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50 pieces of vintage dot nixie tubes IN-28 unsoldered tested
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. 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. Indicating current (no more than): 13mA. Keep-up voltage (no more than): 175V. Firing voltage (no more than): 240V. Diameter of the tube: 31 mm.
Made in "GAZOTRON" Plant in Ukraine.