This new old stock-testing matched pair of Telefunken 12AU7 / ECC82 tubes tested at 2450/2500 and 2500/2550 micromhos on a Hickok 600A tester. Minimum is 1430. New is within half a standard deviation of 2200. These tubes have poor silkscreening and, of course, the Telefunken diamond in their bases. I also listened to them in my MC240 and they sound excellent with no noise, hiss or other artifacts. Shipping is First Class with tracking in the US ,Canada and International. |