My B&O RX-2 turntable with a MCC4 cartridge causes a loud hum thru the speakers (4 Pioneer CS-99A) The turntable is connected to a pioneer SX-3700 amp/receiver. The connection of the grounding wire to the amp reduces the noise approx only 20%. Noise is such, the music from the LP is barely discernable. Any thoughts on a cure?
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!
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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.
There can be two causes of this. The first is a detached or bad fitting earth connection on the cartridge or to the connection of the amp. The other is more serious. There could be a fault in the Magnetic Cartridge Pre-amp in your amp. This would not affect any function of the amp, since the only imput into it is the turntable.
You should check the connections to the turntable, it sounds like it might be feedback hum, caused by a wire touching or something like that. Don't forget to check the connections to the cartridge too.
It could be a bad connection of the earth pins to the cartridge. One turntable I had hummed even with an earth connection. I found out that the cause was the connection of the earth wire in a 3 pin plug.
Firstly does the receiver have a magnetic cartridge pre-amp built in? It will have to have a dedicated "phono" socket for this. If it hasn't you need to get one. The only other cause is a faulty cartidge. You can test this by removing the wires to the cartridge. By touching with your finger each wire, amp on of course, you should hear a loud buzz on two of them one for each channel. If you don't hear any buzz or it's still weak, even if the receiver has a pre-amp, then either the cables to the amp are faulty or the pre-amp in the amp is.
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.
Did you ground the turntable? Most of them have a ground wire located somewhere that connects to a screw on your electrical outlet. You could be getting hum from your pre-amp if it is a low quality one. Try unhooking the pre-amp, if that is the problem you won't hear the hum. If the turntable ground is the problem you won't hear music with no pre-amp but you will still hear the hum.
Yes first check is that the Gnd wire from your turntable is connected to the Gnd (ground) post at the back of your amplifier with a good clean tight connection. If the problem persists, check ALL your hi-fi components mains plugs for earth connections including your turntable, then remove the earth connections on all but one component so that you are left with only item earthed. What does sometimes cause problems is if 2 or more hi-fi separates are earthed and connected to each other the earth cables along with the hi-fi interconnects form an inductive loop that picks up interferance such as mains hum etc. Regards John