise, disappear.
P.s. i think a couple of good polistirene caps, 1%, costs about 3 euro?
Right?
  Reply With Quote
Old 2nd February 2008, 03:46 PM   #8952
poynton is offline poynton  United Kingdom
diyAudio Member
 
poynton's Avatar
 
Join Date: Mar 2005
Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
Default Re: Re: Re: Re: About LD1086 +5V Reg

Quote:
Originally posted by RCruz

Hi Andy can you post some pictures ?
What type of valves did you use ?
How complicated is the PSU ?...............................
Ricardo

Hi,
I would love to post some pictures but I am not at home at the moment....................got to work sometimes!!

The PSU was very simple, 6v regulated for the heaters and 30v regulated for the 'HT'.

I used a variety of tubes fron ECC88 to subminature [pencil] tubes.
Pictures of both Ray's and my valve stages are on the thread.


Andy
  Reply With Quote
Old 2nd February 2008, 04:48 PM   #8953
avr300 is offline avr300  Denmark
diyAudio Member
 
avr300's Avatar
 
Join Date: Sep 2005
Location: DK
Quote:
Originally posted by RCruz

I am interested but can not try before I fully undersand wht to expect.
Why not ? Trust your ears. Let yourself be surprised.
  Reply With Quote
Old 2nd February 2008, 05:01 PM   #8954
6h5c is offline 6h5c  Netherlands
One Seriously Addicted to Audio and Electronics
diyAudio Member
 
6h5c's Avatar
 
Join Date: Apr 2004
Location: Heerhugowaard
My point exactly...
__________________
Gonna buy my little girl a pink soldering-iron
The new DOS-CFP board is out!
  Reply With Quote
Old 2nd February 2008, 05:24 PM   #8955
diyAudio Member
 
Join Date: Sep 2007
Default Re: Re: Re: Re: About LD1086 +5V Reg

Quote:
Originally posted by RCruz

Andre, Can you explain your comment ?

Ricardo
Perhaps I'm only looking for trouble from the "valve" guys

I'm refering to the way electron flow through the device is controlled, only the fet is much smaller with no need for heater voltage etc.

André
  Reply With Quote
Old 3rd February 2008, 10:24 AM   #8956
diyAudio Member
 
Join Date: May 2005
Location: TN
Quote:
I am interested but can not try before I fully undersand wht to expect.

Hi all,
hi Ricardo,

The question it's correct.

The sampling noise is not "white noise", but a consistent harmonics frequency residue of oversampling dac.
The PWM outputs of dac produce a broad spectrum of "coherent noise", is so common that differential.
Strangely CD63 is filtered only in the common mode RC cell, while no differential.
The filter opamps not have an adeguate high frequency differential rejection on PWM frequency working.
The result is that the opamps generate IMD. The IMD of opamps + noise results in a consistent IMD broad spectrum floor in the all audio band.
The noise foor of a original CD63 is about -90dBV, almost all formed by IMD or sampling residue, rather than players with philips CD471 is about -110dBV.
After modifing with 2 capacitors, the noise floor of CD63 becomes approximately -100 -105dBV because the opamp work in more linear conditions .
The result is a very precise and "natural sound" (because lack the IMD precisely....)
I believe that this is the most serious problem of CD63 MKII Kis, most serious that Jiitter and group delay ....

But this is "only my opinion".
All you can try to measure or to listen to the differences and decide whether this is or is not a problem to be solved ...

ciao

Mauro
  Reply With Quote
Old 3rd February 2008, 12:25 PM   #8957
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
Quote:
Originally posted by riccardo
Ciao Ricardo.
What is the results adding a 330 pF cap to the filter?

All noise, ALL, all, all noise, disappear.
Hi Riccardo

I believe the noise can substantially be reduced with this method but it will alter the overall response of the player right ?

I believe it will reduce noise and also reduce high frequency response.

Can you comment please ?

Regards

Ricardo
__________________
RC
  Reply With Quote
Old 3rd February 2008, 12:51 PM   #8958
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
Quote:
Originally posted by avr300


Why not ? Trust your ears. Let yourself be surprised.

Quote:
Originally posted by 6h5c
My point exactly...
I am sure this is ok for you guys but I only have one CD53 already very well modded.

All the mods I did where based on proven experiments did by other participants in this forum.

I must be 100% sure of the final results before I make any modifications.... As I only have one CD53 and must be very carefull with it and never modify just to "see what happens".

Did any of you experiment with this 330pF differential filter ?

Regards

Ricardo
  Reply With Quote
Old 3rd February 2008, 01:38 PM   #8959
diyAudio Member
 
Join Date: May 2005
Location: TN
Quote:
I must be 100% sure of the final results before I make any modifications.... As I only have one CD53 and must be very carefull with it and never modify just to "see what happens".
OK, Ricardo

If you is 100% sure of other full Subjective and/or extremize tweek, my simple technical observation is not adequate of this 3D....

The pass band amplitude, phase, and group delay it's one problem, and my modify have on this one limited impact (some like bessel filter solution), but the problem it's the attenuation over 300khz, some Ineffective in the bessel or "group delay correction" and dozens dB in my propose.
This reflected in low side band harmonics (audio band).

In my opinion, work on Nyquist is most important and accurate work instead on the psu regolator of a digital circuit, but this is only the vision of a professional electronic, little just experienced of diys problems....

ciao

Mauro
  Reply With Quote
Old 3rd February 2008, 02:34 PM   #8960
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
Quote:
Originally posted by mauropenasa

The pass band amplitude, phase, and group delay it's one problem, and my modify have on this one limited impact (some like bessel filter solution), but the problem it's the attenuation over 300khz, some Ineffective in the bessel or "group delay correction" and dozens dB in my propose.
This reflected in low side band harmonics (audio band).


Mauro

My observation was not directed to criticyse your fine work.

I am not a professional so I must rely on others experiences before I try anything.

I was just testing the forum to see if anyone had already tryed your technique and maybe get some practical advise.

Folowing your previous comment i understand that with your modd I will get lower noise and not affect the audio response.

I will try this modd and report back to you.

Best Regards

Ricardo
__________________
RC
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 08:55 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2