1. Win a Broadcaster or one of 3 Teles! The annual Supporting Member Giveaway is on. To enter Click Here. To see all the prizes and full details Click Here. To view the thread about the giveaway Click Here.

Strange Noise In All my Amps, very weird.

Discussion in 'Amp Tech Center' started by Cfidave, Jan 12, 2020.

  1. Cfidave

    Cfidave TDPRI Member Silver Supporter

    Age:
    69
    Posts:
    67
    Joined:
    Mar 12, 2017
    Location:
    Elmira,ny
    Having a very strange intermittent noise problem in my amps. I know what it isn’t, but can’t figure out what it is. Here are the facts:


    1. Same noise appears in all 3 amps ( not amp related).
    2. Same noise appears in other rooms in the house, plugged into different circuits
    3. Same noise regardless of what guitars or cables are plugged in.
    4. Noise does Not happen with amp on and nothing plugged in. Even with volume up.
    5. No pedals, just guitar and amp.
    6. Plugging a guitar cable into the amp with no guitar, volume up, yields the same noise.
    7. Noise is definitely getting in through the input jack.
    8. Noise starts out at about 1khz and has transients in the 2-3Khz range.
    9. Noise lasts any where from 3-10 seconds and stops. Starts again randomly.


    I noticed this a few weeks ago, and have never heard anything like it. All of my amps have been extremely quiet up until this point. Almost a cricket sound. I have attached an audio file of the noise. If anyone can help out I would be very grateful.

    Sound file here:
    https://drive.google.com/file/d/1yscbLLUtyYmgFQ10cr01bDRBUu2df8O3/view?usp=sharing
     
    Last edited: Jan 12, 2020
    JL_LI likes this.
  2. Switchy

    Switchy Tele-Afflicted

    Age:
    50
    Posts:
    1,307
    Joined:
    Nov 15, 2019
    Location:
    Arizona
    That sounds like a dimmer light switch. Or possibly some LED or fluorescent bulbs.
    It could even be your bigscreen tvs.


    TIP: If you hold the tip of your guitar cable near the noise source, it gets louder. So, you can actually use your cable as a noise detector.
     
    kram29 and Dismalhead like this.
  3. Durtdog

    Durtdog Poster Extraordinaire

    Posts:
    7,895
    Joined:
    May 19, 2004
    Location:
    Tennessee
    I heard a strange noise in all of my amps, and eventually figured out it was my playing.

    Seriously, it sounds like an electricity issue in your house with a dimmer or something running in or around your house like a motor.
     
  4. schmee

    schmee Doctor of Teleocity Silver Supporter

    Posts:
    12,604
    Joined:
    Jun 2, 2003
    Location:
    northwest
    Sounds familiar, like a fridge system creating noise in the wiring. I used to play a small bar that had an ancient huge fridge system that did a lower EQ noise like that when the fridge motor turned on...
     
  5. Frodebro

    Frodebro Doctor of Teleocity Ad Free Member

    Age:
    50
    Posts:
    16,136
    Joined:
    Aug 17, 2012
    Location:
    Seattle
    Could it be your cell phone? I know that mine will cause funky noises with my amps if it's too close to them.
     
    dougstrum and 2HBStrat like this.
  6. Forum2003

    Forum2003 TDPRI Member

    Age:
    35
    Posts:
    11
    Joined:
    Dec 23, 2019
    Location:
    Utah
  7. King Fan

    King Fan Poster Extraordinaire

    Posts:
    5,709
    Joined:
    Jan 1, 2013
    Location:
    Salt Lake City
    Nice symptom tests and list. Items 1, 4 and 6 (obviously) say it's external to the amp. As the guys note, new appliance or dimmer or computer or router or anything else at your house?

    New neighbors? Ham operator, CB, Elbonian spies with radio? Are you in apartment, townhouse, lonely mansion? :)
     
  8. Bartholomew3

    Bartholomew3 Friend of Leo's

    Posts:
    3,764
    Joined:
    Dec 8, 2010
    Location:
    Montreal
    Possibly interference from taxi and police radio picked-up by your wiring.
     
