Question about NAD T742 Receiver
When I turn on my Receiver it hums through the speakers for about 3-4 mins. The humming level is constant regardless if I increase the volume or not, then the humming disappear. Thanks.
I have solved thsi problem. The reseller suggested that probably a earthconnection was demaged and indeed that was the problem. by heating the earthconnections, specially the wired ones this problem disappeared.
Posted on Feb 02, 2008
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Is the hum in the receiver-attached speakers or the sub?
How is the sub attached - RCA or speaker-level?
Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.
If it hums with the sub attached, unplug the sub's power cord. Differences in AC ground potentials will generate hum across linked devices.
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