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2 X EF86 TUBE. USED.
BRAND: MULLARD. 1950s PRODUCTION. B9F DATE CODES.
MESH PLATE, RECTANGULAR GETTER, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
93% EMISSION (EM) 116% TRANSCONDUCTANCE (GM) 0.0mA/V GAS
93% EMISSION (EM) 116% TRANSCONDUCTANCE (GM) 1.3mA/V GAS
CH169U1