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The TD253 is a 10mA germanium [[tunnel diodes|tunnel diode]]. | The TD253 is a 10mA germanium [[tunnel diodes|tunnel diode]] from General Electric. | ||
It is used in several Tektronix instruments, including the [[547]]. | It is used in several Tektronix instruments, including the [[547]]. | ||
It is specified to have a maximum capacitance of 9pF. | It is specified to have a maximum capacitance of 9pF. |