> On February 17, 2018 at 11:57 PM Steve White <steve.white1@xxxxxxxxx> wrote:
>
> Does anyone know if limiting the in-rush current during a pre-heating period
> for an 833A filament will extend its life? I looked in many 833A data sheets
>and in only one did I find any mention of limiting filament start-up current.
> The Machlett 833A data sheet states a maximum filament current of 20 amps.
> If it will extend the life of the tube I can easily use a resistor to make
> a pre-heating circuit. Right now for my Amperex 833A VTTC, I just switch the
> filament on with 10 volts with no pre-heating. Any thoughts?
As a matter of physics, limiting the current will increase life. Without
more data can't say how much reduction would provide how much more life.
best
dwp
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