"Remi" wrote in message
. 76...
We just moved into a 60 year old house and discovered that my daughter's
electric guitar and amplifier won't work properly. There'a a loud hum
coming from the amplifier. It stops when she puts her hands over the
strings, but starts up as soon as she removes her hands. Could this be a
grounding problem? Any suggestions? (There's nothing wrong with the guitar
or the amplifier. She also has a bass guitar and a bass amplifier and the
same problem is occuring with them too). Thanks.

I suggest you perform a test on all your 3-prong electrical outlets and
classified them as grounded or un-grounded.

Using a $5 receptacle tester (those 3-prong thing with three lights) would
be a good start. If it says no ground, then you have no ground. If it says
normal, then it may be normal or someone may have connected a fake ground
(e.g. neutral) to the ground pin to pass the test.

Then, if you found some un-grounded outlets, consider adding a ground wire
or at least change them into GFCI.

This is a hassle but it increases the safety of your house, and possibly
make it easier to sell the house in the future.