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1 X ECC81 TUBE. UESD.
BRAND: MULLARD YELLOW. 1960s PRODUCTION.
GREY PLATES, HALO GETTER, COPPER RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
74/70% EMISSION (EM) 69/66% TRANSCONDUCTANCE (GM) 2.0/0.6mA/V GAS
CH168U1