John T. M. Lyles wrote:
>Our klystrons and triodes/tetrodes are
>pumped to 10^-6 or ^-7 Torr.
Here's an interesting figure to throw into the discussion: at that
pressure (10^-6 to 10^-7 mm of mercury) the so-called "vacuum space"
between the electrodes of a typical amateur-size transmitting tube will
contain 10^10 to 10^11 atoms of gas!
73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.demon.co.uk/g3sek
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