2. amps-preamps
  3. 1411822537

"Buzz" Coming Through Speakers

I have a Audio Research SP16 tube preamp. I recently noticed that without any music being played (or during quiet music passages)there is an irritating "buzz" coming from the speakers. Since the tubes had considerable play time over several years, I replaced the tubes. However, the "buzz" continued. In the past, changing the tubes resolved the problem. But not this time.

I would appreciate any thoughts you might have. Thank you so much.

Kit
kitjv
yogiboy's avatar
yogiboy
5,783 posts
 
How are you sure the problem is with the preamp and not
something else causing the buzz? If it is not on a dedicated
circuit you can start unplugging anything that is plugged in
to that circuit. A dimmer switch is a known source for
producing a buzz.
kitjv OP
69 posts
 
The audio system is plugged into a general lighting circuit. With all lights in that circuit off, the buzz persists. So a dimmer switch is assumingly ruled out.

I unplugged (one by one) all of the audio/video components plugged into that circuit. The buzzed ceased only when the preamp & the power amp were unplugged.
ozzy's avatar
ozzy
7,555 posts
 
Its usually caused by Cable or the Sat/Antenna connection.
yogiboy's avatar
yogiboy
5,783 posts
 
Plug in a component directly into the power amp leaving the preamp out of the loop and see if the buzz goes away. I presume you have no power conditioners plugged in.
magnumpi205
504 posts
 
Replace the dimmer switch with a regular switch.
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