Pentagrid

pentagrid

[′pen·tə‚grid]
(electronics)

Pentagrid

 

a seven-electrode electron tube with five grids: two are control grids, two are screen grids, and one grid acts as an auxiliary anode. The pentagrid is similar to a heptode. Pentagrids were used between 1930 and 1950 mainly for frequency conversion in superheterodyne receivers.

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References in periodicals archive ?
In his work PC 24 (figure 5) one can see how the rhombic centre of the pentagrid is brought to life by the colouring of each element in either white or black.
In Pentagrid of 1994 (figure 9) such a fractal can be found.
With his pentagrids Caris creates a two-dimensional pentagonal universe.