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In Reply to: 2A3, 300B, 45 all have semiconductor cathodes. posted by Mark Kelly on July 6, 2006 at 17:32:42:
....flaw in your reasoning. The color of emission is dependent not only on the filament material but also the temperature to which it has been raised, which in turn is dependent upon the current being run through it, which in turn is dependent upon the voltage applied, assuming the voltage source can maintain that voltage as current is drawn.So, one cannot diagnose the filament material by looking at the color unless one also knows the gauge and current. Conversely, if one knows the filament material and gauge, then one can use a spectrometer to assure that the filament is running at the correct temperature with the correct current flowing through it.
One must also be sure they're looking directly at the filament itself, not a coating or another structure. If one were able to focus in on the filament of a DHT, using a spectrometer, then one could, knowing in advance the filament material, determine the heat of the filament and by this know whether the tube filament is being operated within the correct paramaters for optimum thermionic emission and life.
Sorry, the spectrum you posted doesn't prove anything.
Nice try, though. Thanks.
"It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking a chance on me when I wanted to be an engine mechanic.
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Follow Ups
- thanks for the cool spectrum, Mark, but there is a..... - radiance 17:56:30 07/06/06 (1)
- continued apology for my really ignorant post....... - radiance 23:13:46 07/06/06 (0)
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