X-bosoz vs. CCS X-bosoz, how does the sound compare?

acliao · 18th February 2004, 07:49 PM

Has anyone compared the sound of x-bosoz and ccs x-bosoz? I would like to get some feedbacks from all you experienced builders before I start my project.

Also where can I find the latest schematics on the either preamp? I searched the thread but got information overload as there are too many revisions. Can someone kindly guide me to the right thread or pages?

Thank you very much for your help.

Nelson Pass · 18th February 2004, 08:38 PM

Running balanced, they tend to be identical. Running with
the input or output unbalanced, the CCS gives better
performance.

acliao · 19th February 2004, 04:38 PM

Thank you for personally answering my question, Mr Pass.

Alain Dupont · 19th February 2004, 06:18 PM

Hi,

Playing with SYMetrix

Dou you think it could work like this, or do I need 2 current sources...

Speaking of a CCS X-BOSOZ

Regards.
Alain.

Bricolo · 19th February 2004, 07:44 PM

Alain, I'll try to answear your question.

By reading the ZEN V6 article this evening, I think I finally understood how susy works (at least in the sox and aleph-x configuration. I still don't understant the one in the patend

)

To explain it briefly (for a better explanation, read the zen v6 article), when one of the 2 polatities has a non linearity, in example a peak, it draws more current from the current source (CCS or resistor). The other polarity is connected to the same current source, so it recive less current (since the drawn current is constant) and this way, also shows a peak on it's output.

The 2 peaks are in phase on the balanced load-> they cancel out.

In conclusion, I would say that both polarities MUST share the same current source

Am I right, Nelson?

Henrik · 19th February 2004, 09:02 PM

Alain
You just need one CCS.

This CCS just works fine in my CD player.

Regards Henrik.

Nelson Pass · 19th February 2004, 09:13 PM

Quote:

Originally posted by Bricolo
By reading the ZEN V6 article this evening, I think I finally understood how susy works (at least in the sox and aleph-x configuration. I still don't understant the one in the patend )

The schematic in the patent was for confusing patent
examiners.

Nelson Pass · 19th February 2004, 09:17 PM

Quote:

Originally posted by Henrik
This CCS just works fine in my CD player.

I would add some output resistance to this circuit, as I have
occasionally seen some parasitic oscillations with odd loading
on this and similar circuits. I usually use about 221 ohms (I
have a lot of them).

Also, be prepared to trim the values of R113 and R114 depending
on the match quality.

Alain Dupont · 19th February 2004, 11:13 PM

Nelson, Bricolo and Henrick,

Thanks for your advises....

Henrick, I would like to keep a MosFet as CCS, because I have lots of IRF 610...

Have to see Nelson's patent, didn't get time, and on my Macintosh pictures
refuse to load, ahhhh these computers.... better use a Class A, always better results...

Nelson, thanks for the output resistance to be added.

I will make a try this week end, the last components order for my X-BOSOZ
will arrive tomorrow, **** of UPS, they stiked their second poster!

>> trim the values of R113 and R114 depending on the match quality
I will try to match under 0.02 volts for the final pair of 510/610
I think that it won't be a problem.

Thanks to all of you.
I keep looking for new idea's

Alain.

Bricolo · 20th February 2004, 07:15 AM

Alain: There's no problem in using a FET for the CCS, simply use the same CCS as in the Aleph P, and adjust the resistor for the wanted current.

Nelson: that's what I was thinking

BTW, was my explanation right?

18th February 2004, 07:49 PM	#1
acliao diyAudio Member Join Date: May 2002 Location: Los Angeles, CA	X-bosoz vs. CCS X-bosoz, how does the sound compare? Has anyone compared the sound of x-bosoz and ccs x-bosoz? I would like to get some feedbacks from all you experienced builders before I start my project. Also where can I find the latest schematics on the either preamp? I searched the thread but got information overload as there are too many revisions. Can someone kindly guide me to the right thread or pages? Thank you very much for your help.

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18th February 2004, 08:38 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	Running balanced, they tend to be identical. Running with the input or output unbalanced, the CCS gives better performance.

19th February 2004, 04:38 PM	#3
acliao diyAudio Member Join Date: May 2002 Location: Los Angeles, CA	Thank you for personally answering my question, Mr Pass.

19th February 2004, 07:44 PM	#5
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	Alain, I'll try to answear your question. By reading the ZEN V6 article this evening, I think I finally understood how susy works (at least in the sox and aleph-x configuration. I still don't understant the one in the patend ) To explain it briefly (for a better explanation, read the zen v6 article), when one of the 2 polatities has a non linearity, in example a peak, it draws more current from the current source (CCS or resistor). The other polarity is connected to the same current source, so it recive less current (since the drawn current is constant) and this way, also shows a peak on it's output. The 2 peaks are in phase on the balanced load-> they cancel out. In conclusion, I would say that both polarities MUST share the same current source Am I right, Nelson?

19th February 2004, 11:13 PM	#9
Alain Dupont diyAudio Member Join Date: Sep 2003 Location: Paris - France	Nelson, Bricolo and Henrick, Thanks for your advises.... Henrick, I would like to keep a MosFet as CCS, because I have lots of IRF 610... Have to see Nelson's patent, didn't get time, and on my Macintosh pictures refuse to load, ahhhh these computers.... better use a Class A, always better results... Nelson, thanks for the output resistance to be added. I will make a try this week end, the last components order for my X-BOSOZ will arrive tomorrow, **** of UPS, they stiked their second poster! >> trim the values of R113 and R114 depending on the match quality I will try to match under 0.02 volts for the final pair of 510/610 I think that it won't be a problem. Thanks to all of you. I keep looking for new idea's Alain.

20th February 2004, 07:15 AM	#10
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	Alain: There's no problem in using a FET for the CCS, simply use the same CCS as in the Aleph P, and adjust the resistor for the wanted current. Nelson: that's what I was thinking BTW, was my explanation right?