This ripple is due to incomplete suppression of the alternating waveform after rectification. Bridge rectification has a loss of two diode drops. A device with two active elements is a diode, usually used for rectification. Pulsed DC may also be generated for purposes other than rectification. Originally, the only use for tubes in radio circuits was for rectification, not amplification. Thus the third principle of rectification is needed. It also provides data to enable the scheduling of both rectification and preventive maintenance. Likewise, the cantitruncation can be viewed as the truncation of the rectification. Rather, it is concerned with the process of individual Tikkun (Rectification) of the soul. This process is called image rectification. The sefirot now harmonise, to enable the Lurianic scheme of Tikkun (Rectification) to begin. There is in addition, active rectification which uses transistors. This section provides external links to reference implementations of image rectification. Both used vacuum tubes for preamplification, rectification, and output. Ignoring scaling, expansion can also be viewed the rectification of the rectification.