2. amps-preamps
  3. 1347156354

Amp hums in standby mode when TV is on

Hi, my Sherbourn 5/1500A power amp starts humming whenever the TV in the same room is operating. This occurs even when the amp is in its standby state, and also happens when using the amp(although you can't typically hear the humming at that point because of the sound from the speakers). What's more, as the image on the TV varies in brightness, the intensity of the humming/buzzing also varies. If the TV is off, the amp is dead quiet. I am assuming this is some kind of ground loop problem.

Should I try to plug the amp in with a "cheater plug"? There is a sticker on the back of the amp that indicates that the amp must be used with a grounded power cord.
mtrot
unsound
7,336 posts
 
Sometimes careful cable dressing/orientation can help mitigate situations like this.
mtrot OP
804 posts
 
Thanks, yes it is a mechanical buzzing, very loud at times.

It is my understanding that the power standby feature on this amp is designed such that when it receives a signal and switches on, it is supposed to be somewhat in a "warmed up" and stable status for good sound.

I will also see if adjusting the speaker and/or interconnect cables has any effect, which I doubt.
jea48
4,546 posts
 
Mtrot,

Send an email to member Gbart,
(Email address), sae2300@optimum.net

Explain your power xfmr mechanical buzzing problem to him.
Good chance he can help you solve it.
.
ddd1
261 posts
 
You might want to clarify whether your cable TV is actually connected to your audio system and whether the audio components (ie. your stereo) and video components (ie. your TV) are on separate circuits.
trelja
3,224 posts
 
Reminds me of that old joke about the guy who visits the doctor, and says, "Doc, it hurts when I do this." The doctor's reply, "Then don't do that."
More to discover