Yamaha rx a750 - noisy coil ? Transistor?

bazlama

Novice Member
Dear all, i did find a very clean av receiver replacing my denon e300 however it is making noise after getting hot/warm in about 30/40mins. That is not nice to have that coil or transistor noise when you listen music in low volumes. The person i did buy was kind to give me a week to test it and return if anything wrong. What should i do ? I paided $110 for it and i liked it. I just updated the firmware to the latest but dont know if device was making that noose before that or not since i was testing it. Let me know if it fails soon or its a quick fix or not. Thanks
 

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