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1 X ECC83 TUBE. USED.
BRAND: VALVO. 1960s MULLARD PRODUCTION. B-CODES.
GREY PLATES, HALO GETTER.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
75/91% EMISSION (EM) 81/81% TRANSCONDUCTANCE (GM) 0.2/0.0mA GAS