Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass Aufschwung March Transconductance measured 59 for both

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

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

36 and 48 where minimum (65%) is 29

Philco-BRANDED 14AF7 / XXD chrome dome dual triode tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass Aufschwung March Transconductance measured 59 for bothThis 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