[ASK] Buzzing/Noise when i plug my cord to the amp (without the guitar plugged)

My guitar buzzing/hum/noise but it's gone when i touch the metal parts of the guitar/cord. at first i thought it was bad grounding, but i've resoldered everything and the problem still persist.

and now i realized something:
1. I turn on my amp - no buzz
2. I plug in my guitar cord (not plug the guitar yet) - BUZZING
3. I plug the guitar cord in to my guitar - BUZZING reduced (but still buzzing until i touch the metal parts it's gone)

So is this normal to buzz when the cord connected to the amp without the guitar?the buzz is loud.

So is this normal to buzz when the cord connected to the amp without the guitar?the buzz is loud.

Of course it is. A cable without termination is a noise magnet.

Normal. Stratocasters and Telecasters also buzz slightly when plugged in, single coil pickup issue. A lot of buzz is bad, wire issue or electrical issue. Lights and fans and electric motors in the same room as guitar and amp will make noise.

Yes, sadly this is normal - but doesn't have to be ...

A cable into an amp without the guitar (or FX pedals) is "unterminated" - the input jack is shorted closed without the plug in it and that shuts the amp up. An unterminated cable in the jack will cause a loud buzz because the input is wide open and it is high-sensitivity.

What is of minor concern though is that it buzzes with the guitar attached, that is not /supposed/ to happen although it often does, and when it does occur then touching the strings or other metalwork on the guitar will lessen the buzz. A /slight/ buzz is acceptable especially with single-coil pickupses.

Unfortunately this is a problem with the amp. Probable cause is is wiring and board layout.
Note - mine do not have an unacceptable buzz and touching the strings makes little or no difference - because either the amps never buzzed, or I have fixed them.

Do check the earth, or get it checked. It is a safety feature, but a poor earth will also buzz.

From the input jack sleeve/chassis to the mains earth pin shoud be less than 0.1ohm+R where R is the resistance of the lead (estimated) i.e. very low.

Okay I've changed my cord and it's significantly decrease now.
only heard a little hum, and i guess that's at normal level (not very loud as before).
but the hum is gone when i touch the metal parts. can this be fixed?

it's annoying to hear the clicking sound,after let go a string, then touch it back, i can hear the clicking sound (grounding). I've turn off all the florescene lamp/laptop/tv everything in the room..but the slight hum still there.

I heard that shielding will prevent this EMI or stuff, but in this case i guess it's not that?since i've turn off all electronic in the room..and it still hum and gone when i touch the metal parts.

I've resoldered everything (using stock vintage wiring, no wire from the pots to the body cavity), and here's a pic:

http://i1132.photobucket.com/albums/m561/slianto/IMG02863-20120125-1503.jpg

Any appliance on the same circuit as your guitar can cause it.

It doesn't have to be in the same room.