Question about Sony PS-LX350H Turntable
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.
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
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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Posted on Jan 02, 2017
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