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1 X 6186 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: HEINTZ AND KAUFMAN. 1960s PRODUCTION.
GREY PLATES, HALO GETTER.
TESTED IN FUNKE W20 TUBE TESTER:
MINIMUM GOOD EMISSION = 60% = 6mA
ALL TUBE TESTED ARE OVER 9.9mA