Check the motor shaft. It could be bent making the pully wobble which makes the whole turntable vibrate which gets passed through the needle. I just found this out on mine. Easy way to test is to hold the platter while the needle is resting on the record. The speakers will hum/wobble at a low frequency. Lift the needle off the record and the sound stops? It's the motor...
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The hum of course is the 60 cycle line AC voltage. Make sure that the routing of the AC power plug is as distant as possible from the stereo RCA cables.
The most likely problem is the connection of the phono cartridge to the wires in the arm. These connections usually are silver plated and become oxidized creating a bad connection. Remove the cartridge and using a fine eraser polish the connections. There is a ground connection that makes the five wire connection. Be super carfull these terminals are very easy to break
The phono connections to the stereo is very low voltage subject to interference. The connection to the magnetic pickup at the tone arm is low impedance and is inductive. Any poor connection between the cartridge up to the AV316 will produce this hum. Continue to check connections and swap cables with a known good to resolve.
I have switched the left and right cables to ensure that the cable is not the problem.
A grounding wire is just a piece of wire connected to an earth point on the deck, connecting to an earth point say on a radiator pipe. There's nothing special about this wire any old piece will do. You only need it if you get a hum noise when the turntable is connected to the amp.
Hello! Did you connect single black ground wire to the "ground" terminal at your amp? Probably not! Or, it got stepped on it, while moving around. Professional of hi-fi turntables using magnetic cartridges and require 2 well shielded audio cables, connected directly to the cartridge, plus separate ground wire, which attached to all the metal parts of tone arm and body. Failure to connect this wire to the body(metal) or the amplifier, will cause this loud "hum". thanks, Alex.
To test the wires are working. Connect the deck to the amp and turn the amp on. Normal volume will do.
Before that disconnect all the wires to the cartridge.
Now with the amp on, touch each of the wires one at a time with your finger. On two of the wires you should hear a buzz, one on the left, one on the right. You might hear a slight hum or crackle on the two other wires or nothing at all.
If you don't hear any loud buzz on two of the wires, then the wires have become disconnected somewhere or the inbuilt pre-amp inside your amp has failed.
If you hear buzz on both channels you have either bad connections to the cartridge or the cartridge has failed.
3 things to check: First, do you have the turntable grounded to the Stereo receiver, if not, make sure you do. Second, what kind of Audio cable interconnects the two pieces of electronics? Should be a very good balanced cable like Monster ILN or Phoenix Gold, or ProFlex. That alone can cause major noise. Third, Are you using a good power/line conditioning surge? Panamax, Furman,Monster all make very good line conditioning surge units. You've got an AC humm, it can be caused by just about anything in your home from a bad light bulb to a loose common wire in any AC outlet. LP's will amplify any kind of noise that's not heard on other devices. Chances are if you tune your receiver to AM you will hear it as well. Hope this helps.
HAVE YOU GOT ANY OTHER EQUIPMENT CONNECTED IF SO DISCONNECT THEM THEN JUST USE THE AMP,DECK AND SPEAKERS AND MAKE SURE THERE IS NOTHING ELSE PLUGGED INTO THE SAME CONNECTING LINE
THEN ADD THE OTHER ITEMS ONE BY ONE