The IN-28 is a top view Soviet neon display tube designed to be used as a single dot indicator in large tiled displays. Large numbers of IN-28 tubes would be chained together to form segmented and dot matrix patterns with each tube acting as a single pixel. The IN-28 uses the same size envelope as the popular Soviet-made IN-4 nixie tube but is equipped with a different base, a 7 pin flying lead type that required the tube to be directly soldered into the target device. The IN-28 is very bright, and displays built using this tube have excellent visibility.
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