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1 X EL37 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: MULLARD. 1960s PRODUCTION. B-CODES.
BLACK PLATES, DUAL HALO GETTER, COPPER RODS.
TESTED IN ROEHRENTEST TUBE TESTER:
91% 91.26mA EMISSION (EM) 10.5mA/V TRANSCONDUCTANCE (GM)