18 Jun
2006
18 Jun
'06
7:56 a.m.
Hi,
Chuck Guzis said:
(Point of curiosity: In British English, when is a tube a valve? You
fellows don't talk about "Cathode Ray Valves" do you? Is a
photomultiplier
tube a "valve"? How about a TWT?)
Photomultiplier tube and travelling wave tube is the norm over here in
my experience. The term "valve" is more of a function thing by analogy
with a valve controlling the flow of liquid, a thermionic valve is used
to control the flow of electrons. OK, so a crt controls the flow of
electrons, but it's primary funtion is to display the result, in fact you
could argue that a crt contains a valve :-)
--
Cheers,
Stan Barr stanb at dial.pipex.com
The future was never like this!