Some Early Tubes and Circuits

Some early tubes and radio circuits from Radio News and BELL Telephone Laboratories.

searlytubes1926 1926_Radio-News__tubes-and-there-uses

higheffpa_1928_articlecover1936_BELL_Labs__high-efficiency-power-amp-for-modulating

fm_receiver  1940_Radio_News__design-notes-on-a-fm-receptor

 

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