Influence of the delay amplifiers for listening characteristics - Page 7

Federmann · 19th December 2009, 08:04 AM

Quote:

Originally Posted by Upupa Epops

We are not interested for your prehistory circuits from the year 65' or so...

Please Do I just what you're interested. I do not know of anyone who did Vdif dependence and feedback, even in 1965. Can you please give a link? I'm interested.

I wish a beautiful day

akis · 19th December 2009, 08:20 AM

Could anyone please explain in English what this is all about? Looks really interesting.

Upupa Epops · 19th December 2009, 08:30 AM

What is direction of your claims ? At your pages you say, that is correlation between value Vdif and " transistor sound " - do you have some credible evidence proof for it ? Independent listening tests, made by others, not by you ?

Don Hills · 19th December 2009, 08:31 AM

As I read it:
He sees a delay between the input signal and the output signal. (Another way of describing phase shift.) He wonders if it is audible.

Upupa Epops · 19th December 2009, 09:03 AM

No, he claims it...

BV · 09:26 AM

Mr. Fedemann is posting only simulations and claims, never showed measurements (distortion, SR with load..) of really operating (and reliable) power amplifier or any proofs for his claims. Never answered direct questions, only with "side steps"...But 3D simulations of PCB are nice

His last finding-local NFB is very bad, only valuable is global NFB...

akis · 19th December 2009, 09:51 AM

Quote:

Originally Posted by Don Hills

As I read it:
He sees a delay between the input signal and the output signal. (Another way of describing phase shift.) He wonders if it is audible.

Unless it is a varying phase shift (with time, frequency, amplitude) how would you tell?

What causes phase shift in a normal audio circuit? There must be some capacitors somewhere.

Federmann · 19th December 2009, 11:13 AM

Quote:

Originally Posted by akis

Unless it is a varying phase shift (with time, frequency, amplitude) how would you tell?

What causes phase shift in a normal audio circuit? There must be some capacitors somewhere.

Phase shift caused by the internal structure of the transistor. I use such a model.

Federmann · 19th December 2009, 11:20 AM

Overall feedback characteristics will improve.

Local feedback properties deteriorate.

Federmann · 19th December 2009, 11:25 AM

Distortion is inversely related to reserve profits. The overall feedback gain improves. Local feedback gain worse.

19th December 2009, 09:23 AM	#66
BV diyAudio Member Join Date: Sep 2005 Location: Trnava, Slovakia	Mr. Fedemann is posting only simulations and claims, never showed measurements (distortion, SR with load..) of really operating (and reliable) power amplifier or any proofs for his claims. Never answered direct questions, only with "side steps"...But 3D simulations of PCB are nice His last finding-local NFB is very bad, only valuable is global NFB... Last edited by BV; 19th December 2009 at 09:26 AM.

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19th December 2009, 08:20 AM	#62
akis diyAudio Member Join Date: Jul 2008	Could anyone please explain in English what this is all about? Looks really interesting.

19th December 2009, 08:30 AM	#63
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	What is direction of your claims ? At your pages you say, that is correlation between value Vdif and " transistor sound " - do you have some credible evidence proof for it ? Independent listening tests, made by others, not by you ?

19th December 2009, 08:31 AM	#64
Don Hills diyAudio Member Join Date: May 2009 Location: Wellington	As I read it: He sees a delay between the input signal and the output signal. (Another way of describing phase shift.) He wonders if it is audible.

19th December 2009, 09:03 AM	#65
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	No, he claims it...

19th December 2009, 11:20 AM	#69
Federmann diyAudio Member Join Date: Oct 2009 Location: Kunovice - Moravia	Overall feedback characteristics will improve. Local feedback properties deteriorate.

19th December 2009, 11:25 AM	#70
Federmann diyAudio Member Join Date: Oct 2009 Location: Kunovice - Moravia	Distortion is inversely related to reserve profits. The overall feedback gain improves. Local feedback gain worse.

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