SCREEN GRINA grid placed between a control grid and the plate and usually maintained at a positive
SELF-BIASThe voltage developed by the flow of vacuum-tube current through a resistor in a grid or
SHARP-CUTOFF TUBEThe opposite of a remote-cutoff tube. An electron tube which has evenly
spaced grid wires. The amplification of the sharp-cutoff tube is limited by the bias voltage and
SPACE CHARGEAn electrical charge distributed throughout a volume or space.
TETRODE TUBEA four-electrode electron tube containing a plate, a cathode, a control grid, and a
THERMIONIC EMISSIONEmission of electrons from a solid body as a result of elevated
THYRATRON TUBEA gas-filled triode in which a sufficiently large positive pulse applied to the
control grid ionizes the gas and causes the tube to conduct, after which the control grid has no effect
TRANSCONDUCTANCEA measure of the change in plate current to a change in grid voltage with
the plate voltage held constant. Transconductance (gm) is usually expressed in micromhos or
TRANSIT TIMEThe time an electron takes to cross the distance between the cathode and the plate.
TRIODE TUBEA three-electrode electron tube containing a plate, a cathode, and a control grid.
VARIABLE-mu-TUBESame as remote-cut off tube.
VERTICAL DEFLECTION PLATESA pair of parallel electrodes in a CRT that moves the electron
beam up and down.
VOLTAGE GAINRatio of voltage across a specified load.