BD1
The BD-1 is a 1 mA (@90 mV) Germanium back diode. It has a specified rise time of 1 ps.
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BD1 I-V curve in AC mode on 576. The center point on the CRT is (0V, 0mA).
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GE back diodes
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BD1 to BD7 back diode data from 1977 GE semiconductor data book