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High pitch pulse sound coming from stereo receiver
January 29, 2014 6:49 AM   Subscribe

I am getting a high pitch sound coming out of stereo in a pulse that would make a dog loopy. I do not have a sophisticated setup. The stereo is plugged into the wall. Apple TV is plugged into wall and TV. Router plugged into power strip along with DVD player. I switched out all RCA plugs and speaker wire.

No buttons like tape monitor or special sound effects are on and everything is plugged in normally. The receiver makes this pulsing sound when plugged in but is turned off. 2 feet away I have a Mac computer but it is not connected physically to anything but streams to Apple TV when it is on (which isn't often).

I suspect my stereo receiver just might be going bad as it is an early 2000s model. I bought it used 5 years ago but don't recollect hearing the noise then. I never play music loud so that isn't an issue.

Any thoughts on this would be appreciated but not urgent.
posted by snap_dragon to Technology (8 answers total)
 
It's not the usual 60 Hz hum?
posted by Thorzdad at 7:05 AM on January 29


You're being unclear about whether this sound is coming from the speakers or the receiver itself...

If from the receiver itself, seems like a transformer is going bad.
posted by neckro23 at 7:08 AM on January 29 [1 favorite]


Is it the GSM gallop? Reorientation of cables might help, as might some appropriate ferrites on the cable.
posted by scruss at 9:24 AM on January 29


Not the 60 Hz hum, not the GSM gallop, and coming from receiver not speakers...(unplugged speakers to triple check).
posted by snap_dragon at 9:49 AM on January 29


Could also be a failed capacitor causing the high-pitched sound. Circuit boards of the mid-2000s were particularly prone to capacitor failure.
posted by Blazecock Pileon at 9:49 AM on January 29 [1 favorite]


Yeah, I was also going to suggest the possibility of failing capacitor(s), especially if it's coming from the receiver itself when switched off.
posted by TwoWordReview at 10:39 AM on January 29 [1 favorite]


Anyone recommend a place to find a reasonable very basic used receiver that is a trustworthy site? I don't trust Craigslist on this stuff but only have around $100 right now. It only needs rca and two speaker output w/ remote capability and I will be pleased. It doesn't have to be new/loud/super hi-fidelity special but after reading about the capacitor link/Taiwan I could use any input from MeFi friends. (And if asking this question is a breach of protocol since it branches from the previous question... understood.)
posted by snap_dragon at 12:45 PM on January 29


Forgot to add, thank you for your answers. From what I have read and my layman's understanding, I am confident that you are right on the capacitors.
posted by snap_dragon at 12:48 PM on January 29


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