21 Jun
2004
21 Jun
'04
6:48 a.m.
From: "der Mouse"
<mouse(a)rodents.montreal.qc.ca>
Hi
Even with all the solar wind, the surface of the moon has
a much harder vacuum than any of the tubes we have on Earth.
The moon does have a problem for such devices. That problem
is dust. It could be blocked with filters but that is another issue.
There was an idea some time back that if we ever
get to the moon that
we could be using "open-air" valves (tubes) in the vacuum there for
high powered devices
Is the "open-air" vacuum on the Moon a hard enough vacuum for
vacuum-tube technology? Does it depend on whether it's day or night
(and therefore whether there is solar wind pouring in)? I know that
_some_ vacuum-tube technology - notably CRTs - depends on electrons
having a mean free path well over the tube size, and that needs a
pretty hard vacuum. - with the benefit that goes with the better
radiation resistance
that goes with valve technology.
Is it valves that give you rad-hardening, or size? A transistor the
size of a valve would, I suspect, be inherently pretty rad-hardened.
(Certainly the largest transistors I've seen are far smaller than the
smallest valve I've seen. Probably by about an order of magnitude,
once you strip each one down to the operating portion.)
> It would be quite cool to watch a tv picture on an open CRT methinks.
It would take less energy since much is lost by the thickness of the
Phosphor.
Dwight
Possibly, though it would mean either suiting up or building the screen
into a wall. :-(
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