grid *
control grid

The control grid is usually wrapped around the anode, except a small opening on its top.

"Let me guess," said Kyle, from his position at the navigational control grid, "'no sign of unidentified base.'"

A valve can contain more than one control grid.

A variation of the control grid is to produce the helix with a variable pitch.

In the 1930s, tubes often had the connection to the control grid brought out through a metal top cap on the top of the tube.

If the input signal causes the control grid to become positive (where current flow begins), nonlinearity is to be expected.

The use of a pentode would seem an unlikely choice for a frequency converter because it only has one control grid.

In the off situation the voltage on the control grid is negative with respect to the cathode.

In this way, ignitrons also avoid the need for control grids.

It ran into a turbo-lift and must have hit the control grid.