Hey anyone know what these receivers should operate at normally? what temp is to hot?
As far as I know no manufacturer has ever published such a parameter. I have a monstrous 5803, and it has never gotten so hot that I could fry eggs on it. And I jam sometimes.

I think at about 100' degrees I'd be getting concerned (for any receiver other than Onkyo

), and at 110' I'd be outright worried for any piece of equipment. I'm not suggesting these are hard and fast numbers, or that I've ever taken a thermometer to my equipment. But at some point, the insulation on the capacitors (and perhaps everything else), and the solder joints and copper windings

will melt. I've never had a problem with overheating equipment, but then, I always keep it well-ventilated, clean, and at about 65' room temperature. And I don't have one of those hot Onkyos.