I recently purchased some nixie tubes on Ebay, which are vacuum tubes with numeric filaments (0-9) that light up depending on the pins the voltage is applied to. It's basically a crude digital display. My father knew these as pixie tubes, I was wondering:
Your dad misremembers. You have a Nixie tube. A Pixie tube has a plate with stencil icons inscribed in it, which are lit up by electrodes behind them.
They are both gas discharge tubes however.
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