Bob Cordell Interview: Error Correction - Page 2

lumanauw · 27th October 2006, 02:48 PM

Quote:

Where?

http://www.cordellaudio.com/papers/a...w_of_tim.shtml
fig.7

Mikeks,

Why is that Q7+Q8's emitors are not connected to output like Q5+Q6 and Q9+Q10? I saw this also in Fostexlab600 amp, Alesis RA500 amp, these amps also has the same connection, in triple darlington, the 1st and 3rd pair is connected to output, while the 2nd is not. What is the reason of such connection, do you know the reason why?

mikeks · 27th October 2006, 09:00 PM

This connection of Q7/Q8 makes for more rapid extraction of charge from the output device that's being turned off.

This cross-coupling should be extended to Q5/Q6 so as to cause them to operate in Class-A, regardless of output load.

Wavebourn · 27th October 2006, 10:00 PM

Quote:

Originally posted by mikeks
This connection of Q7/Q8 makes for more rapid extraction of charge from the output device that's being turned off.

This cross-coupling should be extended to Q5/Q6 so as to cause them to operate in Class-A, regardless of output load.

It is right, but who will diswcarge the cable and the speaker?

Though I like his interview, ...

mikeks · 27th October 2006, 10:17 PM

AJT · 28th October 2006, 02:14 AM

Quote:

This cross-coupling should be extended to Q5/Q6 so as to cause them to operate in Class-A, regardless of output load.

it may interest you to know that leach amps have both predrivers and drivers connected so...

Jonathan Bright · 28th October 2006, 02:46 AM

I was a little bit surprised that he didn't make more of the different types of high frequency compensation in the factors that effected sound quality. Around the time that the AES paper was pubilshed there was a small but renowned group that all used the same method. And they all flew in the face of current, majority opinion and in JLH's case a lot of flack from the minimal THD group. From memory they were, Nelson Pass, Bob Cordell, John Linsely Hood and Edward Cherry in Aust. I think from the JAES biogs Ed Cherry and Bob Cordell may have been at Bell Lab at one stage.

peranders · 28th October 2006, 06:20 AM

Quote:

Originally posted by janneman
Wow! YOU invented the gainclone? Or just the name?

I mean I was the first here using a DC-servo but I didn't call it "Super Gainclone".

I settled for "High Performance Gainclone".

thanh · 28th October 2006, 06:40 AM

I can't read the interview. Can you upload them to another host ?
Mikeks! Do you have a account at www.box.net ?

mikeks · 28th October 2006, 01:46 PM

Here:

MikeBettinger · 29th October 2006, 03:59 AM

Quote:

Originally posted by DCPreamp
Excellent interview. Very grounded in reality and science with subtle pokes at the psychology of subjectivism.

???! Never mind.

Regards, Mike.

28th October 2006, 02:46 AM	#16
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland Australia	I was a little bit surprised that he didn't make more of the different types of high frequency compensation in the factors that effected sound quality. Around the time that the AES paper was pubilshed there was a small but renowned group that all used the same method. And they all flew in the face of current, majority opinion and in JLH's case a lot of flack from the minimal THD group. From memory they were, Nelson Pass, Bob Cordell, John Linsely Hood and Edward Cherry in Aust. I think from the JAES biogs Ed Cherry and Bob Cordell may have been at Bell Lab at one stage. __________________ "It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse.

28th October 2006, 06:40 AM	#18
thanh diyAudio Member Join Date: Jan 2004 Location: ho chi minh city	I can't read the interview. Can you upload them to another host ? Mikeks! Do you have a account at www.box.net ? __________________ Justice for Victims of Agent Orange http://www.petitiononline.com/AOVN/Thank all of you!

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27th October 2006, 09:00 PM	#12
mikeks Account Disabled Join Date: Jun 2004 Location: Animal farm	This connection of Q7/Q8 makes for more rapid extraction of charge from the output device that's being turned off. This cross-coupling should be extended to Q5/Q6 so as to cause them to operate in Class-A, regardless of output load.

27th October 2006, 10:17 PM	#14
mikeks Account Disabled Join Date: Jun 2004 Location: Animal farm