Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass Aufschwung March This LP sounds very good

This LP sounds very good

but as you can see

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

new in box RCA 7B6 tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass Aufschwung March This LP sounds very goodThis 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