On 11/12/2011 5:55 PM, Brenda Ann wrote:


wrote in message
...


As far as I know- none of the satellites are using vacuum tubes .
That's the reality .


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All satellites still use these for output:

http://en.wikipedia.org/wiki/Traveling-wave_tube

Fact of the matter is, you don't need tubes in space, you already have a
much better vacuum than can ever be created on earth ... you simply need
the elements ...

Regards,
JS