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2 X 311A TUBE. NEW OLD STOCK IN ORIGINAL SPANISH AIRFORCE BOX.
BRANDS: WESTERN ELECTRIC
BLACK PLATES, SQUARE GETTER, LOGO ON TOP
VERY RARE AND HIGH QUALITY
MATCHED PAIR
TESTED IN ROEHRENTEST TUBE TESTER:
72% 23.65mA EMISSION (EM)
70% 23.17mA EMISSION (EM)