John Curl's Blowtorch preamplifier part II

Status
Not open for further replies.
My only point was that line contact stilii are not chiseled down as sharp as a cutting stylus or they would destroy the LP. "The math" involves a lot of mechanical constants not usually published, and as JC said the sonic loading effects are not due to this damping but the usual anecdotal listening tests by the GEB.

Of course they would destroy the LP. Supersharp Styli do that really somewhat.
There is a well known brand, advertising his styli are nearly like a cutting stylus, thus sounds better.... what a crap ,reading his homepage is nearly as funny as reading *Mad*Magazine.
Thats why i use a spheric tip, tracks 20 khz easy, sounds closer to the master tape and prevent damage.

Would like to know what makes the audible difference, if it is not the damping??

Lower ohms make duller (and can reduce output), higher ohms make brighter, sometimes zippy and it has influence in soundstage presentation.
 
There is a well known brand, advertising his styli are nearly like a cutting stylus, thus sounds better.... what a crap ,reading his homepage is nearly as funny as reading *Mad*Magazine.

An externally hosted image should be here but it was not working when we last tested it.


However these days, I think this would be a more appropriate title.

An externally hosted image should be here but it was not working when we last tested it.


:D

se
 
For a 'dying' art or avocation, you people sure work overtime to trash any effort to get better fidelity from existing audio systems. IF you had attended the latest CES, and SHOW, and found NOTHING of interest or value, I could understand it. But were ANY of you there? How about Rocky Mountain? Anybody?
 
You do love repeating that we are all in error. If the cable makes your amplifier oscillate at 50MHz some will say you can't hear 50MHz so it doesn't matter who's right? And yes this did happen at a listening test and the difference was not obvious.

I am certain that there are audiophile speaker cables manufactured with such high shunt capacitance and poorly designed solid state amplifiers that are so unstable that the combination will form a tank circuit that will send the amplifier into spontaneous ultrasonic oscillation. There was one after market speaker cable manufacturer whose products were famous for doing just that. They didn't merely distort the sound, they sometimes destroyed the amplifiers they were connnected to.

No such problem with my supplier's speaker wire though. I've never heard even one complaint like that about Home Depot.

BTW, what makes you think I enjoy telling you when you're wrong?
 
BTW, what makes you think I enjoy telling you when you're wrong?

What makes you you think you ever told me I'm wrong? Don't labor under that misconception. Please recall the posts. An unqualified statement that the impulse/transient reponse of a system and frequency response are duals is wrong, and you said it. This is only true of causal, time, and scale invariant systems, at the detail level very little in audio besides cables are. Apply a 10000V volt impulse to a speaker and see if it's just louder than a 10V one.
 
Last edited:
more from John please

While the difficulties in evaluating one's own (and other's) subjective experience is a marginally interesting topic, I'm actually interested in learning what decisions John has made in his products, and what design principles he has derived, based on HIS subjective experiences and the reported experiences of those he trusts. ( I’m also interested in the straight forward engineering decisions.) As with any conversation, I'm willing to mentally add the phrase "in my experience" or "in my opinion" to any statement that requires it, without destroying the flow of the conversation with a tedious and critical epistemological debate.
 
Were you there THIS YEAR? Because what we are talking about NOW is AUDIO TODAY.
Even IF you WERE at CES this year listening to the BEST demos, and were completely unimpressed or bored, then audio, beyond what you have now, is NOT for you, and you should find some other subject to concern yourself with. There must be SOMETHING that is considered exciting and important to many people here.
 
I've been to quite a few CES, showed at some as well. Never heard anything at any of them that matched what I've heard in people's homes. But I suppose, like Charlie Brown kicking the football, THIS year was different.:crazy:

edit: Most impressive demo I've ever heard at CES was the old MBL watermelons. Lots of nice-but-not-thrilling demos otherwise. One very funny experience with someone using magic hockey pucks.
 
Were you there THIS YEAR? Because what we are talking about NOW is AUDIO TODAY.
Even IF you WERE at CES this year listening to the BEST demos, and were completely unimpressed or bored, then audio, beyond what you have now, is NOT for you, and you should find some other subject to concern yourself with. There must be SOMETHING that is considered exciting and important to many people here.

And what REALLY was different at this show compared to last year's show? Or say even the show ten years ago?

Just what "problems" were solved or improved upon in any meaningful way? Or for that matter, just what "problems" currently exist that need improving on beyond a marketing numbers game?

se
 
This year at CES and The Show, a great deal of emphasis was placed on vinyl reproduction and vacuum tubes. In fact, MOST of the best exhibits had both, no matter what the quality and cost of the loudspeakers were. This was a departure from many earlier shows, as many exhibitors tried to eliminate vinyl, as the software was limited, and consumer interest was low, as everyone had predicted that digital would completely take over, especially by now. Well, that attempt backfired, and vinyl is back, bigtime, with the natural reproduction that it can give.
However, for many, who have given up on vinyl, and probably never got beyond a Grado or a Shure cartridge with an inexpensive Japanese turntable would never know the emotional content of a simple song, that only vinyl or analog mastering recorders can convey. Yes, it is expensive to do right, especially when customers want a quality fit and finish as well, but it can be worth it to the limited few who can afford it, and a joy to design an all-out audio product. This is only MY opinion, but I am really glad as a retired man in my late '60's that I can get so much from listening to a competitor's product, as well as my own efforts. Like comparing fine cars or other quality items.
 
a little churlish Steve...

Thanks for the interesting insight John. Reading between the lines I think i see the thrill of creating art in your comments, is that a fair assessment? That would explain (for me) the approach you have to the improvement process - the ultimate reliance on your senses. Not unlike a visual artist who relies on their appreciation of colour and form to generate art.

Again, i hope i'm not missing the point by too much here. Thanks!
 
It is MORE than art. It is engineering 'excellence' or whatever approach that conveys the 'emotion' of a musical experience, even if the 'artist' is no longer with us.
Measurements showing lowest distortion, for example, do not NECESSARILY convey everything that makes an audio product to work well to give true sonic satisfaction.
In fact, some 'accurate' electronics can sound 'cold', boring, or 'homogenized' . These are 'subjective' evaluations that are 'everything' to audio success.
Many attribute it to arbitrary factors, but I think is is overlooked factors, not yet easily measured with test equipment made with the same electronics that we have already found wanting. After all, if whatever we are detecting were easy to measure, the test equipment residual would be very high, because IF I imported my test instrument front end into my hi fi system, I know from experience that I could hear it, and it would sound 'homogenized'. Why do I know? Because I tried it. It would surely simplify my task of making world beating audio equipment, but the cost is pretty high, sonically, unfortunately. That is why I worry so much over IC op amps, I have been trying them for the last 45 years, hoping to substitute them for discrete fet or tube designs. So far, just barely, for my cheaper stuff. That is a good part of what I have been doing over the past year, evaluating IC op amps in my standard circuitry and hoping for the best. It never ends with a true favorite, because all are flawed (so far) in some way.
 
Status
Not open for further replies.