I'm in the final stages of putting together a clock using INS-1 tubes for the colon dots. The dots alternate lighting every second. I'm using an ArduinoNIX as my power supply, cathode controller, and anode switches. Each of the INS-1 tubes uses an 180k ohm anode resistor. My problem is that one of the INS-1 tube works fine while the other starts it's glow at the top of the tube and then it moves to the base of the tube. Is this common for INS-1 tube or have I just got a bad one?
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