John Curl's Blowtorch preamplifier

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janneman said:



Welcome to the club 😀 ! The word 'I' in this context must have the most complex meaning of any word in any language....

Jan Didden


Yes.
I mean "I" as person, as an entity, with physical, mental emotional and spiritual faculties.
Thus, I'm glad and proud of the fact that I, as a person, am the one who determine my preferences.
I'm glad that there is music in the world, that I can listen to music and enjoy it, both live and reproduced, that I can choose my preferences of various music titles and choose my preferences of reproduction media.
 
Beg to differ. It shows that the ear does not determine the preference. As it should be.

So you suggest - if I understand correctly - that other factors sidetrack. I guess you mean appearance and other more emotional than rational impressions?

That's certainly the case with nearly every luxury product.

Have fun, Hannes
 
I don't know if I ever met, or talked to Lynn Olson, but I DID hear the WAVAC at the 2008 CES, completely by accident as I went down the hallways, looking at new stuff.
I had never read, or at least studied the review of the WAVAC, as I usually don't design with tubes.
However, the WAVAC was: THE BEST SOUND OF THE SHOW!
They played a vinyl record of Ella Fitzgerald, with the song: 'It is long long time, from May to September... ' and I just about cried! It was THAT good.
It was just like being there, using my brain to fill in any missing pieces.
This is what we are in the audio business for, folks! Not to sell you on some new 'thingy' or new paint job. This is what my associates get off on, when we are successful, not some fat bankroll to spend on women and cars, although I have worked for a few of them, as well, AND they have given the audio business a dent in its reputation, because of this.
Still, I am not wealthy, not that I work very hard, and all that I care about is making hi fi work as closely to the WAVAC demo as I possibly can, with solid state.
This year at CES 2009, WAVAC pulled back considerably, and demoed their second line of tube equipment. It was a mild disappointment, but LAMM, with their super single ended tube amp made my week, by giving the BEST audio performance at the CES. Yes, it was that good. This time, the CD player actually sounded better than the relatively hi end vinyl playback that they had. I think that I could do better with their phono playback, but I would have to throw just as much money at it, as they did with their CD playback equipment. No Sony or Radio Shack, here.
SEE, brand bias, source bias, even design bias, OUT THE WINDOW! What matters is the sound! When it is right, almost everyone will know it, and appreciate it.
 
Joshua_G said:



Yes.
I mean "I" as person, as an entity, with physical, mental emotional and spiritual faculties.
Thus, I'm glad and proud of the fact that I, as a person, am the one who determine my preferences.
I'm glad that there is music in the world, that I can listen to music and enjoy it, both live and reproduced, that I can choose my preferences of various music titles and choose my preferences of reproduction media.


I absolutely agree. Except that maybe I don't see a strong reason to be proud of these facts. I mean, it's just the way we were wired, it's not some personal special achievement .

Jan Didden
 
janneman said:



I absolutely agree. Except that maybe I don't see a strong reason to be proud of these facts. I mean, it's just the way we were wired, it's not some personal special achievement .

Jan Didden



I'm glad and proud of being human, with all takes, though I'm certainly not proud of all actions of all human beings. I deem it privilege to be a human.



janneman said:



Isn't ANYTHING we do basically emotional?

Jan Didden


Not really, not everything. That is, not everything we do is basically purely emotional. Our physical senses work, so is our mind and our spirit and sometimes few, or all, elements are involved, with varying proportions of the different faculties.
 
Joshua, you are debating people set in their ways. Please be careful, as they are very good at insulting you and debasing your education and experience.
The whole point of hi end audio is the EMOTIONAL EXPERIENCE.
If you don't get that, then you are just making expensive and exotic electronics to sell to rich people. Not everybody knows how to make products that create an emotional experience, at least on occasion, yet they will still try to sell something in the audio marketplace, depending on marketing to get them sales.
Unfortunately, many here, the DB types, are much of the reason that more audio equipment is not giving all that it could. The AES is responsible as well.
When people question their own ears, and others, to such a degree that they can rationalize every success as an accident and every failure as temporary oversight, nobody will try anything new.
For example, in autos, if the USA had some sort of huge trade wall against Europe and Japan, our automobiles would still be like the cars that we drove in the 1950's, with the handling and reliability of a 1955 Chevy.
It was only an influx of German cars for high speed handling and Japanese cars for long term reliability, did we learn about anything new. For the record, my cars are German and Japanese and have been for the last 18 years, European cars for the last 47 years. Yet, I once drove (and loved) American cars, I just found better.
It is the same in audio. IF you hear really good audio equipment, properly set up, it is a treat and a wonder. However, that does not mean that every audio store will have good sound, even with very expensive equipment. Many audio dealers are just as cynical as many here, and use other techniques to 'sell' their products. Many of my critics have heard examples of this, and not the 'wonder', and even if they did happen on a wonderful listening experience, they would blame it on their mood, the wine, or just an accident.
 
