John Curl's Blowtorch preamplifier

[PMA]

I measured picked up HF noise on many cables. There is a big difference, and I have always considered change of sound as a result of different level and spectrum of picked up HF noise.

I have always considered difference in HF noise as a result of cable construction (geometry etc.) and dielectricum used, not 'superior SuperMonocrystal™ and Monocrystal™ copper (and silver) products' properties. Maybe I was wrong? 😉

 

[jacco vermeulen]

sneak into your wallet.

Xmas offer: buy a US4xs stereo set and get a Prada handbag for free.

 

[Wavebourn]

Perhaps some interesting reading.

http://www.ecossecables.co.uk/Tables/faqmainframe.html#fact

Thanks! I cried!

Even though it was very hard to cry so inaudible for my sleeping family...

🙄

 

[forr]

I measured picked up HF noise on many cables. There is a big difference, and I have always considered change of sound as a result of different level and spectrum of picked up HF noise.

I have always considered difference in HF noise as a result of cable construction (geometry etc.) and dielectricum used, not 'superior SuperMonocrystal" and Monocrystal" copper (and silver) products' properties. Maybe I was wrong? 😉

Hi PMA,



If HF noise picked up by cables has an influence on sound (I think it can), audio electronics should be made immune to it and some recipes applied to avoid its bad effects :

http://uk.geocities.com/cyrilb2@btinternet.com/download/measure_cables.pdf

 

[PMA]

Surely I know. Sometimes it is easier to say than to realize, and many designs go contrary to HF immunity rules.

 

[PMA]

Preamp THD 100kHz, into 50 ohm:

 

[lineup]

And here (about oxygen in copper):
http://www.diyaudio.com/forums/showthread.php?s=&postid=1583559&highlight=#post1583559

Anyhow, what about those component leads?
Lessee:
copper
tinned copper
silver plated copper
gold plated copper
cadnium plated?
rhodium?
and the above with steel, brass, etc??
solid silver, gold, etc...
--------------------

PS. glad someone mentioned that pesky "screen" wire in "directional cables"...

Douglas Self the prominent audio amplifier designer, the author of several books in Audio Amplifier making,
has done a severe testing project on Oxygene Free audio system:

PROJECT 8: THE OXYGEN-FREE LISTENING ROOM.

If oxygen-free copper is a good thing, then clearly oxygen is a bad thing for audio. The largest quantity of oxygen the sound is likely to encounter is in its passage through the air from loudspeakers to listeners.

The only way to address this is:
The Oxygen-Free Listening Room, which is filled with pure nitrogen.

😀 😀 😀 😀
Here an image of some of the test personel in action, listening:

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

Websource:
Mister Douglas Self - Projects related to Audio & Electronics

 

[fredex]

.........But of course. Nobody doubts that. Is that news for you?

Jan Didden

I could be mistaken but I get the feeling that some here believe that their ears are sensitive enough to hear any alteration to an audio signal.
The fact is, human hearing has limits, and there are real (measurable) differences in audio signals that no one can hear.

To get a better sound, knowing what you can't hear could be just as important as knowing what you can hear.

 

[PMA]

Which high rated audio product has Douglas Self designed?

 

[fredex]

He has a sense of humour, thanks for the laugh lineup 😀 😀 😀

 

[auplater]

Niobium cables?

Anyone ever tried superconductors for interconnects? Seems these could serve as a reference since the cooper-pair conduction mechanism could circumvent all of JC's residual resistance effects.

http://www.iop.org/EJ/article/1742-...quest-id=5ec73f5a-ebc9-4d38-b6ed-5018ab83ac22

Maybe even develop an amplification stage based on this:

cost might be somewhat of a factor, though...😉 😉

John L.

 

[PMA]

Or mercury - no domain boundaries.

 

[scott wurcer]

I measured picked up HF noise on many cables. There is a big difference, and I have always considered change of sound as a result of different level and spectrum of picked up HF noise.

I have always considered difference in HF noise as a result of cable construction (geometry etc.) and dielectricum used, not 'superior SuperMonocrystal" and Monocrystal" copper (and silver) products' properties. Maybe I was wrong? 😉

Yes, again file EMI & RFI pickup/sensitivity in factors not usually considered. One interconnect could "outperform" another based on this alone wrongly attributed to some other magikal property.

 

[Andre Visser]

I measured picked up HF noise on many cables. There is a big difference, and I have always considered change of sound as a result of different level and spectrum of picked up HF noise.

I have always considered difference in HF noise as a result of cable construction (geometry etc.) and dielectricum used, not 'superior SuperMonocrystal" and Monocrystal" copper (and silver) products' properties. Maybe I was wrong? 😉

I have compared their speaker cable, OFC vs Monocrystal vs Supermonocrystal and you can clearly hear an improvement in SQ with each step.

 

[gerhard]

Which high rated audio product has Douglas Self designed?

Professional mixing consoles for Harman-Soundcraft?

 

[myhrrhleine]

I could be mistaken but I get the feeling that some here believe that their ears are sensitive enough to hear any alteration to an audio signal.
The fact is, human hearing has limits, and there are real (measurable) differences in audio signals that no one can hear.

To get a better sound, knowing what you can't hear could be just as important as knowing what you can hear.

Sure.
But there are audible sounds which ou can hear, but may not realise it.
Some 'study' may have told you it is not audible, and you believed it.
It's like hearing below 0.1Hz
Most will say it can't be done. Yet many do hear that low.
They even make earplugs to reduce the loudness.

 

[Wavebourn]

Or mercury - no domain boundaries.

Yes, and it is used in relays and switches where domain boundaries play their role. It could help Parasound to be more reliable.

 

[PMA]

Gentlemen, some time ago, we analyzed here, with great support of John, distortion in JFET input stages (see my web page as well). Maybe we could move a bit to higher supply rail circuits.

 

[EUVL]

If I would be forgiven for interrupting :

Intriged by the folded cascode design of the Blowtorch, I had a search in the inet for some cascode and folded cascode variants, and wonder what the expert opinions might be:


Patrick

 

[john curl]

Does it work?