New NL5557/FG17 High Sensitivity Thyratron High Frequency Machine Tube. GZ37 53KU GZ37 CV378 Mullard rectifier vacuum tube Ampltrex tested #729001. Amplitrex AT1000 Advance Digital Tube Tester, Hickok 752a tube tester, AVO Type 160.
Item Tag: NL-5557
NL-5557/FG-17/5557 Thyratron tube heavy duty dual getter US seller
5557 FG17 tube NL-5557/ 5557/FG17 tube (1) pc copy of the original GE thyratron rectifier tube, unique dual getter design for greater stability, heavy duty used in heat sealing and other industrial applications.