Joshua_G said:

I'm glad and proud of being human, with all takes, though I'm certainly not proud of all actions of all human beings. I deem it privilege to be a human.

Not really, not everything. That is, not everything we do is basically purely emotional. Our physical senses work, so is our mind and our spirit and sometimes few, or all, elements are involved, with varying proportions of the different faculties.


I can't disagree with this.

Jan Didden
 
john curl said:
When it is right, almost everyone will know it, and appreciate it.

Absolutely agree!
When people say, "Hey, I was confused, did he say that here at the table, or there from speakers playing record of his recent concert in this room?", and when they turn heads to the piano in the corner, when it is the recent record is playing, it is the best reward I ever had.
How well the sound fool imagination, is the core question.
 
janneman said:



If you have access to AES papers, it is paper # 7700 of the last (126th) convention. The author was a guy called Farina from I believe the U of Milan in Italy.

I was not impressed by the test itself - I believe that the ISO-31 multitone as used by AP is easier to use and more powerfull. There, you space 31 tones carefully so as to leave some FFT 'bins' open where the HD and IM products and noise fall, so you can analyse those later. I think 31 tones is pretty much equivalent to a music signal also.

The silence sweep is pretty difficult to generate, and involves a lot of MLS filtering, convolution and sophisticated digital processing. As I said, what impressed me was my (and others) ability to actually hear the missing tone!

Jan Didden

Jan,
I was thinking about this test and there is background noise generated in the cochlea and in the auditory pathways of the brain. White or Pink noise is just the sum of many frequencies and if you were to add a single frequency signal in phase with that generated in the white noise it would ride on top of the signal. If the added frequency was out of phase it would subtract or notch the signal, like in your test.

Frequencies that are out of phase with the background noise produced in our hearing pathways are also heard. I'm just speculating that this might explain why the sound was audible.

Does make any sense? Did they give an explanation for why the sound was audible in the test?
 
Being human was mentioned.

Please let me share with you.

A documentary TV show was just aired here.
It was about women who voluntarily go to hospitals to hug abandoned babies, who are left at hospitals, with good physical care, but with no soul in the world to give them love.

To me, this is the essence of being human.
 
Johnloudb said:


I'm not a recording engineer of course. Why should a recording need to sound loud and aggressive on CD? Marketing? I have some very good sounding CDs, like the now out of print Cat Stevens "Teaser and the Firecat" on Mobile Fidelity (Gain 2 System). The same recording in a reissued box set and a different label sounds bright and edgy. Anyway, it's unfortunate that the recording industry can't get it together.

Sony and Other music labels should phase out the CD and go to a an SACD or Blu-Ray audio format. I hope the CD continues its decline. Until then I'm buying LPs and SACDs whenever possible.



It's all in the mastering. Most CDs nowadays are mastered for the boombox and automobile crowd.

CD's that are mastered with the audiophile in mind can sound really great.

SACD is a technically far superior format to CD, but I believe that the biggest reason many SACDs sound better than CDs is that they were mastered with the audiophile in mind.

On the other hand, some SACDs were mastered the same old way, and sound like crap.

The biggest reason Vinyl sounds better to some is the different way it was mastered.

Cheers,
Bob
 
nicoch46 said:
John I ask you becouse I cannot find a good answer ,
were is the right place to jont the 0V ? after the shunt ,or fist or second caps ?

You should join points with the lower dynamic resistance between ground and rail pins. Near caps in this particular case. If caps have low values they have to be placed as closer to shunts as possible. But as soon as they are shunts, I suppose you are going to power preamps, so own RC thingies most probably will present on each board.
 
thanks Wavebourn, is dual mono psu for the driver stage of amp

the caps are 1000uf
this are half shunt
 

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