How to quiet near ultrasonic noise from H-19a terminal ?

Article View: comp.sys.zenith

Article #591

#591

From: Mark Becker
Date: Thu, 18 Apr 1991 02:33

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Hello -

Nearly nine years ago I built an H-19a terminal.  And I'm still using
it with an old CP/M system.  One of the most reliable pieces of com-
puting machinery I own.

However... the whine from the flyback transformer is starting to drive
me up the wall.  It is extremely LOUD.  Loud to the point where my
teeth hurt whenever I switch the thing on.  As it's right at the edge
of my range of hearing, it also makes my ear ache.

Others must have run into this problem before.  What have YOU done to
quiet the transformer?

Your help appreciated.

Regards,
Mark
+-----------------------------------------------+-----------------------+
| Mark Becker					| .signature under	|
| Internet: mbeck@ai.mit.edu			|	construction	|
+-----------------------------------------------+-----------------------+

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!think.com!mintaka!bloom-beacon!dont-send-mail-to-path-lines
From: mbeck@ai.mit.EDU (Mark Becker)
Subject: How to quiet near ultrasonic noise from H-19a terminal ?
Message-ID: <9104180233.AA27872@rice-chex>
Sender: daemon@athena.mit.edu (Mr Background)
Reply-To: Mark Becker <mbeck@ai.mit.edu>
Organization: The Internet
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Date: 18 Apr 91 02:33:24 GMT
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