John Curl's Blowtorch preamplifier part II - Page 2714 - diyAudio
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Old 2nd September 2012, 06:08 PM   #27131
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Quote:
Originally Posted by john curl View Post
I'm amazed with myself. How do I get these 'chimp' reviewers to give me A ratings on most, but not all of my designs?
Hi John,
Do you really mind those who envy you?
Do you really mind those who think they can design and build a preamp that measures well (may be an OpAmp based one) and think that it will sound as good as the best of your designs?

I don't mind at all those who are smart in their own eyes, they only make me laugh.
I know from my own experience that there is no necessary correlation between published measurements results and sound quality. No one's words will make me deny my own experience.
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Old 2nd September 2012, 06:12 PM   #27132
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I wouldn't know. Have you looked in catalogs and data sheets? Or did you mean to direct that question to someone else?
Originally I asked Scot Wurcer. Since you responded, I also asked you. I get your reply that you wouldn't know.
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Old 2nd September 2012, 06:35 PM   #27133
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Originally Posted by john curl View Post
I'm amazed with myself. How do I get these 'chimp' reviewers to give me A ratings on most, but not all of my designs? Parasound does not advertise anymore in the big mags.
I, at best, talk to one of the major magazine editors perhaps 5-10 minutes, once a year.
The last time I called the editor of TAS, he didn't return the call OR do me the favor of sending me a couple of extra copies of a specific issue that had my designs in it, more than normal.
I wish that I could find what I do have, unless it is an ability to design a successful audio product, to win friends and influence people. '-)
Mr. Curl, I don't know you, nor you me, and can only percieve so much by your writings. I am trusting that you are being playfully sarcastic, which is a style all it's own if you will. I trust the tinges of bitterness and unhappiness is what we ignorant inbred rednecks in the south call "poor mouthing".

Looks to me, as a newcomer, that you have a lot of people on here paying you a lot of respect...respect, I might add, that I can assure you that the end purchaser of the commercial gear you designed will not even consider.

I am guessing you are aware of this.
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Old 2nd September 2012, 07:06 PM   #27134
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Originally Posted by Joshua_G View Post

I've never heard the CTC Blowtorch (nor any other design by JC).
I heard Halo JC-1, Halo JC-2, Halo A21, but never heard CTC Blowtorch. JC-1 and JC-2 are very good amplifiers, but definitely there are another designers and manufacturers who also offer very good amplifiers. Regarding A ratings in Stereophile, one can see very different topologies that all were A rated.
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Old 2nd September 2012, 07:09 PM   #27135
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Well, aeronautical, I wish that I was rich, like many of my colleagues. But alas I am not bent to be a good businessman, and I just get along. What I DO, however, is to keep up on audio design the best way that I can. This takes my time and extra income, and it is a worthwhile avocation as well as major interest.
I have my opinions as to what it takes to make truly excellent audio equipment, and usually when it gets to the marketplace, my designs are accepted to be amongst the best available. That is all that I care for, and all that I get, except for a retirement income, barely covering my expenses.
Now, when I attempt to convey my personal experience as to what works in audio design, unfortunately a number of 'critics' tell me that I don't deserve to be taken seriously, because in their opinion, my successes are illusionary and really just fanciful product puffery. It gets old to not be able to express my personal opinion here on this thread, without being undermined by some critic of audio listening, itself. After years of this, I do grow tired.
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Old 2nd September 2012, 07:14 PM   #27136
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PMA, I noticed that you omitted the A21. I have never listened to one in my system, it just sits in the hallway, waiting to be tested. Give my your frank, professional opinion of that amp. I trust your input.
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Old 2nd September 2012, 07:55 PM   #27137
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Originally Posted by PMA View Post
I heard Halo JC-1, Halo JC-2, Halo A21, but never heard CTC Blowtorch. JC-1 and JC-2 are very good amplifiers, but definitely there are another designers and manufacturers who also offer very good amplifiers.
There is no doubt in my mind that there are other good amplifiers. (The power amp in my setup is produced by Pass Labs).
As I wrote above, which amplifiers one would prefer over another one, it is also given to both budget and personal taste and preferences.

It seems to me that for preamplifiers, FET's (the proper ones) are preferred over BJT's, possibly also tubes are also preferred over BJT's.
Also, no capacitors in the signal path is the highly preferred option alas, usually impossible in tube amps (unless one goes for highly complicated circuits, which is a drawback in itself).
Also, minimum count of active (amplifying) parts is the highly preferred option.
Also , no GNFB is the highly preferred option.
Also, high open loop bandwidth and high slew rate are the highly preferred options.

All the above are found in the CTC Blowtorch simulations, or approximations, that were shown in this thread.

On top of that, the case and passive components, including the wires, have impact on sound quality. I know it also from my own experience, not only because of JC and others said so.

All the above are the reason I have such high regard to JC and some of his designs, though I heard none. It makes sense to me.

Again, I know for a fact that there are other good designs (some of them abide in my setup). So, yes, JC isn't the only excellent audio designer out there, though, in my mind, he is on the first raw of not too many.

This being a DIY audio forum, some of JC's designs (along with some others designs), are inspiring and are doable by DIY'ers, (doable at least to some degree).
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Old 2nd September 2012, 08:00 PM   #27138
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Quote:
Originally Posted by john curl View Post
Well, aeronautical, I wish that I was rich, like many of my colleagues. But alas I am not bent to be a good businessman, and I just get along. What I DO, however, is to keep up on audio design the best way that I can. This takes my time and extra income, and it is a worthwhile avocation as well as major interest.
I have my opinions as to what it takes to make truly excellent audio equipment, and usually when it gets to the marketplace, my designs are accepted to be amongst the best available. That is all that I care for, and all that I get, except for a retirement income, barely covering my expenses.
Now, when I attempt to convey my personal experience as to what works in audio design, unfortunately a number of 'critics' tell me that I don't deserve to be taken seriously, because in their opinion, my successes are illusionary and really just fanciful product puffery. It gets old to not be able to express my personal opinion here on this thread, without being undermined by some critic of audio listening, itself. After years of this, I do grow tired.
Thanks for the reply Mr. Curl,

Although off topic I agree I would more than likely be jaded as well.

When I was in my early twenties I observed to my mentor that is wasn't fair that those who apply their knowlege are often building wealth for others...wealth that we don't share in proportionally. His answer was that "as unfortunate as it is, those who know how work for those who know why". That is a tragedy of society that I'm sure is shared by countless engineers on the site.

I can't fix that Mr. Curl but what I can do is to publically acknowlege your worthy contributions, whether they were properly rewarded or not, and I invite others do do so with me.
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Old 2nd September 2012, 08:03 PM   #27139
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Originally Posted by john curl View Post

Now, when I attempt to convey my personal experience as to what works in audio design, unfortunately a number of 'critics' tell me that I don't deserve to be taken seriously, because in their opinion, my successes are illusionary and really just fanciful product puffery.
Hi John,
I haven't heard any good audio product from any of your critics.
The very good sounding audio products I heard were designed by designers who say very similar things to what you say.
I let the critics criticize, while I let the good designers design.
In the end, what gear sound very good to me have nothing to do with what people say.
Writing on the internet is free.
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Old 2nd September 2012, 08:08 PM   #27140
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Originally Posted by aeronautical View Post

I can't fix that Mr. Curl but what I can do is to publically acknowlege your worthy contributions, whether they were properly rewarded or not, and I invite others do do so with me.
This is true and honorable on you part.
It will not stop those who may be envy and those who John's knowledge and experience undermine their preconceived notions bout audio and audio gear.
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