13 Jul
2007
13 Jul
'07
12:44 a.m.
On Thursday 12 July 2007 16:35, Jim Beacon wrote:
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.
Many of these tubes are listed here:
http://www.classiccmp.org/rtellason/tube.html
:-)
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
> > 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.