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NAD 3155 cutting out

Hello! I'm a newbie to this board, but Google searches reveal good knowledge here, so I'm gonna ask.

Yesterday I bought a NAD 3155 off Craigslist -- it was a good price and when I first got it wired up, it sounded fantastic. I listened to it for a few hours yesterday.

Today when I listened to it, it cut out after about 10 minutes. It continued playing at very low volume, and the volume knob had no effect. Turning it off and back on allows it to work again, for about 10 minutes.

This happens even when listening on headphones, so the problem seems to be in the pre amp.

Perhaps related: when I listen to my turntable, I get an increasingly loud hum, even with the ground wire connected.

I'm far from an electronics expert but this amp was inexpensive enough that I would be happy learning on it. Any recommendations on things I should check first?

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  Kimber Kable  

Topic - NAD 3155 cutting out - moishe 09:29:07 11/16/14 (10)
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