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Why is a 1.5-2 volt AC signal on my Neutral line?

I have several music sources e.g. DVD, Phono, DAC, Tuner etc...

I just purchased a NAIM integrated amp and I am experiencing a hum but only from the DVD player.

I have circuit tested the entire house wiring and all is well.

After a lot of investigation I found that some units have a 1.5-2.0 volt AC signal (sounds like a 60Hz signal i.e. hum) between the neutral side of the interconnect and the earth at the power bar.

Panasonic, Pioneer and Sony units I have measured all have this signal present and it varies between 1.5 - 2.0 volts

Luxman and Cambridge Audio gear does NOT have the signal present

All units have a polarized plug with no ground pin

How can the hum be eliminated using the Pioneer DVD with the NAIM Amp?

Thanks
williewonka

Showing 1 response by hifihvn

hifihvn
943 posts
 
You also need to measure the RCA neutral to the case of the
equipment for voltage difference.If it there,that could be inductive pickup from the case housing the transformer, especially in a power amp with a big transformer.If the difference is between the neutral and ground at the outlet, that just may be the load on the feeder causing a voltage difference.This may be normal when there is a load
on it.Like mentioned above,clarification is needed.The power bar may be all metal,and tied to the outlet ground.
I go with the more clarification needed also.
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