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1 X 12AU7 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: RAYTHEON. 1960s PRODUCTION.
GREY PLATES, HALO GETTER, COPPER RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
97/91% EMISSION (EM)100/90 % TRANSCONDUCTANCE (GM) 2.0/1.8mA/V GAS