[R-390] A Primer on Vacuum Tubes

[Jacques Fortin]

Both Patrick Mitchell writings are available on the Valve Museum site and linked to each other:
Go to: http://www.r-type.org/articles/art-222.htm
The "History of the Grid" is a little more expanded there than in the original Electronics World (that was Wireless World before) publishing.
Just click on the blue texts to see those "expansions".

Good reading to all !

73, Jacques, VE2JFE in Montreal