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The problem sounds like the amplifier shutting down in protect mode. This can be due to a shorted speaker cable, or even a speaker that may be run out of phase, or too much load on one channel of the amplifier. First check and make sure there are no cables that may be exposed and rubbing against each other. That will cause a short. Secondly try re running and testing each speaker line as you go individually. While you are rehooking the cables up, make sure that you + and - are in the correct terminals on the speaker and the receiver's speaker outputs. Also make sure you are not running more of a load on the receiver than it can handle such as running multiple speakers on the same output. This will cause the amp to shut down. Only run a load (8ohm, 4 ohm etc..) that the receiver speaker output can handle Two 8 ohm speakers make a 4 ohm load thus making it harder for the receiver to work, and then it overheats and shuts down. Good Luck
Generally speaking heat is a byproduct of the amp working too hard. This can be caused by speakers that are not matched correctly to the amp. In other words using 4ohm speakers on an amp that is expecting an 8ohm load. If this is a new occurrance, than look for speaker wires that have frayed and are somewhat crossed. From the amp's perspective this will look like a low ohm load. The amp may continue to function correctly, but work extremely hard and generate excessive heat. This will untimately damage the amp. Check the speaker wires first.
Also, does this occur even at low volumes? If so, this again points to a short in the wires or speakers themselves.
You need to connect most turntables to a PHONO input or buy a PHONO preamp. Many newer receivers do not have a PHONO input.
The AUX port you are using would work fine for a device like a CD player, but turntables need to be amplified. You can buy an external Phono pre-amp from Radio Shack.
I don't know anything about this site, but something like this device should work for you.