John Curl's Blowtorch preamplifier part II - Page 1900 - diyAudio
Go Back   Home > Forums > Member Areas > The Lounge

The Lounge A place to talk about almost anything but politics and religion.

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 11th December 2011, 07:49 PM   #18991
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Quote:
Originally Posted by StereoEditor View Post
It gives an easily grasped picture of how and if the amplifier's output impedance changes with frequency and whether the inevitable response changes with a typical speaker will be large enough to be audible or not.
Not only amplitude frequency response, but distortion as well. Sometimes we may have an amplifier with rugged multipair output stage, no output coil, almost no influence of load impedance to amplitude freq. response, and even if this is fulfilled the distortion vs. frequency may vary considerably with dummy load. It may reflect the driver (transistors) circuit design.
__________________
Pavel Macura
http://web.telecom.cz/macura/audiopage.html
  Reply With Quote
Old 11th December 2011, 07:57 PM   #18992
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by wayne View Post
As an old prof said measure! Measure! Measure! You had to bang the table with a red nut driver while saying it.
Right! Measure, measure, measure; but measure the things that give you an information, what to do in order to improve things!

Here is an example: the company measured amplifiers, and was doing well. It hired professional managers in order to do better. Managers divided profit by cost of assets and said that according to measurements the company needs to eliminate assets. Now the company has no assets, it's financial parameter measures excellent, but can't measure amplifiers because have no equipment. It has better performances, but has no future, because all that left from it is a brand name only...
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 11th December 2011, 08:04 PM   #18993
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by StereoEditor View Post
Amen to that thought, Nelson, with the proviso that there are some designs that would never fit any customer's needs!
John; Nelson's amps sound very nice, because instead of run for lower output resistance to satisfy your readers he carefully selects optimal load lines, to satisfy demanding listeners.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 11th December 2011, 08:23 PM   #18994
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Quote:
Originally Posted by john curl View Post
John A, I meant to challenge the inference that we were buying our reviews through placing ads in either 'TAS' or 'Stereophile' . Some people just imply things that have no justification.
Indeed, sadly, this is so. However in an open forum, there is no way to stop people posting their thoughts, regardless of how erroneous their thoughts may be. Also, some people wouldn't let themselves be confused with facts.
  Reply With Quote
Old 11th December 2011, 08:28 PM   #18995
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Quote:
Originally Posted by Wavebourn View Post
John; Nelson's amps sound very nice, because instead of run for lower output resistance to satisfy your readers he carefully selects optimal load lines, to satisfy demanding listeners.
Well, Nelson's amplifiers both sound great and measure well. As for the way they sound, I know first hand, for my power amplifier is a Nelson's product.
I assume there is much more to his designs than only selecting optimal load lines.
  Reply With Quote
Old 11th December 2011, 08:29 PM   #18996
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quote:
Originally Posted by john curl View Post
John A, I meant to challenge the inference that we were buying our reviews through placing ads in either 'TAS' or 'Stereophile' . Some people just imply things that have no justification.
I think you meant "implication," but, in any event, no-one implied that.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 11th December 2011, 08:36 PM   #18997
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by Joshua_G View Post
Well, Nelson's amplifiers both sound great and measure well. As for the way they sound, I know first hand, for my power amplifier is a Nelson's product.
I assume there is much more to his designs than only selecting optimal load lines.
I suppose, he uses proper power cable, right Joshua?
Edit: But it does not matter, actually: I suppose Nelson prefers satisfaction of listeners to satisfaction of readers.
__________________
The Devil is not so terrible as his math model is!

Last edited by Wavebourn; 11th December 2011 at 08:39 PM.
  Reply With Quote
Old 11th December 2011, 08:37 PM   #18998
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Quote:
Originally Posted by Wavebourn View Post
I suppose, he uses proper power cable, right Joshua?
An excellent point. Hurray!
  Reply With Quote
Old 11th December 2011, 08:43 PM   #18999
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by Joshua_G View Post
An excellent point. Hurray!

Sorry, Joshua. It was a friendly joke. The question was about frequency response measurement, if you would be so kind to go back and read what we were talking about.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 11th December 2011, 08:58 PM   #19000
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Wavebourn, don't you hear the difference in line cords?
  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 12:39 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