This particular project was designed to showcase Numitron tubes, which are still available for a reasonable cost on eBay from old Russian cold war stock. As stocks (rapidly) dwindle, their cost increases steadily until they will be gone forever. Don't miss out on this opportunity to build a useful project showcasing this beautiful cold war era component. The Numitron is not a traditional tube (valve) in that there is no electron emission involved; it only has filaments, and as such is more analogous to the light bulb than any other electrical device. Seven small filaments are arranged in the traditional formation of the seven-segment LED numerical display we are all familiar with, all within a simple glass tube. The particular Numitron used in this project (the Ⅳ-9) operates on five volts at about 23 mA per segment. It has "fly leads" and as such does not require a difficult socket.
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