5Z3 tube Fivre Italy rectifier valve long plate silver smooth square getter WW2
1 tube 5z3 Fivre Italy power rectifier tube full wave
long smooth plate
grey plates
hanging filament
square getter bottom
black base
yellow label on glass
old production
Made in Italy
tested strong 44/45 on tube tester TV7D/U military tube tester instrument calibrated ( good at 40/40 )
box 161