Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site oddjob.UUCP
Path: utzoo!watmath!clyde!cbosgd!ihnp4!gargoyle!oddjob!paluzzi
From: paluzzi@oddjob.UUCP (Greg Hajek)
Newsgroups: net.audio,net.micro.mac
Subject: Re: "Ultrasonic" hearing
Message-ID: <1115@oddjob.UUCP>
Date: Tue, 14-Jan-86 23:06:20 EST
Article-I.D.: oddjob.1115
Posted: Tue Jan 14 23:06:20 1986
Date-Received: Fri, 17-Jan-86 02:15:28 EST
References: <1280@brl-tgr.ARPA> <590@harvard.UUCP> <11370@ucbvax.BERKELEY.EDU> <251@birtch.UUCP>
Reply-To: paluzzi@oddjob.UUCP (Greg Hajek)
Followup-To: net.micro.mac
Distribution: net
Organization: U. of Chicago, LASR
Lines: 27
Xref: watmath net.audio:7153 net.micro.mac:4089

(To net.micro.mac readers:  this has been an ongoing discussion in net.audio,
 but as this posting is a bit of a digression from audio talk, I have directed
 followups to n.s.m.)

In article <251@birtch.UUCP> oleg@birtch.UUCP (Oleg Kiselev) writes:
>>     I've never encountered a TV receiver or monitor that
>>didn't emit an annoying high pitched squeal at at least a
>>low audible level.
>
>I have heard it is usually the vibration of transformers and/or capacitors
>(fly-back transformer?????). THe worst offenders I have heard were 
>tvi925 . Sometimes a sharp rasp on the side of the terminal would silence
>it for an hour or so ( and many people got so irritated by the squeal they
>did it routinely).

I have had the same problem with my Mac, and also found that the "sharp rasp"
(read: "swift kick") solution is usually effective.  Why is this?  I never
had the problem before I blew my power supply, and had to replace the analog
board.  Can anybody suggest a possible solution (or a reason why this problem
would suddenly crop up, for that matter)?

-- 
"God lives in Eternity...He doesn't have to listen to Two-for-Tuesdays."

Greg Hajek
U. of Chicago           ...ihnp4!gargoyle!oddjob!paluzzi
Laboratory for Astrophysics and Space Research