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PLANAR TUBES
ANSWERS TO QUESTIONS Q1. THROUGH Q18. - 14178_106

Neets Module 06-Introduction to Electronic Emission, Tubes, and Power Supplies
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2-37 COLD-CATHODE TUBES lack heaters or filaments and, therefore, do not use thermionic emission. Instead, a voltage potential applied across the tube causes the internal gas to ionize. Once ionization has occurred, the voltage drop across the tube remains constant, regardless of increased conduction. The CRT is a special-purpose tube that has the unique ability to visually display electronic signals. The CRT uses the principles of electrostatic attraction, repulsion, and fluorescence. Because of its unique ability, the CRT makes up the heart of many types of test equipment that you will become familiar with during your career in electronics.






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