On 1/20/2011 12:47 PM, JohnK wrote:
Think of the tubes acting a bit like a zener diode. [Or old-time valve regulators eg VR105 ]
They have a strike voltage, considerably higher than the sustaining voltage. Before they ionize and start to flow current, you need the B+ voltage at least that high to get 'em to ionize. Then they act like a zener at the sustaining voltage. The resistor in question is sized to get the desired current at that fixed sustaining voltage. Same as any neon lamp.
Same principle as fluorescent light tubes too for that matter. [And the reason for the Ballast] John K. ----- Original Message ----- From: "will" <ossumguyw...@gmail.com> " Does the resistance of the tube decrease significantly when you energize it or something?"
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