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Path: utzoo!watmath!clyde!bonnie!akgua!mcnc!ncsu!ncrcae!jdg
From: jdg@ncrcae.UUCP (Jim Griggers)
Newsgroups: net.consumers
Subject: Re: are ion generators bad for machinery and other living things?
Message-ID: <2211@ncrcae.UUCP>
Date: Wed, 29-May-85 08:49:28 EDT
Article-I.D.: ncrcae.2211
Posted: Wed May 29 08:49:28 1985
Date-Received: Fri, 31-May-85 03:05:59 EDT
References: <4147@allegra.UUCP> <2221@sun.uucp>
Reply-To: jdg@ncrcae.UUCP (Jim Griggers)
Organization: NCR Corp., Columbia, SC
Lines: 15
Summary: 

In article <2221@sun.uucp> sunny@sun.uucp (Ms. Sunny Kirsten) writes:
>Most CRT's have the
>cathode at a very high negative potential and the phosphor grounded to
>minimize this effect (as you wouldn't want to get a serious shock from the
>alternative arrangement of putting the cathode at ground potential and
>raising the screen to a large positive potential). 

As a EE with quite a bit of experience with CRT design, I have *never* seen
the cathode put at a high negative potential while the anode is grounded.
I think if you check, your SUN and other CRTs run a second anode potential
at around 12kv to 20kv, with the cathode grounded (or near ground ).  This
makes the circuit design in driving the grids or cathode with video
information much easier.  Remember, there is about a quarter inch of glass
between the phosphor an the front of the tube which is enough to prevent
a shock hazard.