4 Ken-Rad 6K6 6K6GT Vacuum Tubes Valves Black Glass Lot Of Four December 25 2024 Transconductance measured 48 for Tube

Transconductance measured 48 for Tube One and 50 for Tube Two where minimum (65%) is 40 and 100% is 62

They measured 39

This matched trio of RCA 5Z4 rectifier tubes were tested on our Paul Hart-calibrated TV7/U for shorts

a fence-like strip on top of the top spacer and dimpled sheet getters

O getter and an 805 ACP date / provenance code

4 Ken-Rad 6K6 6K6GT Vacuum Tubes Valves Black Glass Lot Of Four December 25 2024 Transconductance measured 48 for TubeThese Ken Rad MANUFACTURED, OEM BRANDED black glass 6K6GT tubes were tested on our Maxi Matcher tube tester with 325 volts on the plates and a bias of 36 volts and tested as follows: Tube One: 20 milliamps' plate current, 1480 micromhos' transconductance; Tube Two: 21. 9 1700; Tube Three: 23. 9 1730 and Tube Four: 34 2240 where new nominal is within one standard deviation of 1900. Sorry I cannot say how they sound, but I have not been able to find a