Matched Pair RCA 6K6 6K6GT Vacuum Tubes Valves October 17 2025 I have played it in

I have played it in one of my Radio Craftsman RC-2 monoblocks and it sounds outstanding

These tubes have acid-etched codes and designations as well as silk-screened 68-26 188-5 67-50 production run/provenance codes

Transconductance measured micromhos with a plate current draw of milliamps

They measured 90/82 for Tube One and 91/84 for Tube Two where minimum (65%) is 57/57

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Matched Pair RCA 6K6 6K6GT Vacuum Tubes Valves October 17 2025 I have played it inThis matched pair of RCA MANUFACTURED 6K6GT tubes was tested on our Maxi Matcher 400 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Tube One drew 21. 6 milliamps' plate current and measured 1610 micromhos. Tube Two measured 25 1860. New nominal is within one standard deviation of 1900. These tubes have black plates; copper support rods; rectangular mica spacers and gapped D getters. As I