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picture tube 
Hollow glass tube in which video signals are converted into electron beams to produce pictures on the screen.
screen
Surface on which pictures are formed; it is covered with sensitive dots, which emit red, green or blue light when hit by electrons.
color selection filter
Perforated metal plate that directs each electron beam toward the sensitive parts of the screen corresponding to its color.
protective window
Front portion of the picture tube that covers the screen.
electron beam
All the negatively charged particles traveling in the same direction; their intensity varies with the video signal received.
neck
Narrow part of the picture tube that contains the electron gun.
base
Terminal end of the picture tube that connects to outside circuits.
electron gun
Device that emits electron beams toward the screen; there are beams for each of the primary colors, red, green and blue.
funnel
Flared rear portion of the picture tube.
