Vacuum Tubes - The Triode & The Multipurpose Tubes - 1943 US Army Training Film

This short training film tells you about vacuum tubes - the main component of electronic equipment in the first half of XX century.

What is triode? How it works? What does this vacuum tube consists of? Where it was used? What is grid control? Why plate current needs it? How to control current in vacuum tube? Why it needs screen grid? How to read electronic schematic with vacuum tubes in it? How do electrons flow in vacuum tube? What is electron emission? Answers on these and other questions with excellent illustrations are in this film.

Timeline:

00:00 - What vacuum tube consists of?
02:05 - Grid Bias in Triode Tube
05:07 - Control Grid of Triode Vacuum Tube
06:50 - Amplification
11:54 - Penthode Tube and Suppressor Grid