3T7
The Tektronix Type 3T7 is a sampling timebase and pulser plug-in for 560-series scopes. The 3T7 was introduced in 1971. Used with a 3S7, a TDR system is formed.
The pulse is produced by a 21 mA, 1.5 pF tunnel diode, CR587, made by GE with Tektronix part number 152-0489-00.
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