Matched Pair Sylvania 6K6 6K6GT Vacuum Tubes Silver Tops NOS-Testing 1st Quarter BW16 new in box Philco 7R7

new in box Philco 7R7 tube tested to spec on our Paul Hart-calibrated TV7/U

a slant D getter

on our Paul Hart-calibrated TV7/U where minimum (65%) is 31 and 100% is 48

This matched pair of RCA 5U4GB rectifier tubes was tested on our Paul Hart-calibrated tube tester for shorts

Transconductance measured 38 where minimum (65%) is 25

Matched Pair Sylvania 6K6 6K6GT Vacuum Tubes Silver Tops NOS-Testing 1st Quarter BW16 new in box Philco 7R7This matched pair of Sylvania silver top 6K6GT tubes was tested on our Maxi Matcher tube tester with 325 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 1720 micromhos and drew 18. 8 milliamps' plate current. Tube Two measured 1690 20 where new nominal is within one standard deviation of 1900. These 6K6s are the best looking, most solidly built 6K6s I've ever seen! They