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5 X 6X4 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: SYLVANIA. 1960s PRODUCTION.
BLACK PLATES, SQUARE GETTER, QUINTET.
TESTED IN ROEHRENTEST TUBE TESTER:
101/94% 35.32/32.77mA EMISSION (EM)
86/85% 29.96/29.64mA EMISSION (EM)
87/86% 30.53/30.16mA EMISSION (EM)
88/107% 30.9/37.34mA EMISSION (EM)
108/88% 37.9/30.68mA EMISSION (EM)
