John Curl's Blowtorch preamplifier part III

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TNT

TNT

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These tails - do you believe there is something magic about them? Is there something special about their spectral composition? What makes them hard to reproduce?

What level do you estimate them to be on?

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Markw4 said:
Not clear that bits are being trucated exactly. Bit-depth related resolution of other sounds is still very good. I am still thinking about what could be going on. In a very speculative way I wonder if something in the S-D modulator is losing them because they are more stationary than other musical sounds. Maybe it sees them as something like drift offsets in the audio spectrum. To make that more clear, imagine a spectrogram view of music with reverb tails, where the tails can be visualized. They remain relatively stationary in the spectrum view with time according to the nature of how they sound, so knowing that maybe one could HP filter the spectrum to remove them as viewed in spectral domain. Just to be clear, I really am doing a lot of speculating at this point and probably need to do some reading to see if any of this could hold water.

Anyway, continuing with the story for now, it could be that jitter creates artifacts that causes the modulator to HP filter in the spectral domain. It does't necessarily have to be trying to go after the reverb tails directly.
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E

Evenharmonics

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chris719 said:
Well, you self admittedly don't know anything about digital. I am not sure why you would immediately blame it on the converter topology. Mark's explanation will not hold up to any sort of rigorous analysis.

Forgive me if, again, I do not trust in sighted listening tests performed by representatives of the most hearing challenged group in the population.
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But some do, deliberately. Why? As I mentioned before, they have dog/s in the race.
 
scott wurcer

scott wurcer

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jneutron said:
Any links providing any content? Peer reviewed papers, publications, conferences, anything?
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You need to check with the folks that used to chip cars in the 70's to beat emissions. I think Dick Sequerra still sells spark plugs, cars and audio go way back. BTW I've tried the search before and only found sales offices in countries that are on the DOD "do not ship any technology here" list. They are not kidding and the penalties are not funny, a neighbor in the next office park was raided by a SWAT team in full gear.
 
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john curl

john curl

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What Jack Bybee does today is more 'confidential' than military. I presume he still sells his former products from as far back as 25 years ago, but his really good stuff in made in a very different way, and that is what I am using now, and Jack is experimenting with it for other applications.
Actually you don't know his proper name: It is John Jack Bybee Now do a patent search.
 
john curl

john curl

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I would guess most were classified. However, lately, he and Mike have patented several ideas. This is the mighty trio, Jack, Mike, and me:
 

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simon7000

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hhoyt said:
Hey Bill,
I agree; I thought Ed said once per blue moon, once again I am guilty of not reading carefully. I typically burnish/preserver patch cables once per year or two which works well for me. If one lives in a humid and corrosive atmosphere like a seaside home, more frequent may be warranted.

Howie
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I can measure a change at about the two month mark, so my sense of good practice says doing a bit every month should keep it below that threshold. Of course we have a bit of sulfur in the air from the coal fired power plants in Ohio. (The wind here mostly comes from the west.)

I do see a result from just the application of the semi-magic solution but it does seem to take a few hours.

As to reversing the loudspeaker cables, I would prefer to let a few folks try it on one channel and compare it to the un-swapped one and comment before I mention what I think changes.

The bit about the double stick tape is one that really works for me on large projects.

But let us face it, it is more fun to argue about things esoteric than it is to actually exert the effort to try anything.
 
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benb

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scott wurcer

scott wurcer

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simon7000 said:
But let us face it, it is more fun to argue about things esoteric than it is to actually exert the effort to try anything.
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I've tried a few over the years, cable lifters, etc. even paid my own money for a Bybee nothing nada and the Bybee even made explicit claims the the picture on any monitor (even cheap ones) would be dramatically improved.

I did have a cable that sounded off recently, it turned out the shield connection had broken off. I think the problem in the lab is that most things are gold on gold for serious equipment, otherwise I could repeat that this stuff never reared its head in my 42 years, amps to femto-amps, volts to nanovolts.

BTW it was you that asked one of the Bybee threads be closed, 8 years ago almost to the day. We have not progressed far in that time.
 
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