neon glow lamps (was TTL homebrew CPUs)
dkelvey at hotmail.com
Thu Jul 12 21:59:21 CDT 2007
>From: ard at p850ug1.demon.co.uk (Tony Duell)
> > You can also look out for tetrode thyratrons - these have an extra
> > 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
I've seen these but what I was talking about was a three lead in
a NE2 type package.
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