7581A KT66 Tubes UOS UIB Good Used Vintage 1960's GE Matched Pair (last ones)

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*Auctions with no bids 12~24 hours before ending are relisted* .Very GOOD matched pair of used GE 7581A KT66 "OO" getter tubes from the 60's in original boxes.Matched within about 2% Gm (mutual conductance) and about 1% mA (current) between them. Auditioned in my amp to insure they perform well together and they sound great, very clean with a good bass and excellent bright detail. You can safely use these in amps that call for 7581, KT66 or 6L6GC tubes without any mods.We have other tubes, click here to see ==-> Debi's Vintage Electronics BoutiqueTube Number 7581A, KT66 (6L6GC) Brand on tube RCA, NationalActual Mfr GECountry of Mfr USADate code NP,Mfr's codes noneBox type original boxesPlate style GrayGetter style Double "OO" sideGlass style Clear bottlesTest results (typical NOS = 5000 Gm @ 45mA5100 Gm @ 47.5 mA 5000 Gm @ 47.0 mA