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2 X 6F6G TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: SYLVANIA. 1940s PRODUCTION.
BLACK ROUND PLATES, FLAT GETTER, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER
100% EMISSION (EM) 100% TRANSCONDUCTANCE (GM) 5.3mA GAS
99% EMISSION (EM) 101% TRANSCONDUCTANCE (GM) 1.4mA GAS