AVS Special Member
Join Date: Dec 2007
Location: Southern California
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I would suspect a bad, oxidized connection somewhere, particularly anywhere that jumper leads are used between boards or terminals.
I would go through and inspect everything and remove and reinstall any mechanical connections of that type.
A bad capacitor is possible, but Classe uses premium quality components and that would not be my first place to go unless you can see excess hum with a scope on the power-supply output.
That is easy for any tech to identify.