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[Amps] filament instant heating query

To: <amps@contesting.com>, David Springer <dspringer@cfl.rr.com>
Subject: [Amps] filament instant heating query
From: Charles Harpole <k4vud@hotmail.com>
Date: Fri, 15 Jun 2012 03:59:12 +0000
List-post: <amps@contesting.com">mailto:amps@contesting.com>
to check on a supposition............

 

It appears possible that the sudden application of voltage to a tube filament 
causes degradation of the filament.

 

What seems to happen?  Is it possible that the very rapid heating of a filament 
could cause so much quick molecular action (rapid increased bouncing around of 
the molecules) that the shape of the filament could be changed?  A deformed 
filament could then be too close to other components to cause an arc, perhaps?

 

Or is the action on the atomic level...i.e., does heat change the actions of 
electrons in an atom?

 

But, maybe the filament rapid heating works just fine, and all of the "slow 
start" "inrush protection" circuits are a waste?

 

Another inquiring mind wants to know.

73,

Charles Harpole
k4vud@hotmail.com                                         
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