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-   -   Turntable humming. (http://www.diyaudio.com/forums/analogue-source/210964-turntable-humming.html)

Ben cvt 17th April 2012 03:59 PM

Turntable humming.
 
I just purchase a turntable rega rp1 and rega fono mini a2d, I connect to my tube amp and buzzing sound is appear on my speaker. I try to connect other source to my amplifier, there's no any buzzing or humming sound, so I know the freak sound is not from my amplifier.

I read the menu of my turntable, I have noted that the arm earth is automatically connect through the arm cable screening,so earthing is unnecessary.

What can I do now?Please help... Thank you!!

Osvaldo de Banfield 17th April 2012 05:35 PM

May be two causes: one: if it have internal electronics, may be a fake capacitor in the power supply. Two:, if not one, there may be a cut cable in the ground return, perhaps the ground one, or the shield. Check wiring with a simple VOM.

Ben cvt 19th April 2012 07:16 AM

Hi,
I already test my turntable with my friends phono, the noise is still there, I think the noise is from the tonearm.

I will send it back to the hifi shop that I bought this turntable .

Thank you
Ben

Palustris 19th April 2012 07:09 PM

"I think the noise is from the tonearm."

That is very plausible.

"I have noted that the arm earth is automatically connect through the arm cable screening,so earthing is unnecessary."

That could be your problem: there are several ways to do this and the most common way is to have the turntable grounded with a separate wire to the preamp; the interconnect cable would have R & L signal as well as signal ground; the shield would NOT be connected to the preamp, only on the turntable end so as not to have a ground loop.

sq225917 19th April 2012 09:04 PM

The black wire on rega tonearms is used as the earth wire which means the tonearm tube usually isn't earthed all that well.


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