2 tubes 6L6G Raytheon made in USA

same code J1M 280 339

black plate 

same inner structure 

copper rods 

black base 

tested twice

test results with tube tester TV7 

tube 1 = 46 (reference good at 46) 

tube 2 = 46 (reference good at 46) 

Test with Tube tester Funke W19S

tube 1 = 90mA (reference good at 18mA) 

tube 2 = 86mA (reference good at 18mA) 

rare tubes strong emission 

box 180

pair 7