neon glow lamps (was TTL homebrew CPUs)

[dwight elvey]

>From: ard at p850ug1.demon.co.uk (Tony Duell)
>
> > 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.
>
>-tony

I've seen these but what I was talking about was a three lead in
a NE2 type package.
Dwight

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