2. tech-talk
  3. 1059709294

What causes loud num noise?

I have an tube amp using SE connections and have followed manual for the exact way to set up the system. How come the amp produce a loud hum noise, just like standing at the back of a big television. The noise is independent to the volume control. I plug the amp directly to a wall power receptacle. I have used the same receptacle connecting to my old solid state amp and it works fine.
awchui

Showing 2 responses by lak

lak's avatar
lak
4,728 posts
 
I failed to ask therefore I made an assumption. Is the noise coming from your speakers (as Kchahoc said ground loop) or is it coming from your amp?
lak's avatar
lak
4,728 posts
 
Some transformers are louder than others. You could contact the manufacture to see if there is anything that they could do to remedy the problem. If it's not a defect in the transformer the options are usually to replace the transformer (at your cost unless it's under warranty) or the company might use some damping material inside the transformer which usually lowers the hum.
More to discover