Image: Triody var
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Description: Various triode vacuum tubes in chronological order: RE16 (dated Jul 1918), REN1004, AC2, 6F5M, EC81.
Title: Triody var
Credit: Own work
Author: RJB1
Usage Terms: GNU Free Documentation License
License: GFDL
License Link: http://www.gnu.org/copyleft/fdl.html
Attribution Required?: Yes
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