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DECATRON CV2325 TUBE, 1960's
Decatron decade counting tube basically ten cold cathode tubes in one.
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A Decatron is a gas-filled tube. Dekatrons were used in computers, calculators and other counting-related devices during the 1940s to 1970s. "Dekatron," now a genericized trademark, was the brand name used by Ericsson Telephone. Internal designs vary by the model and manufacturer, but generally a dekatron has ten cathodes and one or two guide electrodes plus a common anode. The cathodes are arranged in a circle with a guide electrode (or two) between each cathode. When the guide electrode(s) is pulsed properly, the neon gas will activate near the guide pins then "jump" to the next cathode. Pulsing the guide electrodes repeatedly will cause the neon dot to move from cathode to cathode.