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[[File:BD4 characteristic.png|thumb|400px|right|Characteristics of a [[BD4]] back diode]] | |||
The '''BD-4''', Tek part number 152-0070-00, is a 0.1 mA Germanium [[back diode]]. It is used in the HF-sync circuit of the [[7S14]] and trigger circuit of the late [[5T1A]]. | The '''BD-4''', Tek part number 152-0070-00, is a 0.1 mA Germanium [[back diode]]. It is used in the HF-sync circuit of the [[7S14]] and trigger circuit of the late [[5T1A]]. | ||