Making a type C triode vacuum tube.
Captain H. Round of the British Marconi Co. designed the type C tube in about 1913. It is a triode that was meant for high gain high frequency use. No examples of the tube were available so some estimation was used in making the tube.

▶︎
making a miniature vacuum tube triode

▶︎
making a deforest spherical audion tube

▶︎
MAKING AN EDISON EFFECT LAMP

▶︎
TTT081 How Tubes Work

▶︎
The Art of Making a Nixie Tube

▶︎
1968 HOW VACUUM TUBES are Made: English Electric Valve Co EEV Television Radio Radar CRT Cameras

▶︎
Building a 1920s Tube Amplifier (And Tubes!)

▶︎
How did they make this in the 1800's?!

▶︎
The Mullard story

▶︎
German Pilot Tested A Captured Spitfire... His Words Shocked The Luftwaffe

▶︎
New Triode Design and Build

▶︎
Vacuum Tubes/Valves by Mullard ~Manufacture for Audio TV Radio

▶︎
Triode Building at Home: A Complete Guide With Chapters

▶︎
Revealing The SPECIAL TECHNIQUE Of A Pakistani Man To EXTRACT GOLD From Used Motherboard Waste

▶︎
Germans Couldn't Believe This "Invisible" Hunter — Until He Became Deadliest Night Ace

▶︎
AT&T Archives: A Modern Aladdin's Lamp, about vacuum tubes,1940

▶︎
MAKING A REPRODUCTION COSSOR TUBE

▶︎
MULLARD MADE FOR LIFE. Vintage Documentary

▶︎
How To Make Electron Tubes - P&C Electronics

▶︎
