Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83 v7 ucbtopaz-1.8; site ucbtopaz.CC.Berkeley.ARPA
Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!houxm!houxz!vax135!cornell!uw-beaver!tektronix!hplabs!zehntel!dual!amd!decwrl!decvax!ucbvax!ucbtopaz!newton2
From: newton2@ucbtopaz.CC.Berkeley.ARPA
Newsgroups: net.audio
Subject: Re: Installing a Varistor
Message-ID: <522@ucbtopaz.CC.Berkeley.ARPA>
Date: Wed, 8-Aug-84 03:34:41 EDT
Article-I.D.: ucbtopaz.522
Posted: Wed Aug  8 03:34:41 1984
Date-Received: Sat, 11-Aug-84 03:38:30 EDT
References: <582@uofm-cv.UUCP>
Organization: Univ. of Calif., Berkeley CA USA
Lines: 6

It's unlikely a varistor will help deal with RFI, whether conducted or radiated, from a universal motor. Try experimenting with the physical arrangement
of power cords on the audio equipment, with lifting some AC power grounds,
or with other ground-loop breaking approaches. Shielding (foil) may help
in the less-likely event that the interference really is radiated rather
than power-line conducted. Remember that AC power cords make effective antennas (they're actually used for such in radios). Good luck with a frustrating
and elusive problem.