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2 X EC81 VALVO TUBE. NEW OLD STOCK.
BRAND: VALVO. 1960s PHILIPS PRODUCTION
GREY PLATES, HALO GETTER, GOLD PIN, COPPER RODS, MATCHED PAIR.
TESTED IN FUNKE W20 TUBE TESTER:
MINIMUM GOOD EMISSION = 60% = 10mA
17mA EMISSION (EM)
17mA EMISSION (EM)