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Thread: Occasional hum

  1. #71
    Join Date: May 2012

    Location: Toulouse, France

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    I'm Kevin.

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    Quote Originally Posted by struth View Post
    phono leads especially and phono stages can produce hum, often fields from power cables etc.
    That is why I made some using a good quality coax cable, as advised by a respected phono stage designer.
    Kevin

    Too busy enjoying the music....

    European loan coordinator for Graham Slee HiFi system components..

  2. #72
    Join Date: Feb 2013

    Location: W Lothian

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    I'm Grant.

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    you do get current spikes in the USB cable. The USB cable has resistance, a small voltage is induced between the USB audio device and ground at the other end of the USB cable. This isnt much, but devices like phonos only generate a few thousandths of a volt, so it's plenty of signal to cause havoc if it gets back into the preamps.
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

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  3. #73
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 99,005
    I'm Grant.

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    good youve got culprit...
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    FIIO K7 BT, M11 PLUS, BTR7, KA5 - OPPO BDP-103D - PANASONIC UB450 - PANASONIC 4K ULTRA HD TV - PIXEL 6 - AVANTREE LR BLUETOOTH - 2* X600 SOUNDCORE - HEADPHONES INCLUDE, FIIO, NURAPHONES', FOCAL, OPPO, BOSE, CAMBRIDGE, BOWER & WILKINS, DEVIALET, MARSHALL, SONY, MITCHELL & JOHNSTON - 2*ZBOOK'S- MERCURY BD ROM, ROON, QOBUZ, TIDAL, PLEX, CYBERLINK, JRIVER - MULTI HDD'S -

    Oh my god! There's nothing wrong with the bidet is there?

    “Nothing discloses real character like the use of power. It is easy for the weak to be gentle. Most people can bear adversity. But if you wish to know what a man really is, give him power. This is the supreme test. It is the glory of Lincoln that, having almost absolute power, he never abused it, except on the side of mercy".

    “You see these dictators on their pedestals, surrounded by the bayonets of their soldiers and the truncheons of their police ... yet in their hearts there is unspoken fear. They are afraid of words and thoughts: words spoken abroad, thoughts stirring at home -- all the more powerful because forbidden -- terrify them. A little mouse of thought appears in the room, and even the mightiest potentates are thrown into panic.”

    "You don't have free will. You have the appearance of free will.”

    “There's a war out there, old friend. A world war. And it's not about who's got the most bullets. It's about who controls the information. What we see and hear, how we work, what we think... it's all about the information!”


    ***SMILE, BE HAPPY***

  4. #74
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 37,779
    I'm Martin.

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    I was just reading the other day about USB creating ground loops but I didn't think you were using one.
    Current Lash Up:

    TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.

  5. #75
    Join Date: May 2012

    Location: Toulouse, France

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    I'm Kevin.

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    I forgot it was still plugged in, to be honest. I do have one going from my PC to the DI, but that is fine.
    Kevin

    Too busy enjoying the music....

    European loan coordinator for Graham Slee HiFi system components..

  6. #76
    Join Date: May 2012

    Location: Toulouse, France

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    I'm Kevin.

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    It turns out that the USB cable was not the culprit, even though I thought it was.
    So, I bought an iFi iPurifier for the mains. It did nothing so I sent it back.

    Next up are some ferrite chokes on the SE cables. So far, so good, but I need some more time listening.
    It may still be there, but at a much lower level, which may be acceptable.
    Kevin

    Too busy enjoying the music....

    European loan coordinator for Graham Slee HiFi system components..

  7. #77
    Join Date: Jan 2013

    Location: Birmingham

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    I'm James.

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    You need one of these Kevin, it will probably cure all your noise problems. I heard one here the other day it was totally gobsmacking but so is the price!

    https://www.futureshop.co.uk/chord-p...caAnk-EALw_wcB
    Main system : VPI Scout 1.1 / JMW 9T / 2M Black / Croft 25R+ / Croft 7 / Heco Celan GT 702

    Second System : Goldring Lenco GL75 / AT95EX / Pioneer SX590 / Spendor SP2

  8. #78
    Join Date: Aug 2009

    Location: Staffordshire, England

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    Quote Originally Posted by Jimbo View Post
    You need one of these Kevin, it will probably cure all your noise problems.

    https://www.futureshop.co.uk/chord-p...caAnk-EALw_wcB
    I'd bet money it wouldn't.
    Current Lash Up:

    TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.

  9. #79
    Join Date: May 2012

    Location: Toulouse, France

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    I'm Kevin.

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    Quote Originally Posted by Jimbo View Post
    You need one of these Kevin, it will probably cure all your noise problems. I heard one here the other day it was totally gobsmacking but so is the price!

    https://www.futureshop.co.uk/chord-p...caAnk-EALw_wcB


    For 7k, I could rewire my house, and if you change the cable on the Chord, you can add another 1.5k
    Kevin

    Too busy enjoying the music....

    European loan coordinator for Graham Slee HiFi system components..

  10. #80
    Join Date: Jan 2013

    Location: Birmingham

    Posts: 6,772
    I'm James.

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    Main system : VPI Scout 1.1 / JMW 9T / 2M Black / Croft 25R+ / Croft 7 / Heco Celan GT 702

    Second System : Goldring Lenco GL75 / AT95EX / Pioneer SX590 / Spendor SP2

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