6550a 6550 GE tube quad metal base triple getter JAN mil specs power tubes 

4 tubes 6550a GE JAN mil specs  code 85-44 33173 

tested on Tube tester TV7D/U 

test results = 60 ; 60 ; 54 , 54  (reference good 48) 

tested also on tube tester Funke W19S 

test results = 50mA ; 50mA ; 50mA ; 48mA 

4 tubes = 4 valves = 4 pieces with box 

box 165