Amp hum?

kandrus

Member
Messages
229
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:
 

rockon1

Platinum Supporting Member
Messages
12,980
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
 

kandrus

Member
Messages
229
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
 

calieng

Member
Messages
665
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.
 

FleaRadical

Member
Messages
80
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.
 




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