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2 X EF86 TUBE. USED.
BRAND: ADZAM. 1950s MULLARD PRODUCTION. B9C DATE CODES.
MESH PLATE, SQUARE GETTER.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
83% EMISSION (EM) 100% TRANSCONDUCTANCE (GM) 0.0mA/V GAS
106% EMISSION (EM) 105% TRANSCONDUCTANCE (GM) 0.1mA/V GAS
CH169U1