[Amps] Miller-Larson effect on thoriated tungsten filaments

[KA4INM]

On 06/25/13 00:32, Mike w0btu Waters wrote:

> 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.

   This is what makes 620 Watt flashing tower beacon lamps have a hard 
time lasting a year.  (and perhaps why there are two to a fixture)
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.