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RADIOACTIVE ELECTRON TUBES-Cont.
BEAM-POWER TUBES

Neets Module 06-Introduction to Electronic Emission, Tubes, and Power Supplies
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2-33 As you can see, the cleanup that results from breaking a radioactive tube is a long and complicated procedure. You can avoid this by simply ensuring that you don’t break the tube. CONVENTIONAL TUBES While conventional tubes present few safety problems, beyond broken glass and the possibility of cutting yourself, there is one precaution you must know. Namely, electron tubes are hot. The filaments of some tubes may operate at several thousand degrees. As a result, the envelopes can become very hot. When you work on electron tube equipment, always deenergize the equipment and allow the tubes sufficient time to cool before you remove them. If this is impossible, use special tube pullers which the Navy stocks for this purpose. Never attempt to remove a hot tube from its socket with your bare fingers. SUMMARY The following summary covers the main points of this chapter. Study it to be sure you understand the material before you begin the next chapter. MULTI-UNIT TUBES were developed to reduce the size of vacuum tube circuits. Incorporating more than one tube in the same envelope allowed the size of a vacuum tube circuit to be reduced considerably. While a single envelope may contain two or more tubes, these tubes are independent of each other. MULTI-ELECTRODE TUBES were developed to extend the capability of conventional tubes. In some cases, a multi-element tube may contain up to seven grids. These types of tubes are normally classified by the number of grids they contain. POWER PENTODES are used as current or power amplifiers. Power pentodes use in-line grid arrangements. In this manner, more electrons can reach the plate from the cathode. In effect, this lowers plate resistance and allows maximum conduction through the tube.






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