Question about Sony PS-LX350H Turntable

2 Answers

50Hz noise appears at the end of the disc

When the tone arm gets towards the end of the disc, there is a loud 50Hz hum coming through the amp & speakers. At the begining of the disc everything is quiet. Everything is earthed correctly and this problem started one day quite suddenly. Sony dealer says this is too old to be economically repaired; anybody got any good ideas? The deck is only a few years old.

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  • timmyketeer May 11, 2010

    What brand of cartridge are you using?

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2 Answers

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  • Sony Master
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Because the tone arm travels through an arc, it could be that shielding that should have continuity from the pickup shielding (which may be internal to the cartridge) through the tone arm and ending at the preamp input may be interrupted at the inside of the arc.
If you can see contacts at the back of the pickup (there should be a minimum of three, sometimes four) you may be able to see the shield mesh. If you have a meter, you might try carefully connecting a small clip-on probe (electronic stores will have 'mini probes') to the shield, then put the other meter lead on any bare metal of whatever amplifier receiving the signal and then move the tone arm through its arc to see if the continuity is interrupted at the inner part of the arc. 
Cartridges with 4 leads are generally Left, Right, shield, and a ground. If it is so configured, then the shield and ground leads will be connected at the connector on the amplifier end.    

Posted on Oct 02, 2008

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  • Master
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The needle or arm is going bad, try this put a penny on the head and play, any difference? we used to do this as kids

Posted on Oct 02, 2008

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1 Answer

I get an intermittent loud hum using NAD AV316 amplifier, with stereo speakers(B connection) with phono input from Dual 606 turntable. Hum increases/changes when tone arm on turntable is touched.


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

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