6v6 5s2d 6v6gt cv508 tube Fivre Italy pair tubes power valve strong 1950's

2 tubes 6V6 Fivre made in Italy 

black plate

coated glass 

black base 

tested twice

test results with tube tester TV7 

tube 1 = 84 (reference good at 46) 

tube 2 = 84 (reference good at 46) 

Test with Tube tester Funke W19S, 

tube 1 = 38mA (reference good at 18mA) 

tube 2 = 39mA (reference good at 18mA) 

rare tubes strong emission 

box 175

pair 10