LESSON 1
DEFINE BASIC CIRCUIT THEORIES OF COLOR VIDEO CAMERAS
TASK
Describe theory and terminology of camera pickup tubes, preamplifiers, and video
CONDITIONS
Given information and illustrations about terms relating to television studio
equipment cameras, describing the theories of pickup tubes, preamplifier and video
amplifier.
STANDARDS
Demonstrate competency of the task skills and knowledges by responding to the
multiplechoice test covering theory and terminology of the basic circuits of a
color studio camera.
REFERENCES
None
Learning Event 1:
DESCRIBE THE THEORY OF A PICKUP TUBE
1. Color video cameras are basically alike in many ways: they all have pickup
tubes, preamplification, video amplification, camera cable, DC power, AC power, and
NOTE: Color video cameras basically take an image of light
and convert it into electronic information.
2. The common characteristic of all pickup tubes is conversion of light images
into electronic reproduction of those images. The most commonly used pickup tube
3. The plumbicon tube is a photoconductive device. This means it conducts when
the face is struck by light: in reverse, when the photoconductive layer is not
struck by light, then the photoconductive layer will not conduct (fig 11 foldout
located at the end of Lesson 3). The electron beam is obtained from the cathode of
the pickup tube. As voltage is applied to the heater the cathode emits free
electrons.
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