That's interesting, as I just had the same experience. I have a GS150 paired with a Ref5SE for about a year and a half. Since the beginning I noticed an unusual and annoying noise from the transformer. I complained, but the dealer blame it on my home electric current, so I bought S PSAudio P10, which reduced the issued for some time until I stared noticing the noise again. I complained last October and they finally took it for repair to replace the transformer, about a month ago. The 1st transformer they received from AR still had a measurable noise, so they are now waiting for another one. When they took my amp they lend me a new GS150 so I wouldn't be without music. After about 2 weeks the new one started to blow fuses, one after the other.
I think the GS150 is a lovely amp, with great sound but with some sort of quality control problem. For the money spent, I had enough with it asked the dealer to collect the amp and am now trying other brands (currently have a Nagra Classic Int).
I also use transparent cables. Mine are gen5 ultra.
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