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Thread: High “whistling” noise from my guitar/bass amplifiers in my home recording facility

  1. #51
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    Hi:
    I don't know if you are still having the problem, but if you are, try this-unplug your computer from the wall socket. If the whistling goes away, the problem is from the computer power supply, and sometimes installing a ground lift adaptor on the computer (NOT THE AMP) can solve this problem.

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    Whistling sound

    Hi: Sometimes a computer power supply can cause the problem you are describing. Try this--with the amp on and making the whistling sound, unplug your laptop from the wall socket. If the whistling goes away, the problem is caused by the computer power supply, and may be corrected by installing a ground lift adaptor on the computer (NOT THE AMP).

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    Quote Originally Posted by techplayer View Post
    Hi: Sometimes a computer power supply can cause the problem you are describing. Try this--with the amp on and making the whistling sound, unplug your laptop from the wall socket. If the whistling goes away, the problem is caused by the computer power supply, and may be corrected by installing a ground lift adaptor on the computer (NOT THE AMP).
    Hi and thank you for your feedback. I have tested that, I have tested everything, even stopped the power with the breakers in the whole house and left only one wall socket (so nothing else left connected to work)... with three different tube amps and different guitars, and different cables... and that "whistling" noise is always present. If I unplug the cable, it disappears.

  4. #54
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    Quote Originally Posted by ecc83 View Post
    Get those 1mH inductors. When you come to fit them, take the jacks out of the tin and please post pictures of the contact side of the jacks.

    I THINK you have it wired correctly but I cannot see for sure.

    Dave.
    So, I connected the new inductors, correctly (pictures uploaded) and... the "whistle" is still there even STRONGER! I even capture a radio station with one of my guitars when using a high gain on the amp!

    So, I did two other tests:
    1. I took one of my amps and a guitar out of my house with a long mains extension (20m) from my house and made a tour in my neighborhood around 3-4 houses away, in front, right and left from my house. The "whistle is always present EVERYWHERE" and especially when close to where the GAZ company dug last year to put the new installations (so it was not the electricity company). But the "whistle" augments also when close to the TV cable distribution boxes (they are in front of each house here).
    2. I also took my amp with a guitar to a friend's who lives in another area. There was NO "whistle" (like it was before in my house).

    My last hope maybe is to find a sort of a METAL flexible tube to put my cable in it and ground it which would work as a sort of "Faraday cage" and possibly stop that horrible "whistle".
    Attached Thumbnails Attached Thumbnails rfi-filter-new-wiring-1-jpg   rfi-filter-new-wiring-2-jpg  

  5. #55
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    Thanks for the chocs BD!
    cannot quite see from the left hand picky but it does not look as tho' the shield is going through the choke?

    Dave.

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    Just read about the TV Diss box!! THAT could well be amping up a local radio station. The RF amps SHOULD have sophisticated band stop filter but everybody does CHEAP! these days!

    Dave.

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    Quote Originally Posted by ecc83 View Post
    Thanks for the chocs BD!
    cannot quite see from the left hand picky but it does not look as tho' the shield is going through the choke?

    Dave.
    You're welcome Dave.
    You can open the filter and even unscrew the jacks to check if everything is correctly connected. I think so, as I precisely followed your drawing, but one never knows... I also measured each point after soldering and it all showed ok. Do you have another way for extended measuring?

  8. #58
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    Quote Originally Posted by ecc83 View Post
    Just read about the TV Diss box!! THAT could well be amping up a local radio station. The RF amps SHOULD have sophisticated band stop filter but everybody does CHEAP! these days!

    Dave.
    I have started an investigation with the 'Belgian Federal Posts & TV-distribution Company', I exposed the problem to them and I await a technician who will come and measure in my place and in the neighborhood. I also wrote mails to all neighbors and warned them that - as that emission of frequency is present in the whole neighborhood - it can be harmful for the health of our children, our youngsters and our own selves. Guess what, from +10 houses only ONE answered with concern!

    Anyway, I only hope the tech discovers what exactly it is, then possibly find a more sophisticated PRO filter as you mentioned before. Or maybe you might have an idea of such one?

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    Quote Originally Posted by ecc83 View Post
    ... ... ... ... but everybody does CHEAP! these days!

    Dave.
    Yeah... just a philosophical remark on that. We all and more sink in an "ocean" of a Financial Dictatorship led by a bunch of Invisible Dictators and their mindless puppets the politicians.

  10. #60
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    "Anyway, I only hope the tech discovers what exactly it is, then possibly find a more sophisticated PRO filter as you mentioned before. Or maybe you might have an idea of such one? " Well, I only know a bit of the RF stop measures I used years ago. Way back in the day we had TV diss amps in flats and hotels and they were housed in stout diecast boxes with copper braid bonding straps on doors. I notice these day the companies use PLASTIC cabs and of course the kids kick the ***t out of them.

    If you have one locally a "Ham Radio" club could be willing to help.

    Dave.

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