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1 X 5963 TUBE. NEW OLD STOCK.
BRAND: SYLVANIA. 1960s PRODUCTION.
GREY PLATES, SQUARE GETTER, COPPER RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
117/123% EMISSION (EM) 109/118% TRANSCONDUCTANCE (GM) 0.0/1.0mA GAS