In a rotary anode type X-ray tube, a rotary anode and a rotary structure supporting the anode are arranged within the vacuum envelope. The assembly has an inner pole and an outer pole as well as a coil. The apparatus also includes an attachment for a magnet, and another magnet provided with the attachment and disposed on a side of the attachment such that the pivot axis is between the magnet and the clip arms, and a clip holding block configured to be secured onto a star and facing the clip and having a magnet. The voltage divider circuit includes a common node connected to the control end, one end of the voltage divider circuit connected between the first conducting end and the power input pin, and the other end of the voltage divider circuit connected to ground. Precision programming is useful for multilevel digital and analog information storage.