Audiolab 8000A pre-amp stage - 8000P power amp. All powered via an Olson filtered 4 way and dedicated earth spike wired with Kimber cable. As soon as I replaced the standard sb wallwart with the new psu connected via IEC lead to the mains I got the hum. I think the problem possibly lies in the fact that the 4 way metal box has the kimber kable direct to an earth terminal on the Russ Andrews super socket, as well as all the mains leads being individually earthed. By unearthing the SB it stopped the hum immediately. I can't see it presenting a major problem as it'll still earth via the Phono's anyway. What do you think? ST
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