How to Know Vacuum Tubes

Vacuum tubes are the first steps and device that man created to harness electric circuitry towards what gradually became known as electronics. Vacuum tubes are also called valves. Gradually semiconductor devices phased out the valves. producers of valves did their best to miniaturized their products to the ultimate. Even at the start of space explorations and travel to moon many onboard equipment on space ships that now are manufactured with solid-state electronics, contained circuitries built with vacuum tubes.

No one can deny the vast usage of vacuum tubes in present electronics from music amplifiers to satellites and earth radio stations.

Steps

1. Note that each electronic valve needs a circuitry to make the device warm and ready. This is called heater or filament element.
2. Know what is a diode valve. Job of a diode valve is to rectify an alternating current. In modern electronics it is substituted with a semiconductor diode. It has three parts.
   1. Heater
   2. Cathode
   3. Anode
   4. It is set inside a glass tube which is vacuumed of air.