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2 X 6F8G TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: SYLVANIA. 1950s PRODUCTION.
BLACK PLATES, MATCHED PAIR.
TESTED IN ROEHRENTEST TUBE TESTER:
103/86% EMISSION (EM) 107/100% TRANSCONDUCTANCE (GM) 1.4/1.2mA/V GAS
93/102% EMISSION (EM) 103/111% TRANSCONDUCTANCE (GM) 0.4/1.0mA/V GAS