Thermionic Emission Experiment - Vacuum Tube Tester (3)

Part 3 of the "Vacuum Tube Tester" - Series. This time I perform some experiments to demonstrate the Edison / Edison-Guthrie-Effect (aka. as "Thermionic Emission"), on which vacuum tubes are based. I also show some methods to re-purpose magnetic moving coil instruments. Support my channel: Patreon:   / tpai   Paypal: https://www.paypal.com/cgi-bin/webscr...