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2 X EF86 TUBE. USED.
BRAND: ADZAM / MULLARD. 1950s MULLARD PRODUCTION. B7F DATE CODES.
MESH PLATES, RECTANGULAR GETTER, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
110% EMISSION (EM) 116% TRANSCONDUCTANCE (GM) 0.1mA/V GAS
163% EMISSION (EM) 88% TRANSCONDUCTANCE (GM) 0.0mA/V GAS
CH169U1