Just has this exact same issue with my REF 150. I happened after about 800 hours of use. The hum started to happen after about an hour of use. ARC quickly sent a new transformer and my dealer repaired it within a couple of week. Have been using it for two weeks without any issue.
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Mac Mini 2012 SSD - Lampi Big 7 DAC - Oppo BDP 95
ARC Ref 10 preamp - ARC Ref 150SE amp
MartinLogan CLX Art Speakers - MartinLogan Balanced Force 210 Subs - Shunyata Anaconda speaker cables & Interconnects - Shunyata DPC-6 / Triton v2
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