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2 X 5687 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: CHELMER. 1960s PRODUCTION.
BLACK PLATES, HALO GETTER, COPPER RODS, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
136/176% EMISSION (EM)
141/183% EMISSION (EM)