Matched Pair Tung-Sol 6K6 6K6GT Vacuum Tubes Black Glass 12Q7 Octal respectively

respectively

This Sylvania milspec / industrial 5814 / 12AU7 / ECC82 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

This quintet of Tung-Sol number / type 27 triodes was tested on our TV7 for shorts

This lot of three new old stock

They have engraved / hot-stamped bases on is Champion-branded and the other is Zenith

Matched Pair Tung-Sol 6K6 6K6GT Vacuum Tubes Black Glass 12Q7 Octal respectivelyThis matched pair of Tung Sol black glass 6K6GT tubes was tested on our Maxi Matcher tube tester with 325 volts on the plates and a bias of 36 volts. Tube One drew 26. 6 milliamps' plate current while Tube Two drew 27. 6. Transconductance was 1900 for Tube One and 1800 for Tube Two where new nominal is within one standard deviation of 1900. As I write, I am playing them in my Mini Mite 2013 and they sound great. WE HAVE SCORES OF THOUSANDS OF VACUUM