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Hi there, sorry to hear you're having trouble with the sony
normally, these receivers are intended to be used with an antenna. If you've been pulling in stations without one in the past, and it has suddenly started buzzing, there is most likely some noise/interference, which could be coming through the radio waves (caused by cordless phones, wifi, or other wireless devices) or through the power line (caused by a nearby motor, compact fluorescent lighting, or other audio device.
The last possibility is that there is an internal hardware defect in the receiver (the tuner is going bad).
There are a few things you can try here,
the cheapest, and easiest, is to connect an external FM antenna.
If the issue is interference outside the home, the antenna will help you to pull in a stronger signal, hopefully negating the noise/interference.
There are a few different types of antennas that will work for your system,
A dipole antenna, like this:
Axis PET 10-8110 Fm Dipole Antenna (click for link)
those are meant to be wall mounted (or on the back of a cabinet)
or you can get a tabletop type (also wall mountable) like this:
Audiovox Terk FM Only Stereo Antenna... (click for link)
Note that almost all fm antennas are going to have a pair of screw down connectors, so whichever you go with, you'll need a push on a adapter to use the coax port on the sony:
RCA Matching Transformer (click for link)
You should be able to get an antenna and adapter together for under $15, either online, or locally (radio shack, frys electronics, best buy, etc)
If the antenna doesn't help, then the cause of the problem would most likely be electrical line noise, which you can address with a powerline filter, like an isobar:
Tripp Lite ISOBAR6ULTRA Isobar Surge... (click for link)
And if that still doesn't help, then it would really only leave the possibility of a fault within the tuner. At that point, there really isn't any practical recourse, as the necessary repairs would be more than you'd spend to buy a whole new receiver. In that event, some alternatives you could consider are an external tuner, either for terrestrial or satellite radio, or an internet radio device.
Nathan, the FM radio from my receiver was working perfectly. Now there is a consistent buzz- why would an antenna fix the buzz when I didn't need an antennae before? Could there be a loose connection? I really am not satisfied with the answer that I need to purchase an antenna when the receiver never needed one before.
Nathan, also it is only the FM radio station that makes the buzzing noise, not the CD or TV audio. Therefore, I do not think it would be an internal problem with the receiver otherwise all audio would buzz- is that correct?