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<p>be made from a klystron tube, by providing a <a href="page.php?w=feedback">feedback</a> path from output to input by connecting the "catcher" and "buncher" cavities with a <a href="page.php?w=coaxial_cable">coaxial cable</a> or <a href="page.php?w=waveguide_%28electromagnetism%29">waveguide</a>. When the device is turned on, <a href="page.php?w=electronic_noise">electronic noise</a> in the cavity is amplified by the tube and fed back from the output catcher to the buncher cavity to be amplified again. Because of the high <a href="page.php?w=Q_factor">Q</a></p><p>
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