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Additional resources for Introduction to Electronic Emission, Tubes, and Power Supplies

Example text

The base must be mechanically strong and made of an insulating material to prevent the tube elements from shorting. Because they require relatively frequent replacement, most tubes are designed to plug into sockets permanently mounted in the equipment. Tube pins and sockets are so designed that tubes cannot be plugged in incorrectly. Tube sockets must make secure mechanical and electrical contact with tube pins, must insulate pins from each other, and must provide terminals to which circuit components and conductors are connected.

1-16 You should note that there is very little difference in plate resistance when the Ep and Ip values are taken from the linear portions of curves. Check this out with values taken from the linear portion of figure 1-13. Rp (with a capital R) is the effective resistance offered to direct current. —Gas diodes are a type of tube that we have not yet discussed. They are mentioned here only because of their plate-resistance characteristic. Instead of a high-vacuum environment, some tubes have small amounts of gas introduced in the envelope vacuum during manufacture.

When current flows through this resistance, a voltage drop occurs. The result is that one side of the resistance, or filament, is more negative than the other side. The negative side of the filament will emit more electrons than the positive side; which, again, is less efficient than if the filament has equal emission across its entire surface. When ac is the source of filament power, it causes a small increase and decrease of temperature as it rises and falls. This causes a small increase and decrease of emitted electrons.

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