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2 X 12AT7 / ECC81 TUBE. USED.
BRAND: MULLARD. 1950s PRODUCTION. Tk1 B8E DATE CODES.
GREY PLATES, RECTANGULAR GETTER, COPPER RODS.
BOTH TUBES HAVE THE SAME DATE CODES.
TESTED IN ROEHRENTEST TUBE TESTER:
77/631% 7.807/6.334mA EMISSION (EM)
95/79% 9.541/7.972mA EMISSION (EM)
CH169U1