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Path: utzoo!watmath!clyde!burl!ulysses!allegra!alice!ark
From: ark@alice.UUCP (Andrew Koenig)
Newsgroups: net.audio
Subject: Re: cables and ground loops
Message-ID: <4043@alice.UUCP>
Date: Tue, 23-Jul-85 17:11:38 EDT
Article-I.D.: alice.4043
Posted: Tue Jul 23 17:11:38 1985
Date-Received: Thu, 25-Jul-85 04:06:54 EDT
References: <379@ucdavis.UUCP>
Organization: Bell Labs, Murray Hill
Lines: 9

> My reason for asking is that I have a Hafler 200 amp with what I *believe*
> to be a ground loop problem.  The amp is completely quiet as long as only
> one input channel is connected to a source, but starts to hum slightly
> as soon as both are connected to the same source.  This seems to happen
> regardless of the source (or cables) used.

Try disconnecting the shield of one, but not both, of your connecting
cables.  If this makes the problem go away, it was a ground loop
and you have fixed it.  If not, it's probably something else.