John Curl's Blowtorch preamplifier

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#12,081
scott wurcer said:


It has been stated repeatedly that there are any number of reasons for two cables to sound different. The steadfast refusal of some audiophiles to even explore these is a recurring disappointment. Does a cable you dislike make your favorite amplifier oscillate? I don't care or it doesn't matter are not appropriate answers.

I once joined a writer for a major audiophile mag for an evening of listening and noticed that loud bass notes dimmed his lights a little. He commented that the entire living space was on one 15A fuse. Do you think his cable or power cord reviews were worth anything?
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Scot,

It seems to me you underestimate my listening condition and my scrutiny.
If you will happen to be around – you are invited.
 
#12,082
SY said:


I don't know if AudioXpress has published the articles on the web; you can certainly look on their website and see if of them are there. If not, they do sell back issues. It's a very worthwhile publication, so I'd highly recommend dropping a few shekels for the education and to support a very worthwhile organization. The previous link to Walt Jung's site may also pay dividends.
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I don't mind few Shekels, I don't mind even few hundreds of dollars.
Please quote the relevant issue.
 
#12,088
Joshua_G said:



Scot,

It seems to me you underestimate my listening condition and my scrutiny.
If you will happen to be around – you are invited.
Click to expand...

I think you are still missing a point, your scrutiny is limited if you have no interest in some disciplined engineering practice. Unguided cobbling together of devices based on intuition and "what feels or looks right" has its limits.

It only takes a few modestly sophisticated measurement to eliminate most amp/cable/speaker interactions. You are not alone, I have come across many listeners from non(less)-technical backrounds that are downright hostile to getting "down and geeky". Not to say you are but my impression is that you are pretty much a plug it in and decide by listening alone guy.

Some might think a 1000pF/foot cable is "well engineered" and some may not.
 
#12,090
scott wurcer said:
............I once joined a writer for a major audiophile mag for an evening of listening and noticed that loud bass notes dimmed his lights a little. He commented that the entire living space was on one 15A fuse. Do you think his cable or power cord reviews were worth anything?
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I enjoyed that. A lovely story.
 
#12,091
john curl said:
Joshua_G, they are 'unbelievers' and 'unlisteners' so please don't try to convince them of your own experience. It is important to walk a fine line here, and not provoke the pitchfork wielding villagers. I have to do it, myself.
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John

Do you really mean what you are saying here?

If you do I’m very disappointed.

And it makes me feel a bit sad.

Stinius
 
#12,092
If this thread were a movie I'd say it captures perfectly the very essence of the human condition in community, the highs, the lows ...... and the midrange are all perfectly portrayed, and as the plot slowly unwinds we can do nothing but post and wonder just where will it go next?
 
#12,093
gerhard said:


There is an additional load assumed to be in par. with the cap.
That's the circuit that has to be powered.

The cap itself is contra productive because it resonates with the
output of the op amp that is usually inductive. This challenges
the op amp's stability. A _small_ capacitor directly across the load
might help, however, at high frequencies where the op amp
runs out of steam. It may have to be isolated by a resistor, which
is not welcome in a power supply.
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Gerhard,
I don't know the particular circuit you and syn8 were talking about. So I'm still lost.
Do you have a link? 😱
regards
 
#12,094
I believe in wire differences that can't be easily measured. It is part of my personal experience and many of my colleagues over 3 decades. I don't push it much, because I personally don't know why these differences exist, except that I know better than to just ignore them. Your experience may be different, but I wish that it would not be brought up to a confrontational level on this thread.
 
#12,095
john curl said:
I believe in wire differences that can't be easily measured. It is part of my personal experience and many of my colleagues over 3 decades. I don't push it much, because I personally don't know why these differences exist, except that I know better than to just ignore them. Your experience may be different, but I wish that it would not be brought up to a confrontational level on this thread.
Click to expand...

John

That’s ok with me, but could it be a JC thread and not a JG thread.

I’m only talking for myself but I think there is a lot of member’s that really admire your work and would pay attention if you would come up with some advice and solutions.

You know that I don’t agree with everything you’re writing, but “hey” try to convince me then, and if everybody agreed in everything it wouldn’t be a discussion and everything would be statues quo. That said, I do have a lot of respect in you and your work, but I don’t crawl.

Stinius
 
#12,098
john curl said:
I believe in wire differences that can't be easily measured. It is part of my personal experience and many of my colleagues over 3 decades. I don't push it much, because I personally don't know why these differences exist, except that I know better than to just ignore them. Your experience may be different, but I wish that it would not be brought up to a confrontational level on this thread.
Click to expand...

John, herein lies the difficulty for those of us that are of a more analytical persuasion.

By calling upon "differences that can't be easily measured" without stating what they are or what makes it difficult (although I note you didn't say impossible), you call upon 30 years of personal experience and many colleagues without any indication of who they are or what the experience is of, so it remains anecdote and unsubstantiated opinion, you state you do not know why these differences exist yet 30 years should have been enough to have allowed you to come up with something, or perhaps you have given up and just dropped into the "its all magic" school of thought ?

I have lost track of how many of your posts attempt to persuade by including a simple reference to how long you have been doing this and unnamed people you call upon as having spoken to, worked with etc, but to make it credible it needs details.

All this unsubstatiated opinion, and stating anecdote as fact is the sort of stuff we don't need in a forum thread that purports to discuss ways to advance the state of the art. It is not logical thought and without that we will not have progress.

OTOH it is entirely reasonable for you to simply select your system based on how it sounds to you, but that in no way means it is a faithful reproduction system.
 
#12,099
stinius said:
..........I’m only talking for myself but I think there is a lot of member’s that really admire your work and would pay attention if you would come up with some advice and solutions.....
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Maybe it's only me, but I have the impression that not all are reading the same into the posts of John. In this thread as well as in many other posts, John came effectively "up with some advice and solutions".

It's just a pain in the a... to read up the whole thread now.
There are also some other sources, if this escaped you:
John Curl

Tino
 
#12,100
scott wurcer said:


I think you are still missing a point, your scrutiny is limited if you have no interest in some disciplined engineering practice. Unguided cobbling together of devices based on intuition and "what feels or looks right" has its limits.

It only takes a few modestly sophisticated measurement to eliminate most amp/cable/speaker interactions. You are not alone, I have come across many listeners from non(less)-technical backrounds that are downright hostile to getting "down and geeky". Not to say you are but my impression is that you are pretty much a plug it in and decide by listening alone guy.

Some might think a 1000pF/foot cable is "well engineered" and some may not.
Click to expand...


Please let me get you right.

Do you claim that all differences between different cables are measurable?
 
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