[Amps] filament forces TSPA

[R L Measures]

On Aug 27, 2006, at 2:34 PM, John T. M. Lyles wrote:

> Rich
> What is the estimated current

Enough to melt 28ga. Cu wire -- which seems incredible to me.

> and the subsequent
> force generated to do this pushing of filaments?

When Karina and I were in the business of straightening bent  
filaments in fil-grid shorted 3-500Zs, it took 11g for 30 to 40  
seconds at 5.8 filament V to straighten out the filament.

cheers, John
> 73
> John
> K5PRO
>
>> .... the filament does not sag, rather it is pushed sideways  
>> toward the grid--
>> presumably by EMF from the large flow of grid current during the
>> parasitic.  The amount of this current is anybody's guess, but it's
>> enough to do damage
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R L MEASURES, AG6K. 805-386-3734
r at somis.org