Does anyone know if limiting the in-rush current during a pre-heating period for a 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?
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