Following are the different types of vacuum tubes and the elements used to control the flow of current. See vacuum tube. ----- VACUUM TUBES -----Triode Pentode Elements Diode Tetrode Cathode X X ...

Normally, vacuum tubes rely on a resistive heater to eject electrons from a conductive surface, which can involve large amounts of power, but both of these types ... 5V via a USB connection ...

We have occasionally featured vacuum tube computers here at Hackaday and ... The final touch is a VFD of the type used in bar graphs, were used to show the state of the various bits.