Gas Thyratron
The PL21 Vacuum tube is a miniature type
gas-tetrode thyratron used in relay, grid-controlled
rectifier and pulse-modulator applications. It requires a
miniature 7-contact socket.
The 5727 Tube is the ruggedized version of 2D21 and
PL21.
Electrical Data:
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.6 A
Preferred Substitutes .............. 2D21, 2D21W,
5727