Why would a guitar amplifier emit a loud humming sound whenever you touch your thumb to the tip of the phone plug?

Because the amp is amplifying the sounds all the cells your body is making :O







no not really, i dont know why, but they just do that xD

because you have excess charge stored up on your body?

Don't worry, nothings wrong, and its not your guitar that's causing that. The amp reads electric signals sent from the guitar through the cord, your body has electricity in it so the amp picks up that which is what causes the humming noise. This is completely normal for any sort of amp, so you have nothing to worry about, just don't go doing anything stupid like pressing the lead on different parts of your body to see if the sound changes:heh: