5Z3 tube Fivre Italy power rectifier tubes black long plate silver foil getter
one tube 5z3 Fivre tested on tube tester Funke W19S =95mA & 80mA (reference good at 80mA & 80mA)
ONE TUBE TYPE 5Z3 FIVRE MADE IN ITALY
OLDEST PRODUCTION
LONG BLACK SMOOTH RUGGED PLATE
HANGING FILAMENT
PAN GETTER
BLACK BASE
OLD LABELS RED AND YELLOW
box 158