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How can you tell if a diode is germanium?

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The general rule is that SILICON diodes have a voltage drop across the Anode to Cathode of 0.7 V (7/10 tenths), and the GERMANIUM diodes have a voltage drop of 0.3 V (3/10 tenths) more or less. Either diode voltage drop (silicon or germanium) will display a reading within approximately 5% of these readings.

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