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it may not be feedbacl, but ground hum. make sure the turntable is grounded. the turntable should have a ground wire with one end stripped. Bend the stripped, bare wire into a u shape and hook it around the ground screw of your receiver and tighten it down. If your turntable is already grounded, it may be feedback. you may have speakers too close to the TT or your volume is too high
Try connecting the turntable to one of the other inputs like CD / tuner etc and see if the buzzing disappears. if so then your turntable has a built-in pre-amp so it can be connected to any input except 'phono' as this would obviously be used for turntables without a pre-amp. a lot of modern turntables now have built-in pre-amps to compensate for certain amps and receivers made without a phono input and can now be connected just like a CD player, tuner etc.
This problem is usually caused by the turntable(s) being too near the loudspeakers - a sort of "howlround" effect if you like.
Make sure that the speakers are as far away as possible from the decks and that your cartridges are set up correctly too. On the back of the turntables, there should be a connection for a ground wire, but that should have nothing to do with this situation.
Hope this has helped, and good luck! (:-)
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.
Possibly check the wires on the cartridge, make sure none of them are touching and are not bent to badly, are all the connections tight? some cartridges require plastic sleeves over the connections, this insure they don't touch and avoids resistances between them. Also some cartridges are not compatible with certain model turn tables.Is it universal? Also you my need a mixer most turntables don't work with amps alone. Mine don't. Usually most models you attach the ground wire to the mixer. A mixer boosts table power and take stress off the amp. Hope this helped! good luck!
This is a tonearm issue. Your tonearm probably has a loose ground connection, or if you moved it recently, may have been damaged in transit. Also, try and move your turntable to a different location in the room. If your near any serious power source (light dimmer switch, microwave, frig, etc), it will only amplify the issue. But other than that, it sounds like a common tonearm issue, and you will need to have your tonearm replaced.