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Re: [Amps] Pre-heating of tubes

To: craxd1@verizon.net, GGLL <nagato@arnet.com.ar>,amps@contesting.com
Subject: Re: [Amps] Pre-heating of tubes
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Sun, 30 Jul 2006 12:48:26 +0200 (CEST)
List-post: <mailto:amps@contesting.com>
Will said:
>Under 300 deg C which is just under where you can't see the anode turn red in 
>the dark, is where zirconium will not do any good at all, neither for hydrogen 
>or O2 and the others. These heat colors work for any metal, but not for 
>graphite. You can check them against any heat treatment or metalurgical chart.<

According to my book on heat rreatment (Hardening, Tempering and Heat 
treatment, Tubal Cain, Nexus  Special interests, ISBN 0 85242 837 5) in a dim 
natural light, 700 deg C is dull red, 740 blood red, 800 cherry red, 825 bright 
cherry red, 850 red, 900 bright red and 1000 deg C is yellow. Not to be 
confused with the pale straw through dark blue used when tempering steel. I 
would be surprised if 300 deg C can be seen, even in the dark - unless maybe, 
you are a pit viper!
73
Peter G3RZP
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