Same with my 950 - volume control turned up sometimes REDUCES volume and visa-versa. It also slips sometimes and the volume does not change when I turn the control. And, the transformer buzz in maddening. BUT, if I'd bought a name brand receiver 10 years ago, would it be problem-free today?
I think not.
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"Do you expect me to talk?"
"No Mr. Bond, I expect you to die!"