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BACKGROUND HUM PRESENT AT ALL TIMES - Audio Players & Recorders

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There are a number of possibilities.

First, get an outlet checker from the electrical department of a building supply store (for the US electrical systems, it has three neon lights indicating normal, open ground or hot and neutral wire reversal). If one of the outlets you are using for your audio equipment is not properly wired, it could cause hum.

Second, disconnect external input devices one at a time (CD players, TV sound, cassette decks, etc., but leave the speakers connected). If the hum goes away with one of those devices, it may have a problem with ground isolation. Post back if you find this, and include brand and model number. If the hum goes away with the very last piece of equipment, and comes back with something else connected again, or is present with two particular devices connected, post back with details of the devices and how they are connected (both signal cables and power).

If the hum is still present with all input sources disconnected, it's time to check the power supply inside the receiver for failing capacitors or other defects.

Posted on Jan 03, 2011

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Hello,
What sources do you have connected to the receiver? The thing to do is to disconnect your sources one at a time and see if one of those eliminates that hum.

Posted on Jan 03, 2011

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