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Rectifier.
An example of the element Selenium

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Selenium Rectifier
Rectifier.
Before the invention of silicon and germanium rectifiers, selenium was used to convert AC to DC. It worked only marginally well compared to modern silicon components.
Source: eBay seller radiocorner
Contributor: Theodore Gray
Acquired: 25 November, 2003
Price: $10/24
Size: 2"
Purity: >90%
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