Hello, I just found this site/forum a couple days ago and have been reading up and trying to understand - great stuff ;D
I have been searching for months for the answer to this question. I think I understand how a ground works now and why touching the strings lessens the noise.
Here's the issue. I have an archtop guitar (Eastman 805ce) with a single pickup and only a volume control (no tone control). This guitar has been fine through all amps I play through except one - a Roland Cube 30. This am only has 2 prongs on the plug while all other amps I have tried have 3 prongs. When playing through the Roland (2 prongs) I have a ground hum problem the is solved by touching the strings, and the hum gets louder as I turn down the master volume. It is also louder when my hand is near the volume control vs. when my hand is not near.
I think the strings are grounded because the tailpiece is metal and not wood, and I've read that solves the grounding problems with some archtops?
I'm fairly new to this so I am guessing there is a simple answer but form everything I have read I cannot find it. The main confusion is that I have no problems except with this 2 prong amp. Oh and by the way no other guitars have the problem with this amp.
Does this sound like something that is fixable maybe? It's been driving me nuts!
Post by stratatouille on Oct 21, 2007 8:20:31 GMT -5
"This am only has 2 prongs on the plug while all other amps I have tried have 3 prongs. When playing through the Roland (2 prongs) I have a ground hum problem the is solved by touching the strings, and the hum gets louder as I turn down the master volume. It is also louder when my hand is near the volume control vs. when my hand is not near."
I am pretty new to all this, but I have wondering if it is curious that you only has this problem with the two prong. Some two prong are from before plugs had one wider blade to make sure grounding is proper.
Is the two prong may be old, with two prongs of same size? If so, I wondering if you "flip" the plug will help. I has heard of this before.
Hopefully maybe the grounding issue is as simple as that?
I draw "flip" so you can see how you will rotate 180 degrees so that you are now putting the blade that was in right in left and versa.
L R (is) X R L (try)
ATTENTION: IF IT IS a modern plug that can only go in one way, DO NOT ATTEMPT this and DO NOT MODIFY the plug in any way. Modern plug is already correct grounding built into it - is why the one prong is wider than the second prong. That much I know.
I hopes it help.
Edit: P.S. I doubt this will applies either, but does the amp happen to has a polarity switch on the back, by any chance?
Last Edit: Oct 22, 2007 8:37:51 GMT -5 by stratatouille