Bryce, yeah, I'll work in high vacuum.
Don, thanks for the book suggestion, I'll try to locate a
should improve my understanding quite a bit.
Bob, I am not entirely sure that has to be right. I've
Krasnow make an SEM from scratch - plates and all - and he
used an SEM
filament bought off ebay. He handled it in normal air and
re-pressurizes the chamber every time he places a new
object to scan.
Maybe the filament he's using is coated with something
Regarding whether people will know what an electron gun
technology and old scopes got so cheap by now that one is
seemingly able to build complex stuff, such as SEMs, and
electron gun based devices at home. I'd say once you can
stuff the interest rises sharply.
Fred, I wouldn't like to hijack this thread :^) but let's
this a trip down memory lane (just yet). But to placate
Germany you can walk into a Conrad shop and buy a new CRT
lacks a lot of features compared to a 7104 with the best
and amps, but it's got a good old CRT.
On Thu, May 16, 2013 at 9:14 AM, magnustoelle <magnustoelle@...>
> Hi Steve,
>> They are still used in X-Ray tubes and electron
>> Another question: Will anybody know why analog
scopes needed a delay line?
>> - Steve
> A delay line allows the time base to start sweeping
before the +/- VERT signals reach the CRT. I always
considered it as a helpful trick for good viewing
performance when probing faster signals, so that one path
would be allowed more time. The delay line has some
disadvantages regarding high speed signals. Not seen more
than 100..150 ns delay or similar. Pre-trigger circuits
made delay lines obsolete as it seems.
> Kurt has a nice, related description on his fine
webpage here: http://w140.com/tekwiki/wiki/111
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