User manual – Glass Clock Design #3
rev 1.2
The tubes used in this clock are Russian (Soviet) military tubes. The Soviets,
seeing the Western Nixie, came up with their own versions with similar sizes and
shapes. Unlike the U.S. Tubes they were manufactured well into the 1980's. Since
the collapse of the Soviet Union, these tubes became available on the surplus
market, possibly from old warehouses of obsolete electronic equipment. This
clock contains the IN-14 series of tubes. One interesting feature is the '5' digit. It
is actually the '2' digit upside down and reversed, making for a very unique
looking '5'.
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