An operational amplifier, or differential amplifier, in a control loop that produces an error signal whenever a sensed output differs from a reference voltage. The output voltage of the error amplifier in a control loop. The process of returning part of the output signal of a system to the input of its control circuit. Field Effect Transistor. An electron gin with an extractor electrode which pulls or extracts electrons off the filament.
Extraction is accomplished using a high electric field.
An extractor supply is the opposite polarity of the beam supply and it floats on the beam supply. Electron emission from a surface due directly to high voltage gradients at the emitting surface. The current supplied to a filament to heat it. The voltage between the terminals of a filament. A hot cathode, usually in the form of a wire or ribbon, to which heat may be supplied by passing current through it.