RESONATOR 



FLEXIBLE 

 DIAPHRAGM 



TUNER SCREW 



TUNER BOW 



REPELLER 

 CAVITY GRIDS 



ACCELERATING 

 GRID 



BEAM-FORMING 

 ELECTRODE 



_ TUNER 

 BACK STRUT 



COAXIAL 

 OUTPUT LEAD 



Fig. 63. — A 3 centimeter reflex oscillator with an internal resonator. This tube is a 

 further development of the earliest internal resonator reflex oscillator designed at the Bell 

 Telephone Laboratories. 



561 



