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From: rmarks@bbking.PRC.Unisys.COM (richard marks)
Newsgroups: sci.electronics,talk.bizarre
Subject: Re: "Magic Eye" tubes
Message-ID: <609@bbking.PRC.Unisys.COM>
Date: Tue, 14-Jul-87 12:07:00 EDT
Article-I.D.: bbking.609
Posted: Tue Jul 14 12:07:00 1987
Date-Received: Sat, 18-Jul-87 03:42:05 EDT
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Organization: Unisys/Knowledge Systems Organization, Bluebell, PA
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Xref: mnetor sci.electronics:980 talk.bizarre:2511

Yes, you are showing your age.  If you were a radio ham and had a goonie box
you would know what a magic eye tube was.

It is a special type of vacume tube that was looked at from the top.  It was 
about 1 1/4" in diameter and mostly glowed green.  The green was about the 
shade of our PC monochrome monitiors.  A pie shaped section of less than 90
degrees was not illuminated.  As the voltage changed, the angle of the pie
shaped section also changed.  They were usually used as a signal strength
indicator.  The smaller the angle, the stronger the signal.
Richard Marks K2LOU