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2 X 6R4 / EC81 AMPEREX TUBE. NEW OLD STOCK.
BRAND: AMPEREX. 1960s PHILIPS PRODUCTION.
GREY PLATES, HALO GETTER, COPPER RODS, GOLD PIN, PQ: PREMIUM QUALITY, MATCHED PAIR.
TESTED IN FUNKE W20 TUBE TESTER:
MINIMUM GOOD EMISSION = 60% = 10mA
16mA EMISSION (EM)
16mA EMISSION (EM)