12 Jul
2007
12 Jul
'07
1:35 p.m.
From: "Tony Duell" <ard at p850ug1.demon.co.uk>
There were also some sloower ones called 'Trigger Tubes', which AFAIK
have no export restrictions (they are not suitable for that use, far too
slow) but can be used for logic, etc.
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.
Jim.
>
> > At one time one could get three terminal neon lamps. These could be
> > used for many logic functions reliably since they always had on
electrode
with ionized gas on it.
You still can. They are called Krytrons, are expensive, DAMN fast, and
are export controlled.