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1 X 6F6G SYLVANIA TUBE. NEW OLD STOCK.
BRAND: SYLVANIA. 1950s PRODUCTION.
ROUND BLACK PLATES, COPPER RODS, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
95% EMISSION (EM) 92% TRANSCONDUCTANCE (GM) 0.0mA GAS