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the low level hum is driving me crazy,

Discussion in 'TAG McLaren Audio Owners' Forum' started by harv, Jul 26, 2005.

  1. harv

    harv
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    I dunno if its always been there but recently I noticed a low level hum coming from my power amp (100p) and now that I've noticed its all i can hear when there is no music playing. Its wired with a kimber yello power cord and plugged into a isotek solus gII. Has anyone else noticed this; is it normal or should I start saving for a repair bill?
     
  2. roversd1

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    connect the 100P via the original mains lead straight into an ordinary mains plug, does it hum?
     
  3. GrahamMG

    GrahamMG
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    :smashin:
     
  4. roversd1

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    you know how I feel about 'special' cables, mains filters etc :D
     
  5. harv

    harv
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    I've already tried that, didn't make any difference. Also tried using the isotek and the tag supplied cable and still had a hum. You can only hear it when you're near the amp but once you've noticed...
     
  6. GrahamMG

    GrahamMG
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    Are you saying the actual unit is humming and it isn;t coming fromm the speakers?
    If so then it is almost certianly transformer noise, they (transformers that is) all do it, some make more noise than others...... You can (fingers crossed) get the transformer replaced but it might also make a noise over time...... Such is life....
    I assume you have taken the unit to a mates house and tried it there just to isolate any mains imbalance that may be present in your house? Mains imbalance can also make transformers hum mechanically.....
     
  7. roversd1

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    Look underneath the unit, locate the transformer. If you are lucky and my memory is correct, you may be able to locate a screw that tightens up the transformer (sometimes its a nut inside).

    Failing that, if the hum is not over the speakers, you may have to live with it.

    Try the amp on the normal TMA power lead in a different room. Bear with me as the amp may simply be showing up a minor issue with your house electrics as per Graham.
     
  8. GrahamMG

    GrahamMG
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    Just for my peace of mind, unplug the unit before you tighten it up...... :lesson: Lifting the lid and getting at the nut might be the other way...... Be careful as F@*$ing tight isn't good either...... Did TAG put rubber disks between the Toriod and the metal clamp washer?
     
  9. roversd1

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  10. GrahamMG

    GrahamMG
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    So as long as the 4ft monkey wrench isn't used and a modicum of common sense is used, not much chance of it going wrong then......
    As usual if in any doubt at all get someone that knows what they are doing involved, less likely to end in tears that way.....
     
  11. liam_b

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    Start by switching and unplugging the mains, then remove all the connections to the amp, plug back into the mains using a standard kettle mains lead, power up the amp and see if it still hums. If it does then it sounds like either DC on the line or the transformer has become noisey.

    Most mains filters and specialist cables do nothing to remove DC from the line or improve the basic quality of the mains feed, they just cost money and give little real benefit (just like Tony :devil: )
     
  12. harv

    harv
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    Just had a look underneath no visible screw. Not that techy minded to take the cover off, will try at my bro's house to see if it my mains supply. If not I'll have to live with it until I trade it in.
     
  13. GrahamMG

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    Hi Harv.
    What RoverSD1 suggested is a 2 minute thing, find someone skilled in such things and give it a go, you have nothing at all to loose. Personally my 100x5R would be irritating for the same reason but I built a big cabinet and bunged it in so don't hear it, mind you when the neighbours are out I wouldn't hear the hum anyway :devil:
     
  14. Nuno Santos

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    LOL :thumbsup:
     
  15. Stevesky

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    This subject was covered here:
    http://www.avforums.com/forums/showthread.php?t=220447&highlight=DC+mains

    Since this thread a pre-built device called a GF-1 made by TK-Audio in Germany has come to my attention, *hopefully* it should shut up the humming transformer in your amp by removing the DC offset component from the mains. I've never used one personally, but I know a few people who have tried it and it did the trick. If you do a search on Ebay.de you can often pick them up at quite a good price (do a search for TK-Audio GF-1 Netzfilter). It's an inline box of tricks so requires no electronics or engineering know how to install.
     
  16. harv

    harv
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    Thanks (all) for the advice, will have a look over the w/end. On a another note what would be a good value for my amps ? for trade in (spotted a second hand krell 300i). The amps are a 60i and 100p.

    thanks again
     

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