neon glow lamps (was TTL homebrew CPUs)

Tony Duell ard at
Thu Jul 12 16:52:02 CDT 2007

> You can also look out for tetrode thyratrons - these have an extra electrode
> that can be used to control the trigger point to some extent. The are
> available as heated and cold cathode versions.

IIRC, the very common 2D21 (EN91 in Europe) is a hot cathode tetrode 
xenon thyratron.


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