5y3 tube U50 type rectifier FIVRE ITALY valve black vintage 5y3g r52 ~ UX280 CX380

Original vintage old production Fivre made in Italy big red and yellow label 

hanging filament 

grey plate smooth plate anode 

internal welded 

square getter welded bottom 

big brown base 

Coke Bottle long Neck 

St shape

tested strong  50/45 on tube tester TV7D/U military tube tester instrument calibrated ( good at 40/40 ) 

great tube full wave vintage vacuum rectifier for tube amplifier with 45 / 50 tubes in the last stage audio

box 157