[ARC5] Filaments - How Low Can You Go?

[J. Forster]

The Diffusion Rate for Solids is explained here:

http://en.wikipedia.org/wiki/Mass_diffusivity

As you can see, the diffusion rate (rate at which surface is repopulated
from the bulk) is strongly dependant on the absolute temperature. This is
a result of Statistical Thermodynamics, verified by experiment.

Best,

-John

===========



> On 19 Oct 2012 at 6:58, J. Forster wrote:
>
>> If you're worried about the filament burning out, operate the thing at
>> maybe 10% below design voltage. Lifetime is a power law of applied
>> voltage. That should lengthen the life a lot, but still maintain
>> emission.
>
> Eimac says no more than 5% low....but that is for power tubes.
>
> Ken W7EKB
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