Electrodes inside each end of the glass tube are connected to a high-voltage source. 玻璃管两端内侧的电极与一个高压电源相接。
High voltage switch power supply supplies the high voltage for the electron gun, changing the density and brightness of ejected electrons. 高压电源给电子枪提供高压，改变发射出电子的密度以及亮度。