    Dismalhead likes this.
  9. Jon Snell

    Jon Snell Tele-Holic

    Posts:
    592
    Joined:
    Aug 31, 2015
    Location:
    Jurassic Coast. UK.
    If the interference is airborne, using a power conditioner on your amp, will have no effect.
     
    modavis99 likes this.
  10. King Fan

    King Fan Poster Extraordinaire

    Posts:
    5,709
    Joined:
    Jan 1, 2013
    Location:
    Salt Lake City
    I bet you've already tried different guitar cables. :)

    Some clever kid in my neighborhood once set their wifi SSID to "NSA Surveillance Van" -- you may want to check the street in front of your home for a real one.
     
    mkdaws32 likes this.
  11. EsquireBoy

    EsquireBoy Tele-Afflicted

    Age:
    40
    Posts:
    1,701
    Joined:
    Jun 21, 2019
    Location:
    Paris, France
    My former flat was situated in a very old building, with old electrical lines. I would have thought it would be noisy as hell, but it was completely ok.
    Three years ago I moved into a 100% new building, with everything responding to the newest standards, and I've got an intermittent (a few seconds every approx. 20 sec) high frequency noise coming through every amp. Tried to unplug literally everything, but it's still there. Must be coming from elsewhere in the building, but never figured out what it is.
    I still wonder about how they managed to deal with this in the 50's, when amps were not even grounded through a 3 prong plug.
     
  12. Slap Axe

    Slap Axe Tele-Meister

    Age:
    49
    Posts:
    259
    Joined:
    Sep 7, 2019
    Location:
    Rocky Mountain Way
    The intermittent nature of it makes me doubt it’s this, but the noise is similar to one I experienced when my neighbor installed one of those invisible dog fences that puts out an rf signal.
     
  13. schmee

    schmee Doctor of Teleocity Silver Supporter

    Posts:
    12,604
    Joined:
    Jun 2, 2003
    Location:
    northwest
    In the old bar I mentioned, nothing seemed to stop it. I tried inexpensive devices like the Hum Debugger. But not a Furman. There are used Tripp Lite power conditioners from computer companies that sell cheap.
     
    Forum2003 likes this.
  14. 2HBStrat

    2HBStrat Tele-Afflicted

    Posts:
    1,065
    Joined:
    Oct 21, 2019
    Location:
    Four Rivers Area of Middle America
    Cell phone...?
     
  15. beagle

    beagle Friend of Leo's

    Age:
    61
    Posts:
    4,214
    Joined:
    Jul 20, 2010
    Location:
    Yorkshire
    Sounds like a laptop power supply to me.
     
  16. JL_LI

    JL_LI Friend of Leo's

    Age:
    70
    Posts:
    3,859
    Joined:
    May 20, 2017
    Location:
    Long Island, NY
    I can’t say for sure, but you may be experiencing RF noise originating from outside your house. I had that problem, possibly from wires strung outside my house. My guitar cables were acting as antennas.

    Try turning your amp on with only a cable plugged in. Drape the cable across the floor. Is is quiet? Hold the cable vertically. Do you now hear the noise? That’s RF. I solved the problem with a Mogami Gold cable. These cables have great shielding that blocks most RF interference. It’s a simple test and if it identifies the problem, the solution is $50 or so depending on the length of cable you need.
     
    Last edited: Jan 12, 2020
    stormsedge and Dismalhead like this.
  17. stormsedge

    stormsedge Friend of Leo's Gold Supporter

    Posts:
    3,025
    Joined:
    Jun 5, 2012
    Location:
    E. Tennessee, USA
    I agree with the "your cable is an antenna" theory. RFI can be tough to track down.
     
    JL_LI likes this.
  18. Cfidave

    Cfidave TDPRI Member Silver Supporter

    Age:
    69
    Posts:
    67
    Joined:
    Mar 12, 2017
    Location:
    Elmira,ny
    Hey guys thanks for the input. It has to be something that has been added in the last few weeks. TV is not new, nor is the cell phones, or appliances or computer. Wifi has always been there with no problems.
    I did try a cable plugged in ( see item 6), used as an antenna and also draped on the floor. Still the noise persists.I don't believe this to be in the house wiring, I think it is RFI airborne. The fact that is not continuous
    but randomly comes and goes, makes it even harder to figure out. Almost like someone or something starts and stops with no particular pattern.
     
  19. Cfidave

    Cfidave TDPRI Member Silver Supporter

    Age:
    69
    Posts:
    67
    Joined:
    Mar 12, 2017
    Location:
    Elmira,ny
    I love that one!!
     
  20. clintj

    clintj Friend of Leo's

    Posts:
    4,957
    Joined:
    Apr 4, 2015
    Location:
    Idaho
    Not for a noise coming on over the airwaves like that. If it were coming in through the house wiring, like if the amp shared a branch circuit with a dimmer, then a conditioner can help.

    Sent from my Pixel 2 using Tapatalk
     
IMPORTANT: Treat everyone here with respect, no matter how difficult!
No sex, drug, political, religion or hate discussion permitted here.