[Amps] Miller-Larson effect on thoriated tungsten filaments

[Carl]

I doubt if that has much effect on our low power tubes Mike but the "boys" 
with the 10-20KW rigs might be interested.

I also never had to replace any of the WW2 era TX tubes while in the USN and 
those were cycled on only when necessary.

Much ado about nothing for this forum. When was the last time you saw a 
3-500 with a bad filament?


----- Original Message ----- 
From: "Mike Waters" <mikewate at gmail.com>
To: <amps at contesting.com>
Sent: Tuesday, June 25, 2013 12:32 AM
Subject: [Amps] Miller-Larson effect on thoriated tungsten filaments


>I discovered some new (to me) information on maximizing the life of
> amplifier tubes with thoriated-tungsten filaments. I just uploaded it to:
> http://www.w0btu.com/miller-larson_effect.html
>
> Basically, every time the tube filament passes through a certain
> temperature range as we turn it on (or power it down?), we shorten the 
> life
> of the filament, due to the Miller-Larson effect.
>
> I would appreciate any comments on it, good or bad.
>
> 73, Mike
> www.w0btu.com
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