Circuits and methods for protecting thyristors in a bridge configuration are provided. Improved pressure regulating features include a double acting baffle and preferably a relief valve. The invention further relates to methods for producing a corn plant containing in its genetic material one or more transgenes and to the transgenic plants produced by that method and to methods for producing other inbred corn lines derived from the inbred BX20010. The method includes transferring transmission fluid to the first clutch and transferring transmission fluid to the second clutch after the determined time lapse has passed since the first clutch started to be filled.