ho hum...............

zappa 100

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Sep 8, 2007
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i have a persistent and annoying hum emanating from my alpha 9 power amp ,through the speakers. the volume of the hum stays the same regardless of volume control position. the mains block is plugged into a double socket . in the other side of the socket ,a small lamp is plugged in. when i either switch this lamp on or off at the socket ,the hum disappears, only to return about 1 and half to 2 minutes later. can anyone explain why this should happen and if it can shed any light on to the source of the hum?
 
A

Anonymous

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[quote user="Andrew Everard"]
Energy-saving lightbulb, by any chance? Or a low-voltage halogen lamp? They can be very noisy in electrical terms...
[/quote]

Yes, but if it went after he turned it off surely this cannot be the problem. Perhaps try swapping round the plugs around, it may be a dodgey socket.
 
A

Anonymous

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[quote user="JoelSim"]Why don't you try a shielded mains cable?[/quote]

A very viable point...
 
A

Anonymous

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My mum's Quad 405 went the same way too...but it did take 28 years of use!
 

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