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2 X 717A TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: WESTERN ELECTRIC. 1950s PRODUCTION.
BLACK PLATES, SOLID GETTER, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
100% EMISSION (EM) 86% TRANSCONDUCTANCE (GM) 0.3mA/V GAS
104% EMISSION (EM) 100% TRANSCONDUCTANCE (GM) 0.2mA/V GAS