Philips gemini  XL-500 II Turntable Logo
Posted on Nov 16, 2008

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.

I have Origin Live Aurora turntable and Origin Live Encounter tonearm with Clearaudio Virtuoso Wood cartridge. When I lift record off the turntable, a very loud sound (60-100 Hz) comes out of speakers. So I always reduce the volume considerably to change the record. The tonearm wire is properly grounded to the phono preamp ground terminal. I also tried to ground the chassis by connecting a wire from tonearm base to ground receptacle of AC plug. All failed to solve the problem. The worst part is there is a very loud pop once in a while during the play especially in winter. The humidity in the room is 60 - 65%. I'd appreciate your suggestion.

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d0wnl0ad

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  • Posted on Jul 07, 2009
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To me it sounds like there is a problem wth the wiring from the tonearm i would check that all your connections are firmly sodered in place it sounds like there is just a loose wire that is losing its ground connection.

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  • Posted on Nov 30, 2008
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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
DEREK

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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

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.

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