Tweakers' Asylum

• RE: Transformer hum, why is that? - Synthsayer 15:37:52 02/24/12 (5)
  In Reply to: RE: Transformer hum, why is that? posted by cktc on February 23, 2012 at 01:07:27

  Do you have anything in your system connected to a cable TV input like cable box, or other video gear?
  "Ad Astra Per Alia Porci", - To the stars on the wings of a pig: John Steinbeck
  
  

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  • RE: Transformer hum, why is that? - cktc 12:05:54 02/25/12 (4)
    In Reply to: RE: Transformer hum, why is that? posted by Synthsayer on February 24, 2012 at 15:37:52

    I have my system connected to computer. Is that matter? But the hum is machanical hum from the transoformation.
    

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    • RE: Transformer hum, why is that? - Synthsayer 15:27:21 02/25/12 (3)
      In Reply to: RE: Transformer hum, why is that? posted by cktc on February 25, 2012 at 12:05:54

      Are you connecting the computer audio output to a dedicated PC audio input jack on an AVR or similar gear?
      Even so, you could be getting hum from a mismatch of impedance between the PC's output and the inputs of the AVR or preamp.
      Check the link to DAK Electronics for DAK-CS1 impedance matching transformer with interconnect for computer audio.
      http://www.dak.com/Reviews/2045Story.cfm
      
      "Ad Astra Per Alia Porci", - To the stars on the wings of a pig: John Steinbeck
      
      

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      • RE: Transformer hum, why is that? - Synthsayer 15:31:52 02/25/12 (2)
        In Reply to: RE: Transformer hum, why is that? posted by Synthsayer on February 25, 2012 at 15:27:21

        PS I use the DAK CS-1 connecting a laptop to my Harman AVR 154 and it works very well.
        No noise or hum.
        I can't say for sure this is THE problem but it is a strong possibility.
        Do you hear hum when everything but the speakers are disconnected from your amps/preamps or AVR?
        "Ad Astra Per Alia Porci", - To the stars on the wings of a pig: John Steinbeck
        
        

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        • RE: Transformer hum, why is that? - Synthsayer 15:38:18 02/25/12 (1)
          In Reply to: RE: Transformer hum, why is that? posted by Synthsayer on February 25, 2012 at 15:31:52

          I just reviewed your first post.
          Am I correct in saying that the hum is not coming through the speakers, but is an electrical hum coming from the transformers in the amplifiers?
          I'm afraid I can't think of anything that would cause that except a problem in the amps.
          What type amps?
          How many Amperes does the electrical circuit carry from the electrical panel?
          "Ad Astra Per Alia Porci", - To the stars on the wings of a pig: John Steinbeck
          
          

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          • RE: Transformer hum, why is that? - Synthsayer 15:40:35 02/25/12 (0)
            In Reply to: RE: Transformer hum, why is that? posted by Synthsayer on February 25, 2012 at 15:38:18

            Please disregard posts about connections and impedance:-)
            "Ad Astra Per Alia Porci", - To the stars on the wings of a pig: John Steinbeck
            
            

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• RE: Transformer hum, why is that? - wheezer 19:16:03 02/23/12 (0)
  In Reply to: RE: Transformer hum, why is that? posted by cktc on February 23, 2012 at 01:07:27

  Check the Vac coming from the wall with your DMM.
  Might be a bit high.
  

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• RE: Transformer hum, why is that? - rwiley 09:12:25 02/23/12 (1)
  In Reply to: RE: Transformer hum, why is that? posted by cktc on February 23, 2012 at 01:07:27

  Sounds like DC on the power line at your new location. Lots of info on the internet regarding this problem and DIY DC Blockers. Here's one.
  
  

  • http://theartofsound.net/forum/showthread.php?t=11219   (Open in New Window)

  
  

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  • OMG is that still around? - Tweekeng 19:38:49 02/23/12 (0)
    In Reply to: RE: Transformer hum, why is that? posted by rwiley on February 23, 2012 at 09:12:25

    I hope your insurance is paid up.
    

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• Disconnect all inputs to your amps and turn them on. No hum? If not, it is not your amps. - Norm 06:14:21 02/23/12 (1)
  In Reply to: RE: Transformer hum, why is that? posted by cktc on February 23, 2012 at 01:07:27

  Add the preamp and test again. No hum, it is not the preamp. etc.
  

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  • This is all to say that it may not be your new house. nt - Norm 07:29:08 02/23/12 (0)
    In Reply to: RE: Disconnect all inputs to your amps and turn them on. No hum? If not, it is not your amps. posted by Norm on February 23, 2012 at 06:14:21

    a
    

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• RE: Transformer hum, why is that? .......DC - Dynobot 05:44:41 02/23/12 (0)
  In Reply to: RE: Transformer hum, why is that? posted by cktc on February 23, 2012 at 01:07:27

  One of the many reasons why I went with Balanced Power.
  
  However there are other ways to get rid of DC in the power line.
  
  
  Dynobots Audio
  Music is the Bridge between Heaven and Earth - 音楽は天国と地球のかけ橋
  
  

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• RE: Transformer hum, why is that? - rkeman 05:15:46 02/23/12 (1)
  In Reply to: RE: Transformer hum, why is that? posted by cktc on February 23, 2012 at 01:07:27

  There is probably DC on the power line. This saturates toroidal transformers at relatively low voltages and causes mechanical hum. IE transformers and many switching power supplies are less susceptible to the problem. Some manufacturers pot transformers to prevent humming and a number of power line filters offer DC protection.
  

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  • What is cause DC in my AC outlet? - cktc 12:10:01 02/25/12 (0)
    In Reply to: RE: Transformer hum, why is that? posted by rkeman on February 23, 2012 at 05:15:46

    ... and do you have any specific product suggest for reduce the problem?
    
    Thanks.
    

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