John Curl's Blowtorch preamplifier part IV

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Speaking of cars, Peter Evans came over with Ford Mustang with 540HP and 4 straight exhausts. What a rumble!

😀 John, You know I always had interest in cars. My CTS-V had 650/650. Very hi-po. FUN I do miss driving.

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-RNM
 
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“Secondly, Richard Marsh is right. Most input here is just small talk, and most here are not very informative in a useful way to improve audio quality. Real engineers like 'tricks and tips' on how to do something better.”

There you again JC. Talking down to everyone.

What do you expect? JC tell all his known how to design a audio product? I think he has design philosophy but he do not want to share it. But I can learn the schematic and maybe found about 80% of his design philosophy 😀

Small clue can be help. Of course, I do not believe it, until I prove it my self.
 
We can measure the difference between 192/24 vs 44.1, but can we hear it ?
We can measure the difference between 1ppm and 10ppm distortion, but can we hear it ?
The answer to both question is most probably no.

If you listen sine wave then I agree. But music is not sine wave. The problem sometime only happen at certain condition.

In my experience, when I demo my amplifier to my friend who a sound engineer, he use his mix, an edm music. After heavy bass, at several second he told me that the sound is not right. It is below clipping. My other amplifier can reproduce it correctly. He admit that my amplifier that have a problem is better sounding at other song. More detail, although the different is subtle.

When it related to dynamic, it is difficult to measure. How do you measure of temperature modulation that happen at specific situation? You can read a book with title "Audio Power Amplifiers" by Dr. Arto Kolinummi Chapter 3. Sources of Dynamic Distortion.
 
I think that Peter's car is a Shelby Mustang. Of course Peter has had many cars.
I mentioned Peter's car because it has that amazing switchable exhaust. I prefer other cars, myself. Peter has a pretty nice hi fi as well, tri-amped with tubes on the top 2, and a Nelson Pass Xover.
 
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Of course many people care, because there is many people enjoyed my design.
You can be jealous, you should....

You jealous again. Go to school, kid. You should learn something and then do something that you can proud of it.

But I can learn the schematic and maybe found about 80% of his design philosophy


Dear Bimo, if you are going to be such a pompous fu smack master full of bombastic braggadocio about your audio amplifier designing skills and what not, maybe it's time to try mimic real Master's other qualities as well, such as humbleness, but so far you come off mainly as an extremely narcissistic and petty person standing on a pedestal reaching far above the clouds who gets a perverted kick of being (in your imagination) envied and praised for by others.
The rest of us challenged commoners have to suit with barely being able to "decrypt a mere 20(?)% of jc's sauce" and sticking around "mediocre audio", but don't let me discourage you from trucking on with your testosterone filled teenage talk, there's an arfy audience of maslow chimps who probably finds your verbiage filling a very important function, got to let hooligans in need for a group belonging have a camp to stick around, the football game itself is of less importance.
 
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Dear Bimo, if you are going to be such a pompous fu smack master full of bombastic braggadocio about your audio amplifier designing skills and what not, maybe it's time to try mimic real Master's other qualities as well, such as humbleness, but so far you come off mainly as an extremely narcissistic and petty person standing on a pedestal reaching far above the clouds who gets a perverted kick of being (in your imagination) envied and praised for by others.

Who is humble here? Even JC is narcissistic 😀

If someone polite to me, I will polite to him.
 
This has something to do with my post you quoted? Ah, of course, in your opinion and readers know that you are biased for your audio business.

Could be that you've to read some introductory books about hypothesis testing before, but you surely will know then what my post "has to do" with your post.

Hint," false negatives" are part of the "playbook" of hypothesis testing, "false positives" as well....

@Syn08,

Yes, your very own, private POV; as far as I recall, short of some misunderstandings due to loose control of the discourse, nobody said here that "no audible differences should exist". Do I need to say "FUD" again?

You know, information is lost without considering the context. I was talking about the "Great debate" and the agendas that seemed to play an important role. Unfortunately this lead to the bad name that controlled listening tests have among a lot of audiophiles.

<snip>

2. We don't give a hoot if there are two persons in Myanmar that can hear X; there are people known to be able to see Mars satellites Deimos and Phobos bare eyed, so what? It's the psychoacoustic researcher duty to prove his results are of relevance and to specify the scope of the population it applies to.

Who is "we"?
Is it a group of people (for example) who praised M/M while trashing Oohashi et al.?
It is the same set of requirements it is a fair game, but quite often it seems as there is a very different set that depends on if "they" like the results.

It is not surprising that people don't like to participate in this.......
 
Last time I purchased some TO-92 bipolars to try it was 50K late at night but they were cheap. We have more Toshibas than that in multiple undisclosed locations.(really) I wish we had gotten more. Nelson has never scolded me for buying parts.


That seems very sensible given the tosh parts are you lifeblood. For those of us without such a stash we just have to work with what is available now.
 
That seems very sensible given the tosh parts are you lifeblood. For those of us without such a stash we just have to work with what is available now.

I have a small stash (1000+) of BF862. When I heard NXP were transferring the fab, I asked the guy that runs the product line and he told me they weren’t transferring BF parts so a got about 50 samples and then bought the rest from Mouser. BTW these things were still being made on 4” wafers - it was in the RF fab and once they got the process right they did not touch it for years. RF small signal is a different world even in semis!

I’m more of an opamp guy for small signal to be honest (other than MC). OPA1641 looks like a cracking part to my mind - the JFET input OPA’s have come along leaps and bounds the last few years.
 
Of course, I'm narcissistic, with all my accomplishments in audio design, who would not be? '-) Bill, I am not impressed with your attitude. Can't you think of anything constructive to say?
Hey guys, Parasound is releasing my latest amp design. I hope people like it, it is too expensive for my budget and room size. Peter Evans, with his tube power amps and solid state bottom end, probably has the best listening set-up of just about anybody.
For those of you who don't know, Peter Evans once headed an audio company that made quality tube audio equipment. I especially liked his tube preamp, but that was 30 years ago. I think that it sounded better than the JC-80 that I had designed a few years earlier, as I recall, and that would beat just about every IC based preamp ever made. Peter gave up the company, because he lost too much money per month keeping it going. Oh well, that's audio for you.
 
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