buzzing sound with Skynet 8080 SMPS

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Hello,
I've just got a Skynet 8080 SMPS to power up my T-Amp.
I've made all the connections described on http://myweb.tiscali.co.uk/nuukspot/decdun/gainclonesmps.html#smpsreview but I get a buzzing sound wich decreases when I disconnect Earth on the supply.
It seems as if the switching mode gets to the signal
It totally disappears with my regulated supply.
Another strange things happens when I use a 10 ohms load as described: the 12v supply goes up to 13.2V.
Thank you for any advice
 
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