there are so many youngsters that have no idea what a vacuum tube is or what it does, and they don't know that if it wasn't for there invention our present day electronics would no be possible, so this is a tribute to vacuum tubes, i made a simulator showing how they work

put battery on the filament to turn the tube on, then spark the cathode and current will flow to the anode, if you spark the grid, the current will temporarily not be able to flow from the cathode to the anode. if a radio signal was put on the grid it would turn on and off to the music, then they would put power through the cathode and a more powerful radio signal would come out the anode, it would perfectly match the the signal put into the grid. hope you enjoy! :D