For Old Timers,

Great articles from Radio News, 1926-1928. Excellent pdf scans.

http://www.one-electron.com/Misc_Docs.html

Some Articles:

Chemical Condensers of Large Capacity - an article by Clyde J. Fitch
in the August 1926 Radio News. How to build your own electrolytic
capacitors. (394K pdf)

http://www.clarisonus.com/Archives/C...s/ChemCond.pdf

A New Electron Tube - an article by Sylvan Harris in the July 1927
Radio News about GE's development of the "Shielded-Grid" tetrode -
which evolved into the RF tetrode and pentode. (404K pdf)

http://www.clarisonus.com/Archives/T...GE_tetrode.pdf

The Shielded-Grid Tube At Last Arrives - an article in the January
1928 Radio News about the first American implementation of the
shielded-grid (i.e.screen grid) tetrode, the '22. (304K pdf)

http://www.clarisonus.com/Archives/T...SG_Arrives.pdf

Tubes Within Tubes - an article by G.C.B. Rowe from the July 1926
Radio News on Dr. Siegmund Loewe's multi-section tubes, from
Germany. These were truly the first integrated circuits, since not
only triodes, but passive components were enclosed in the vacuum
tube. (558K pdf)

http://www.clarisonus.com/Archives/TubeTheory/Loewe.pdf

Regards,

Mike Monett