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2 X 4242A TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: MARCONI STC. 1940s PRODUCTION
GREY PLATES, RECTANGULAR GETTER, METAL CHROME BASE
MATCHED PAIR
TESTED IN AMPLITREX AT1000 TUBE TESTER
111% EMISSION (EM) 117% TRANSCONDUCTANCE (GM) 0.0mA GAS.
115% EMISSION (EM). 120% TRANSCONDUCTANCE (GM) 0.0mA GAS.