LESSON 5 - MULTIELEMENT TUBES
In each of the following exercises, select the ONE answer that
BEST completes the statement or answers the question. Indicate your
solution by circling the letter opposite the correct answer in the
The tetrode and pentode tube types often are used in place of
the triode at frequencies between the audio and microwave ranges. In
frequencies because the
secondary emission creates a negative resistance region in
the tube's transfer characteristic.
single control grid cannot withstand the high frequency plate
A fourth electrode, called the screen grid, exists in a tetrode,
which is not found in a triode. The purpose of the screen grid is to
act as an electrostatic shield between the control grid and
the plate, thus reducing Cgp .
supplement the controlling action of the control grid.
collect electrons that do not reach the plate.