2. amps-preamps
  3. 1010162348

Need Help

My dad has an older Sony reciever.There is a LOUD buzz in both channels.The only source hooked to it is a CD changer.I had a ground loop hum in my system a while ago.This is not the same noise.I checked all the connections,everything is hooked up right.The outlet is two prong,so he is using a power strip with a cheater plug.I tried plugging in the reciever directly into the wall,same results.Any help would be appreciated.Thank You. John
krelldog
sean
6,231 posts
 
I had similar problems with a Sony RX that i took to a friends house for him to use. This model had one of their "fancy" pulse width ( or some funky name ) power supplies in it. No matter where we plugged it into in his house, it had a nasty buzz to it. Several other receivers worked fine though. Plugging the Sony into any outlets in my or anyone else's house did not present a problem. My guess is that this guy ( and your Father ) have got something wrong with their house wiring. Sean
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bob_bundus
1,834 posts
 
Whether switching power supply or linear (whichever it is) try this experiment. Disconnect all inputs to the receiver & retest. Also try turning the AC plug around & test once more. Also try it with the tuner playing. If you get a buzz no matter what, then the receiver's power supply needs repairing.
emfoods0d89
12 posts
 
I agree with the last solution. Turn the plug around. This should eliminate any ground loop problems. Also, unplug any TVs to be sure. If there is still a hum, it needs serviced.
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