The issue is solved by a ground loop isolator but when I run input in to my
vcr I also get bars on the screen. I think I have a grounding issue in the
building. The voltage spikes when the AC on the other leg of 120v starts up.
It is not a 240v ac it is on a seperate circuit on a seperate leg. I would
call it a sperate phaze, but it is really just off a different tap on the
transformer on the power pole. Anyway I'm going in to too much detail. I'm
sure you know what I mean. I think I may need to drive another grounding
rod.


"tempus fugit" wrote in message
...
As for the hum, have you tried connecting bot stereo and computer to the
same wall outlet or power bar? Sounds like ground loop to me, and if so,
this should make it go away.


"Michael Kennedy" wrote in message
...
I have a old heathkit tube oscilloscope. It is a model I0-17. I was
wanting
to learn a little about it and how to use it. My biggest question is how
much voltage can a scope usually handle? This scope doesn't have any
probes.
Are there special probes for scopes that are different than those for
multimeters?

My first project I want to use it for is trying to find where I'm getting
a
buzz in my stereo. It will buzz if my computer is hooked up to and it is
grounded. If the computer is ungrounded it doesn't buzz. The stereo only
has
a two wire connector so it isn't groudned. I thought this scope could be
usefull in tracking down where the buzzing is coming from.. Anyhow I need
to
know if I can plug this thing into the wall (120vac) or if it will blow
up
if I do that.