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2 X EF86 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: NATIONAL. 1970s RUSSIAN PRODUCTION.
MESH PLATE, INVERTED CUP GETTER, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
106% EMISSION (EM) 110% TRANSCONDUCTANCE (GM) 0.0mA GAS
110% EMISSION (EM) 111% TRANSCONDUCTANCE (GM) 0.1mA GAS