lesson five
multielement tubes
INTRODUCTION
Early in the history of tube development and application, tubes
were designed for general service.
That is, one type of tube, the
triode, was used for many varied applications.
Obviously, this one
tube could not meet every possible requirement and do it effectively.
Present trends in tube design are the development of "specialty"
type tubes.
These tubes are designed either to give optimum
performance in a particular application; or to combine in one vacuum
envelope functions which required two or more tubes.
The construction and theory of operation
of
these
multi-
electrode tubes will be discussed in this lesson.
TEXT ASSIGNMENT
TM 11-662, chapter 5, paragraphs 60-74
RESOURCE REQUIREMENTS
Signal Subcourse SS0311
LESSON OBJECTIVES
When you have completed this lesson you should:
1.
Know the function of the screen grids and the effects they have
on the tetrode and pentode tubes.
2.
Be able to explain the function of the suppressor grid and the
effects of its secondary emission in pentode tubes.
3.
Know the theory and application of beam power tubes.
4.
Know the function of the different types of multigrid tubes.
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