It makes good sense for stopping HF problems as well (SMD beads).
This whole 'ferrite is bad' thing was kicked off by the Oracle of Boulder who can also hear the difference between myrtle wooden blocks and some other kind on his cable lifters. There then followed a whole lot of wanabee GEB types who claim to hear the difference but decry the use of DBT to test their claims.
So, lets stop applying 'Bybee Science' and focus on solving engineering issues with engineering solutions.
Lets also recognize that no one on the planet can hear differences on things that are happening at -80dBV or more.
This whole 'ferrite is bad' thing was kicked off by the Oracle of Boulder who can also hear the difference between myrtle wooden blocks and some other kind on his cable lifters. There then followed a whole lot of wanabee GEB types who claim to hear the difference but decry the use of DBT to test their claims.
So, lets stop applying 'Bybee Science' and focus on solving engineering issues with engineering solutions.
Lets also recognize that no one on the planet can hear differences on things that are happening at -80dBV or more.
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> Lets also recognize that no one on the planet
> can hear differences on things that are happening
> at -80dBV or more.
At the same time let us remember that we can hear
any thing we can describe .....
AND !
Most importantly, there are multiple realities ....
> can hear differences on things that are happening
> at -80dBV or more.
At the same time let us remember that we can hear
any thing we can describe .....
AND !
Most importantly, there are multiple realities ....
"At the same time let us remember that we can hear
any thing we can describe ....."
Hmmm .... I am still pondering that one, as I contemplate the description of a unicorn! 😀
any thing we can describe ....."
Hmmm .... I am still pondering that one, as I contemplate the description of a unicorn! 😀
Listen for environmental clues.
There will be times when the natural world around you becomes aware of a unicorn’s presence, even when you cannot yet perceive the majestic beast. By paying attention to subtle sonic changes, you can increase your opportunities for spotting a unicorn. Practice keeping an ear out for:
•a sudden hush of crickets
•an emphatic hoot of an owl
•a rustling of oak leaves in a grove (if oak leaves are unavailable, elm leaves may be substituted in a 2-to-1 ratio)
•a bumbling of bees
•a sigh emanating from the brambles
•an improbable tinkling of wind chimes (see next chapter)
•a pause in a woodpecker’s hammering on an old tree trunk
•a whisper amid an autumnal harvest
•a melodious rumbling of thunder
•a snapping of twigs as small animals leap aside
•a whistling of the wind among the rocks
•a flatted fifth from an uninvited trombone
•a sizzling spark in the air when lightning bugs are absent
The unicorn pranced side to side. . . . Musical voltage chimed in the soaring spaces of the forest.
—A. A. Attanasio, The Dragon and the Unicorn (1996)
•a “crackling, papery sound—like the sound of a dry husk peeling from a bulb” (Carol Mason, “The Song of the Blue Unicorn,” quoted in Radical Honesty by Brad Blanton, 1996)
The following revelatory sounds may indicate that a noble unicorn is close at hand or just around a wooded corner:
•a nibbling behind a hedge in a leafy cloister
Hearing a noise a couple of feet away, Ruairidh threw himself behind a bush and peered through the leaves. The creature stood directly in front of his sight. He could see it bowing low and then moving its mouth as if it were talking, but he couldn’t make out any noise over the rumbling from above the clouds. Then the creature pranced away to his right.
—Sheona R. McCaig, Scrolls of Power (2003)
•a swoosh or swirl of air from a swatting tail
The unicorn was calm—neck arched, heavy tail swatting lazily at its golden sides, ears pitched forward as if it, too, were listening. —Peter S. Beagle, Immortal Unicorn (1999)
•a placid munching of sweet grass
The pure white unicorn was carefully munching at the bright green grass.
—Katrina Patton, A Journey into Imagination (2001)
•a blithe chortle echoing in a soft patter of rainfall
The unicorn whinnied like it was laughing.
—Gail Haley, Mountain Jack Tales (1992)
Afair, the ferrite 'thing' was already on a roll before the birth of the Avalon Eclipse.
(Wadia still uses them, but so does Goldmund, as a sock on the drain of power MOSFETs)
http://www.hifishock.org/galleries/electronics/mark-levinson/preamplifier/ml-1-2-mark-levinson.jpg
Are those the same parts on the resistors in front of the line driver modules?
Are those the same parts on the resistors in front of the line driver modules?
The one on the resistor in front of the red LED definitely is.
(as are the pairs on the top-left resistor of the phono boards)
(as are the pairs on the top-left resistor of the phono boards)
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Good luck, just as one can produce very favorable reviews from GEB audio reviewers of pre-amps full of 8-legs it falls on deaf ears so to speak.
Well I took three Fairite 43 material ferrite beads and three of the 73 material ones and ran a wire through all six. I then set my AP System 2 to 50 ohms output impedance on the BNC unbalanced output and used 1,000 ohms, 10,000 ohms and just the input impedance of the AP bnc input. I tested with .01 and 2 volts with IM distortion frequencies of 18,000 and 20,000 hertz at a 1/1 ratio.
Anyone with an understanding of magnetics and hysteresis care to guess the results compared to a jumper wire?
Anyone with an understanding of magnetics and hysteresis care to guess the results compared to a jumper wire?
Strange, my own experience is the exact opposite. I use ferrites on each and every cable in my system. Including power an speakers cables. And, if I am, sometimes, unable to listen differences with and without, i can always measure the improvements ferrites provide on distortion numbers and/or signal/noise ratios.
In the same philosophy that Richard Marsh was promoting, I try to use the fastest electronic assemblies I can. Able to deal with RF signals in a transprent way. (Including Current feedback circuits ;-). And limit as much as I can the bandwitches of the signals in their inputs as well as ground loops. Great care of the AC sens of each device, to minimize ground leakeages betwwen devices, once all plugged together, symetrical connections everywhere I can, shortest cables with good shields as I can.
But the ideal is digital optical links... 🙂
Depending on material used, there might be issues into 1k load and no issues to 100k load. I am not sure about 10k load - just my guess.
Pavel,
A well educated guess. Actually under all the test conditions except one, I found no change from just the jumper wire. At the 1 K load with 2 volts there was a spike at 16,000 hertz down by a bit over 100 dB.
Now to be complete I never did find the beads in the kit to do much in the way of getting EMI out of a system that had problems.
ES
well if you want to stop EMI you need to give it a lower impedance path out the way. So a ferrite on its own may not help. But of course you knew that!
Fingers of course are the best way of either coupling in or removing RF from circuits 🙂
when I were a lad in the lab we had a slightly out of spec batch of 7/16 RF connectors come in. You could change intermod performance by 30dB just by adjusting tightness a few Nm.
Fingers of course are the best way of either coupling in or removing RF from circuits 🙂
when I were a lad in the lab we had a slightly out of spec batch of 7/16 RF connectors come in. You could change intermod performance by 30dB just by adjusting tightness a few Nm.
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