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NIXIE

 
    
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The Nixie tube was a cold cathode numerical indicator tube. Each cathode was shaped into a digit, and when grounded the discharge would glow around that cathode and form the number by the orange glow.
The typical operating voltage was 125 to 150 Volts. Special TTL logic chips were made to directly interface to these tubes. They were popular in the 1970s for digital read-out of test instruments such as frequency counters.
The thin glass tube envelope is 17 mm in diameter and, excluding the base wires, is 45 mm tall.
Reference: Observation.

 

Updated April 07, 2013.
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