Very few tubes use BeO2 and that includes the pink ceramic. It is just
another ham myth.
Those tubes that do use it are not dangerous unless you start grinding it.
BeO2 is used as the insulator between conduction cooled tubes and their heat
sink.
Arcing on a ceramic tube can be caused by contanimation on the suface
deposited on the ceamic by electrostatic means. It is similar to the way HV
cables attract dust such as on CRT's.
A regular PM schedule of cleaning insulators, tube fins and blower impellers
in a dusty enviroment will extend tube life.
Carl
KM1H
----- Original Message -----
From: "peter chadwick" <g8on@fsmail.net>
To: "John Farber" <kg6i@comcast.net>; <amps@contesting.com>
Sent: Saturday, August 31, 2013 4:12 AM
Subject: Re: [Amps] What causes arc over on the BeO2 ceramic insulator ofan
8877?
John,
Are you sure the ceramic insulator in an 8877 is BeO2? It is not mentioned
in the data sheet, and generally, where BeO2 is used, the fact is
mentioned because of the problems of dust.
73
Peter G3RZP
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1432 / Virus Database: 3222/6126 - Release Date: 08/31/13
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|