On 11/12/2011 6:59 PM, wrote:
On Nov 12, 8:55 pm, "Brenda
wrote:
wrote in ...

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

Oh,sorry. But this may be a miniature tube for microwave frequencies .
Where do they obtain high voltages - it must be smps type . Solar
panels??

NASA knows about voltage converters ...

Regards,
JS