5642 NOS
High-voltage subminiature diode used for Oscilloscope CRT (Rectifier) Base Sm-2Y1. 10KV PIV, 0.250mA max dc, steady state, 150uA typical.
Also made by GE, Mullard, Sylvania, Tung-Sol, Westinghouse among the others.
Tube tests as new. It ships in its original box.
This tube is sold individually. Photo is of a sample from the lot.