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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 11th December 2011, 07:49 PM   #18991
PMA is offline PMA  Europe
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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.
 
Old 11th December 2011, 07:57 PM   #18992
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John Curl's Blowtorch preamplifier part II
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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...
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Old 11th December 2011, 08:04 PM   #18993
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John Curl's Blowtorch preamplifier part II
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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.
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Old 11th December 2011, 08:23 PM   #18994
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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.
 
Old 11th December 2011, 08:28 PM   #18995
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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.
 
Old 11th December 2011, 08:29 PM   #18996
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John Curl's Blowtorch preamplifier part II
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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.
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Old 11th December 2011, 08:36 PM   #18997
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John Curl's Blowtorch preamplifier part II
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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.
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Nothing in the universe is perfect. The ideal things are the ones that are most optimal. Optimization criteria, what matters. When I hear "No Compromise Design", I want to take a sledgehammer and test how impact-proof it is.

Last edited by Wavebourn; 11th December 2011 at 08:39 PM.
 
Old 11th December 2011, 08:37 PM   #18998
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I suppose, he uses proper power cable, right Joshua?
An excellent point. Hurray!
 
Old 11th December 2011, 08:43 PM   #18999
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John Curl's Blowtorch preamplifier part II
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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.
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Old 11th December 2011, 08:58 PM   #19000
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Wavebourn, don't you hear the difference in line cords?
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