(High Voltage, EHT) A large positive charge at the face plate of a CRT; in the order of 14,000 to 31,000 volts, is necessary to attract the electron beam from the neck of the picture tube to the front surface of the tube. There is a separate power supply in most CRT based viewing devices that supply this voltage. Large CRT's usually require higher voltages. High light outputs on any CRT requires more power from the high voltage supply than low light outputs. High voltage is also known as Extremely High Tension, EHT. VE T11.