4 Sylvania 6K6 6K6GT Chrome Dome / Silver Top Vacuum Tubes Lot Of Four XM 30077 LP excellent flashing and 280 652

excellent flashing and 280 652 factory/date codes

new in box Tung-Sol 6DE7 tube tested to spec on our Paul Hart-calibrated TV7/U

an O-getter

5 record cleaner and then played on our Rega Planar 3

4 Sylvania 6K6 6K6GT Chrome Dome / Silver Top Vacuum Tubes Lot Of Four XM 30077 LP excellent flashing and 280 652This lot of four Sylvania chrome dome 6K6GT tubes were tested on our Maxi Matcher 2 with 325 volts on the plates and a bias of 36 volts for shorts, gas, plate current and transconductance. There were no shorts or gas. Tube One measured 1260 micromhos and drew 13. 6 milliamps' plate current. Tubes Two through Four measured 1480 14. 8, 1590 18. 8 and 1930 23, respectively. New nominal is within one standard deviation of 1900. Most 6K6s are rather anemic