152-0489-00
The 152-0489-00 is a 21 mA, 1.5 pF tunnel diode made by General Electric. It is used in the 1502 and 3T7. In the 1502, it is CR1703 and the description in the parts list is "SMTD0892 w/ clamp".
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152-0489-00 as CR587 in 3T7 pulser
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152-0489-00 as CR1703 in 1502 pulse generator