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Amp hum?

Discussion in 'Amps and Cabs' started by kandrus, Feb 15, 2008.

  1. Feb 15, 2008 #1
    kandrus

    kandrus Member

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    Mar 14, 2007
    Location:
    Halifax, NS
    Hey...

    I have a DRRI, and as of late, there has been a hum, or buzz coming from the amp as soon as it warms up.

    Some have suggested loose tube? Others one tube is gone (12AT7?)...

    Is there something I can do to check? Or take it somewhere to be checked?

    Maybe just re-tube?

    Any help would be great!

    Kyle :eek:
     
    kandrus, Feb 15, 2008
    kandrus, Feb 15, 2008
    #1
  2. Feb 15, 2008 #2
    rockon1

    rockon1 Member

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    Try simple stuff first. Make sure your guitar,cables,etc are not the problem. (Plug directly into the amp if you normally dont)Try it in another outlet. lastly try swapping in another set of tubes-hopefully you have a spare set around just for stuff like this. If it happens to fix the problem you can one by one put the old ones back in to find the offending tube. Bob
     
    rockon1, Feb 15, 2008
    rockon1, Feb 15, 2008
    #2
  3. Feb 15, 2008 #3
    kandrus

    kandrus Member

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    I just bought it used from a local retailer a few months ago, so I have no tubes, but friends certainly do!

    Thanks for the input!

    Kyle
     
    kandrus, Feb 15, 2008
    kandrus, Feb 15, 2008
    #3
  4. Feb 15, 2008 #4
    calieng

    calieng Member

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    San Diego, CA
    A couple of thoughts...

    Mismatched power tubes can make the amp hum and also defective filter capacitors. This would cause it to hum even if nothing is plugged into it. If the hum stops when you unplug the guitar cord then this is not the problem.

    Check the obvious things like a bad guitar cord or even try a different wall outlet some where else.
     
    calieng, Feb 15, 2008
    calieng, Feb 15, 2008
    #4
  5. Feb 15, 2008 #5
    FleaRadical

    FleaRadical Member

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    Singapore via Texas
    Also be aware if there are any fluorescent lights, computers, or other digital equipment nearby. I have a keyboard amp in my jam room and if I stand within about 2-3 feet of it, I get hum.
     
    FleaRadical, Feb 15, 2008
    FleaRadical, Feb 15, 2008
    #5
  6. Feb 15, 2008 #6
    kandrus

    kandrus Member

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    Thanks guys! I think it is the tubes... so I'll be re-tubing soon.

    Kyle
     
    kandrus, Feb 15, 2008
    kandrus, Feb 15, 2008
    #6

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