Amp hum?

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

  1. kandrus

    kandrus Member

    Messages:
    229
    Joined:
    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:
     
  2. rockon1

    rockon1 Member

    Messages:
    11,472
    Joined:
    Aug 12, 2005
    Location:
    Stamford CT
    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
     
  3. kandrus

    kandrus Member

    Messages:
    229
    Joined:
    Mar 14, 2007
    Location:
    Halifax, NS
    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
     
  4. calieng

    calieng Member

    Messages:
    647
    Joined:
    Nov 21, 2003
    Location:
    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.
     
  5. FleaRadical

    FleaRadical Member

    Messages:
    80
    Joined:
    May 4, 2007
    Location:
    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.
     
  6. kandrus

    kandrus Member

    Messages:
    229
    Joined:
    Mar 14, 2007
    Location:
    Halifax, NS
    Thanks guys! I think it is the tubes... so I'll be re-tubing soon.

    Kyle
     

Share This Page