Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass Aufschwung March new in box GE 12CX6

new in box GE 12CX6 tubes tested to spec on our Paul Hart-calibrated TV7/U

These three RCA large logo 6F5s were tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance measured 59 for both tubes where minimum (65%) is 40

but as you can see

Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass Aufschwung March new in box GE 12CX6This matched pair of Ken Rad 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 1970 micromhos, 29. 6 milliamps' plate current. Tube Two measured 1780 29. 9. New nominal is within one standard deviation of 1900. These tubes have copper support rods; rectangular mica spacers; black and silver bottles and