Embodiments of circuits and systems for a harmonic tuning network coupled with a radio frequency push-pull power amplifier to terminate both second- and third-harmonic energies are disclosed. A charge unit charges a surface of an organic photo conductor to a predetermined electric potential. When the patient has gained confidence in the pain free use of the dilator, the balloon is deflated to remove the air and water is introduced into the balloon to expand it so that it contacts the vaginal canal and exerts a pressure thereon. , a supporting member fitted to the vibrator. Further, the above structure improves accuracy in the assembly process of the electron gun, thereby improving the yield factor.