Based on the date-codes on my Soviet tubes, some of them as recent as 1992, I think an extreme oversupply was created as demand fell-off in favor of newer devices, such as LEDs. My theory is that during the Soviet era, the government ran all of the manufacturing facilities and they kept cranking-out tubes even if there was no demand; they didn't actually need to sell those nixies to keep the factory running because the govt. paid for it. In contrast, nixie manufacturers in the US/ western Europe shut-down production as soon as demand went down, so massive stockpiles never resulted. Most of my Burroughs tubes were manufactured between 1963 and 1966, and perhaps a straggler from the early 1970's.
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