Excellent Pair of Sylvania 6SN7WGT. They are military spec brown based tubes. Test results on my calibrated TV7 tester for tube 1 are 90 & 95 and test results for tube 2 are 99 & 95 with the minimum (65%) being 50. Listening tested in amp for excessive noise and microphonics. Listened to the pair in our 300B amplifier; They are dead quiet when the amps are muted and sound wonderful when played. All tubes are guaranteed to test good when they arrive. Therefore for the next year I will list 100s of antique radios, audio tubes, tube amplifiers, radio parts, and radio tubes, so bookmark my username stonevintageradio and check in each week. For more information on radios, crystal sets, or tubes, as well as more radios or tubes for sale, visit my website StoneVintageRadio. This Agreement is governed by and interpreted under the laws of the state of Texas without exception.