The devices measured the value of the tube's grid current.

When the drive is able to make the grid become positive the grid current will increase.

This can give rise to excessive screen grid current.

Even more grid current will be needed.

This design uses a triode, the grid current drawn in this system is larger than that required for the other two basic designs.

Gas and ions within the tube contribute to grid current which can disturb operation of a vacuum tube circuit.

This impedance will be determined by the grid current in Class C or AB2 operation.

High transconductance tubes develop significant grid currents even with small negative bias; in these cases, maximum instant voltage ceiling is lowered to -1.0.

Grid leak bias - diverting DC grid current through a high value grid resistor.

Grid currents can place extreme demands on the driving circuitry, sometimes requiring as much as 8 watts input for larger tubes such as the 211.

In particular he had replaced the calorimetric (thermal) detection of C. J. Gorter by a much more sensitive electronic technique of grid current.

In addition, the emissive cathode material on the grid causes a negative grid current (reverse electron flow from the grid to the cathode).

Some of these valves use aligned grids to minimise grid current and beam plates instead of a third grid, these are known as "beam tetrodes".

These designs take care of grid currents through the use of cathode followers or interstage transformers easing current load on the driver stages, and deep negative feedback to minimize distortion.

If the grid is allowed to go slightly positive (hence drawing grid current, adding more distortion, but giving slightly higher output power) on signal peaks the class is AB.

The screen grid current was about 5-10% of the anode (anode) current compared with about 20% for the pentode, thus the beam tetrode was more power-efficient.

One potential disadvantage of the grid leak detector is that the input impedance of the detector may be affected by the need to self bias the detector tube with grid current.

In this case the grid current is 8 A and the input impedance is thus 50 Ohm, which matches standard coaxial cables, and the Mosfet can thus placed remotely.

The maximum allowable negative control grid, g1 excursion allowable is -200 volts and average control grid current is 5mA in both A.M. and CW modes.

Amplitude distortion in a class A triode stage can be small if care is taken to prevent the anode current from becoming too small and ensuring that grid current does not flow at any point.

Amplifying devices may also have limits on their inputs, for example the maximum base current a bipolar transistor can take, and a vacuum tube may have problems with grid current if the input signal becomes too positive.

The principle of the DFIG is that rotor windings are connected to the grid via slip rings and back-to-back voltage source converter that controls both the rotor and the grid currents.

The positioning of the elements in a beam power tube uses a design called "critical-distance geometry", which minimizes the "tetrode kink", plate to control grid capacitance, screen grid current, and secondary emission from the anode, thus increasing power conversion efficiency.

Because the grid is negatively charged relative to both the anode and the screen grid, it repels any secondary electrons back to the anode preventing them from contributing to the screen grid current, and to any negative resistance characteristic.

Solid-state versions of the grid dip oscillator are sometimes called gate dip oscillators or emitter dip oscillators in reference to the parts of the semiconductor whose current is being measured instead of the grid current on a vacuum tube.