4 tubes E80F Philips SQ Special quality gold pins  △ code 

made in the Netherlands for postal service long life tube 10.000 hours life time reliability 

tested on tube tester Funke W19S 

test results = 4,5mA  ; 4,5mA ; 4,5mA ; 4,4mA (reference good at 2,4mA) 

reference 100% = 3mA 

all 4 tubes with strong emission 

box 167

quad 2