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Limiting the inrush current to anything that heats up seems like a good
idea. Most damage to paleolithic (incandescent) light bulbs occurs
during the current inrush period. (Did you know that the life of an
incandescent bulb is inversely proportional to the thirteenth power of
the applied voltage? A sobering thought.) Besides, if anyone knows
what they are doing, it's Machlett.
How about a big varistor?
--- Carl
On 2/17/2018 9:57 PM, Steve White wrote:
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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