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Thread: Transformer Hum

  1. #1

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    Default Transformer Hum

    Can a humming transformer, vibrating due to low voltage, creat a magnetic field strong enough to screw up a TV about 2-3 feet away?
    Rob
    Yamaha RX-V1500 // Outlaw Audio M200 (x2) Panasonic TH-52PZ700U
    Sony DVP-NS715P // Sony Playstation3 // Roku Soundbridge M1000[/color]
    Polk LSi15 (w/Monster Z2 Wire) // Polk LSiC // Polk LSi7 // Velodyne DLS-3500

    Workshop Rig: Creek 4330 // Technics SL-P310 // Cambridge Soundworks Ensemble 2

  2. #2

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    Default

    Not likely, vibration itself does not set up magnetic field. Voltage and current do. Actually, if the voltage is lower than normal, the magnetic leakage flux should be weaker.

  3. #3

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    Default Well-

    Okay-
    The whole saga as I have finnaly figured it all out:

    We got a new shed out in the yard that I am going to use as my workshop. I have been working to finish the interior, so I have an electric space heater in there on an extension cord from the house. I didn't know it, but the exterior outlet that the thing is plugged into happened to be on the same circuit as the AV gear.

    So, I noticed my M200 amps humming a couple of days later. I called Outlaw and Scott suggested it was a voltage or current drop in the line from something else pulling a large load. I figured out it was the space heater. Scott said it did no harm to have the amps hum, so seeing as how the space heater was only temporary, I didn't want to run an extension cord from another circuit as I could live with the hum for a few more days.

    So with the amps humming every once in a while. I started to notice a color bloom in the corners of my TV. I had an old set of speakers that I thought were shielded next to the TV for a little while and thought they might have done it. The TVs self-degauss wasn't doing anything for days, so I figured the speakers had screwed up the shadowmask bad enough to need a manual degauss.

    Well, the lightbulb went off in my head and I woke up at 3am and checked for Santa, then the TV. Colors still there, I turned off the humming amps, ran the extension cord and waited a few minutes to let the field dissapate.

    I Turned the TV on and -magic-. The degauss actually worked and the picture is perfect again. So, yes, the transformers were putting out a huge magnetic field while they were humming.

    So, to recap: Space heater on same circuit as M200 amps caused voltage drop, making the amp transformers hum. Humming caused magnetic field that screwed up the TV. Fixed by putting amps on another circuit while space heater is in use. Permanant fix will be to run a dedicated line for the AV gear. Phew!
    I need an Egg Nog.
    Last edited by RobXant; 12-25-2004 at 12:33 PM.
    Yamaha RX-V1500 // Outlaw Audio M200 (x2) Panasonic TH-52PZ700U
    Sony DVP-NS715P // Sony Playstation3 // Roku Soundbridge M1000[/color]
    Polk LSi15 (w/Monster Z2 Wire) // Polk LSiC // Polk LSi7 // Velodyne DLS-3500

    Workshop Rig: Creek 4330 // Technics SL-P310 // Cambridge Soundworks Ensemble 2

  4. #4

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    Default

    .....and the 64,000 dollar question is,"do we own electronics,or do they own us"?
    Outlaw 990 Processor
    Outlaw 755 Amp
    Denon 2900 dvd-sacd
    Dishnetwork HD-Dvr
    55" Sony LCD RPTV
    Lsi 9-fronts
    Lsic-center
    Rt55i- surrounds
    Velodyne cht-10 sub

    2007 Dodge Quad cab
    Kenwood Excelon KDC-X891
    JL Audio 300/V2
    Polk Audio SR 6500 - Fronts
    Polk Audio DB651 - Rear
    2 -10" Treo Subs
    Interfire IB 2600C sub amp
    Sirius Sat radio
    Ipod connection

  5. #5

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    Default Re: Well-

    Originally posted by RobXant

    So, to recap: Space heater on same circuit as M200 amps caused voltage drop, making the amp transformers hum. Humming caused magnetic field that screwed up the TV. Fixed by putting amps on another circuit while space heater is in use. Permanant fix will be to run a dedicated line for the AV gear. Phew!
    I need an Egg Nog.

    I would have never thought that, but I say learn something new everyday.

    Glad you fixed your problem with your TV.

    Speakers
    Carver Amazing Fronts
    CS400i Center
    RT800i's Rears
    Sub Paradigm Servo 15

    Electronics
    Conrad Johnson PV-5 pre-amp
    Parasound Halo A23
    Pioneer 84TXSi AVR
    Pioneer 79Avi DVD
    Sony CX400 CD changer
    Panasonic 42-PX60U Plasma
    WMC Win7 32bit HD DVR



  6. #6

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    Thumbs up

    I am gonna call Steve at Outlaw on Monday and let him have a good laugh at this one. It's amazing, though that after 5 minutes on the phone with a real knowledgable person (despite the 48 hours for me to put all the pieces together) I had a vexing problem solved.

    I am sold on Outlaw products. Imagine how it could have gone if it was a Sony amp! Hah!.

    Merry Christmas. -- Oh- still looking for any suggestions for a "workshop" integrated amp around $100?

    Best-
    Rob
    Yamaha RX-V1500 // Outlaw Audio M200 (x2) Panasonic TH-52PZ700U
    Sony DVP-NS715P // Sony Playstation3 // Roku Soundbridge M1000[/color]
    Polk LSi15 (w/Monster Z2 Wire) // Polk LSiC // Polk LSi7 // Velodyne DLS-3500

    Workshop Rig: Creek 4330 // Technics SL-P310 // Cambridge Soundworks Ensemble 2

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