In the past 3 years, an experiment diode tube and 2 prototype tubes were manufactured at BVERI. The beam voltage of the diode tube achieves 454kV and the perveance is 0.67 μP. The first prototype is being tested, and the second is prepared to change the electron gun because sometimes its filament is partly short. With the testing of the first prototype, its frequency is mistuned from 11.402GHz to 11.384GHz due to low transmission—96%. while the peak output power achieves 36MW with 420kV beam voltage at 11.384GHz.