Does anyone have any advice please?
A week ago, I purchased a hifi receiver and on connecting it up, found that it suffered from an annoying hum in the left-hand channel, while the the right hand channel was much quieter.
I tried every remedy for hum that I could think of and also tried disconnecting all the inputs - but still the hum wouldn't go.
I connected up all my usual inputs to my previous amplifier, a Denon PMA100M. Left and right channels were both dead quiet, connected or disconnected.
I returned the product to the supplier, and today received another example of the same model of receiver. It too has a left-hand channel hum, both when connected and otherwise. I can hear it clearly at 10ft away.
This evening, I switched over the speaker cables. This made the right hand speaker hum, so I think I can rule out interference in the speaker cable (though that always seemed unlikely or impossible).
Could it be that the product has a design fault that could cause the problem? Could the two receivers have the same manufacturing fault? Do I have to return it and buy a different receiver? Are there any other tests I can try that would reveal anything useful?
Is there some earthing trick I could try? I notice that the mains cable plug has no earth, as the earth pin is plastic.
If there's a way of getting this right, I'd be very grateful - if I send this thing back, an alternative of the same wattage from the same store would be significantly more expensive!
Thanks, Gavin Atkin
A week ago, I purchased a hifi receiver and on connecting it up, found that it suffered from an annoying hum in the left-hand channel, while the the right hand channel was much quieter.
I tried every remedy for hum that I could think of and also tried disconnecting all the inputs - but still the hum wouldn't go.
I connected up all my usual inputs to my previous amplifier, a Denon PMA100M. Left and right channels were both dead quiet, connected or disconnected.
I returned the product to the supplier, and today received another example of the same model of receiver. It too has a left-hand channel hum, both when connected and otherwise. I can hear it clearly at 10ft away.
This evening, I switched over the speaker cables. This made the right hand speaker hum, so I think I can rule out interference in the speaker cable (though that always seemed unlikely or impossible).
Could it be that the product has a design fault that could cause the problem? Could the two receivers have the same manufacturing fault? Do I have to return it and buy a different receiver? Are there any other tests I can try that would reveal anything useful?
Is there some earthing trick I could try? I notice that the mains cable plug has no earth, as the earth pin is plastic.
If there's a way of getting this right, I'd be very grateful - if I send this thing back, an alternative of the same wattage from the same store would be significantly more expensive!
Thanks, Gavin Atkin