Electrodes inside each end of the glass tube are connected to a high-voltage source. 玻璃管兩端內側的電極與一個高壓電源相接。
High voltage switch power supply supplies the high voltage for the electron gun, changing the density and brightness of ejected electrons. 高壓電源給電子槍提供高壓,改變發射出電子的密度以及亮度。