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



Related Terms

COMPARATOR CIRCUIT

An electronic circuit that produces an output voltage or current whenever two input levels simultaneously satisfy predetermined amplitude requirements; may be linear (continuous) or digital (discrete).

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.

DIFFERENTIAL FREQUENCY METER

A circuit that converts the absolute frequency difference between two input signals to a linearly proportional direct-current output voltage that can be used to drive a meter, recorder, oscilloscope, or other device.

NOR CIRCUIT

A circuit in which output voltage appears only when signal is absent from all of its input terminals.

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.

GROUNDED-GRID AMPLIFIER

An electrontube amplifier circuit in which the control grid is at ground potential at the operating frequency; the input signal is applied between cathode and ground, and the output load is connected between anode and ground.

OSCILLATORY CIRCUIT

Circuit containing inductance or capacitance, or both, and resistance, connected so that a voltage impulse will produce an output current which periodically reverses or oscillates.

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.

PHASE SPLITTER

A circuit that takes a single input alternating voltage and produces two or more output alternating voltages that differ in phase from one another.

CUTOFF BIAS

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

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