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The direct-current bias voltage that must be applied to the grid of an electron tube to stop the flow of anode current.



Related Terms

BLANK

  1. To cut off the electron beam of a television picture tube, camera tube, or cathode-ray oscilloscope tube during the process of retrace by applying a rectangular pulse voltage to the grid or cathode during each retrace interval. Also known as beam blank. 2. The result of the final cutting operation on a natural crystal.

BACK BIAS

  1. Degenerative or regenerative voltage which is fed back to circuits before its originating point; usually applied to a control anode of a tube or other device. 2. Voltage applied to a grid of a tube (or tubes) or electrode of another device to reduce a condition which has been upset by some external cause.

DISCHARGE TUBE

  1. An evacuated enclosure containing a gas at low pressure, through which current can flow when sufficient voltage is applied between metal electrodes in the tube. Also known as electric-discharge tube. 2. A tube through which steam and water are released into a boiler drum.

BOOTSTRAP CIRCUIT

A single-stage amplifier in which the output load is connected between the negative end of the anode supply and the cathode, while signal voltage is applied between grid and cathode; a change in grid voltage changes the input signal voltage with respect to ground by an amount equal to the output signal voltage.

INVERSE VOLTAGE

The voltage that exists across a rectifier tube or x-ray tube during the half cycle in which the anode is negative and current does not normally flow.

ANODE

  1. A positive electrode; the plate of a vacuum tube; the electrode of an electron tube through which a principal stream of electrons leaves the inter-electrode space. 2. The positive electrode of an electrochemical device, such as a primary or secondary cell, toward which the negative ions are drawn.

CUTOFF LIMITING

Limiting the maximum output voltage of a vacuum tube circuit by driving the grid beyond cutoff.

FORWARD BIAS

A bias voltage that is applied to a pn-junction in the direction that causes a large current flow; used in some semiconductor diode circuits.

DRAIN

  1. A channel which carries off surface water. 2. A pipe which carries off liquid sewage. 3. The region into which majority carriers flow in a field-effect transistor; it is comparable to the collector of a bipolar transistor and the anode of an electron tube.

ANODE CURRENT

The electron current flowing through an electron tube from the cathode to the anode. Also known as plate current.

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