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If the amp does not have a dedicated sockets for a turntable - often marked "phono". Then plugging it into an aux socket won't work. You will need to get a Magnetic Cartridge Pre-amp. The turntable plugs into this and that plugs into your aux socket. If at the present you turn up the volume really loud you might just hear the record playing. That will tell you that the cartridge is OK.
Either you have a poor earth connection or you are getting a lot of static from the records you play. The best way of getting rid of static is a spray you can get for cleaning records. Search on-line for Anti-Static Record Cleaner.
1) The phono input on the receiver contains an additional stage of amplification required for typical turntables.
2) Pluggin in a unit that has a signal level too high will generate this hum.
3) Your turntable contains an pre-amp that allows it to work using an aux input (or tape input) as most receivers today no longer have phono inputs.
4) Grounding issues relate to the older types of turntables where there was NO pre-amp stage inside the turntable. In this case ,the signal levels were so low that stray noise would often get in the way of the signal. Proper grounding would elimiate this noise.
I hope you have it connected to the Phono input on the left rear of the receiver. Otherwise the minute signal generated by the phono cartridge is too small for the other inputs to process.
The buzzing noise/bad channel is probably a bad connection in the tonearm/headshell connection or one of the 4 wires attaching the cartridge to the shell. If you DON'T want to blow up your speakers, TURN YOUR RECEIVER OFF, turn the volume to 0 or select another input before messing around with the tonearm.
Swap the two channels from the tonearm to the Phono connectors to prove the buzzing is external (at the turntable). I think the Dual CS415 uses the old standard headshell. With the volume down flip the lever toward the back, carefully remove the assembly and look over the tiny multi-colored wires with the brass crimp-on ends. We're looking for tight kinks or broken wires. Then put it back. maybe reseat it a few times to wear off any oxidation and try it again.
It is a grounding issue with the turntable most likely. Some turntables came with a ground wire that you attached to the receiver. You can also try a power strip that has a line filter incorporated to get rid of the hum. Check the local stereo shoppe to see if they carry them. You may also want to replace the audio cable that connects the turntable to the amp with a good quality shielded cable. If it has bad shielding it will pick up electrical interference and even radio interference as well. Turntable inputs on receivers have a preamp built in and the gain for each type of pickup is different. The pickup is either ceramic or magnetic and if I remember correctly, the ceramic pickup needed more gain than the magnetic one. The preamp will definitely make a ground hum a lot more audible.
I agree with 'radio head.'
Turntables require a particular frequency response and the input needs to be correctly equalised to accommodate this. If your amp had phono inputs these would be equalised internally.
Unfortunately, many modern amps no longer have phono inputs. There are two possibly three options.
1) You could obtain a turntable that includes built in Phono eq
2) As 'radio head' says, you can obtain in line active equalisers. These are called RIAA Equalisers (Equalizers if you're in the US) or RIAA preamps. This allows you to plug your turntable into a small box, then plug the box into one of the audio inputs on the back of your amp.
3) You may be able to adjust your mixer to the required frequency response and use it as a preamp.
What you cannot do, regrettably, is just plug your turntable into an ordinary audio input. It will not do any harm if you want to try it and it will make a noise, but you won't like it!