Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!husc6!think!ames!elroy!jplgodo!wlbr!scgvaxd!trwrb!sdcrdcf!burdvax!bbking!rmarks 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 References: <1495@frog.UUCP> <35ffa63b.b8ab@apollo.uucp> <6@spar.SPAR.SLB.COM> <1004@speech1.cs.cmu.edu> Organization: Unisys/Knowledge Systems Organization, Bluebell, PA Lines: 10 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