Matched Pair General Electric GE 6K6 6K6GT Black Plate Vacuum Tubes Duodecar Japan These four US-made 7A7 tubes

These four US-made 7A7 tubes tested as follows on our Paul Hart-calibrated TV7/U where minimum (65%) is 44 and 100% is 68:

THAT IS ALL I CAN DO

There were no shorts or gas and they measured 52/52

new in box RCA 6BK7B tube tested to spec on our Paul Hart-calibrated TV7/U

steel support rods and excellent flashing

Matched Pair General Electric GE 6K6 6K6GT Black Plate Vacuum Tubes Duodecar Japan These four US-made 7A7 tubesThis 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. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE