Matched Pair General Electric GE 6K6 6K6GT Black Plate Vacuum Tubes December 28 2022 new in box Philco 12K7G

new in box Philco 12K7G tubes tested to spec on our Paul Hart-calibrated TV7/U

This trio of RCA 6K7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

These tubes have gray coatings from the very tops to within 12 MM of the bases

4 milliamps' plate current

I am playing it in my Musical Paradise MC-3 single-ended integrated amplifier with The Eagles' seminal "Hotel California" album and it sounds terrific

Matched Pair General Electric GE 6K6 6K6GT Black Plate Vacuum Tubes December 28 2022 new in box Philco 12K7GThis matched pair of GE 6K6 6K6GT tubes was 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 2000 micromhos, 24. 2 milliamps' plate current. Tube Two measured 2160 26. 6. New nominal is within one standard deviation of 1900. As I write, I am playing them in my Mini Mite 2013 and they sound great. WE HAVE SCORES OF