Figure 1-25.
Vacuum Tubes.
A special type of vacuum tube is the cathode-ray tube (CRT).
Unlike the other types of vacuum tubes, CRTs are still widely used.
They are the element known as the "picture tube" in your television
set.
They are used as the "screen" on radar displays and
CRTs have one feature that cannot be accomplished
with the use of other type tubes or transistors; they can convert
electrical signals to visual display.
Figure 1-27 shows the symbol
for a CRT.
Figure 1-26.
Triode Amplifier.
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