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Power diodes, unlike low-ampere rectifier diodes, which in turn contain a small amount of gold, which you still need to try to get, contain a large amount of pure silver, which does not require additional operations for its purification. The presented diode D151-125 can be compared with similar power thyristors, you can learn more about them here - • Pure silver power thyristors, as well as these power thyristors and diodes in addition to pure silver are made of a decent amount of copper and have inside a large in size and weight round tungsten or in some cases molybdenum nickel - • How to distinguish tungsten from molybdenum from ...