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2 X KT63 TUBE. NEW OLD STOCK.
BRAND: MARCONI. 1960s PRODUCTION.
GREY PLATES, INVERTED CUP GETTER, MATCHED PAIR.
SOME TUBES HAVE “CLINC BASE”, LEFT TUBE HAS SOME MATERIAL LOOSE INSIDE THE BASE, ALTHOUGH THE BASE IS SECURELY GLUED, IT MAKES NOISE WHEN YOU SHAKE THE TUBE. THIS DOES NOT AFFECT ITS FUNCTIONALITY.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
99% EMISSION (EM) 116% TRANSCONDUCTANCE (GM) 0.5mA GAS
105% EMISSION (EM) 113% TRANSCONDUCTANCE (GM) 0.6mA GAS