As mentioned, many appliances set off the humming. Even though I have dedicated lines from a separate sub-panel, I still hear the hum whenever the microwave is used. Other motors and appliances do the same. Worst case, you may need to go to a line conditioner of some sort -- preferably one that attacks both small amounts of dc voltage that could be in the line (you could check that) and the spurious high frequency noise that is part of our AC system.
Dealing with transformer hum
My Belles 150 makes a humming/vibrating sound which I'm told is due to the transformer. At average listening levels, the hum is not an issue at all, because it's not loud enough to be heard, but I do a lot of really low level listening at nights, and this hum is driving me absolutely nuts.
I don't have the option of really moving the amp much and there are no enclosures to hide it away in. Any ideas?
Thanks in advance,
I don't have the option of really moving the amp much and there are no enclosures to hide it away in. Any ideas?
Thanks in advance,
Showing 2 responses by ozfly
Here's an interesting reference to the Nelson Pass comments and a lot of discussion around hum circuits. You may have to join the diy site (which is a pretty cool place) to see the circuits themselves -- there's a link to get to the original posts and, after joining, you can see the attachments. BTW, the scope pictures of dc and transformer saturation at the end is very instructive -- I loved the comment "a 60Hz transformer is basically a big, heavy bad antenna" (that may not be an exact quote). Here's the site: http://www.diyaudio.com/forums/showthread/t-2080.html |