Matched Pair Tung-Sol 6K6 6K6GT Vacuum Tubes Black Glass Philco 1D8 1D8GT and as I test new-in-box

and as I test new-in-box 5963s

new in box GE 6BD6 tubes tested to spec on our Paul Hart-calibrated TV7/U

It sounds fine with an occasional pop and tick

Converter 12BE6

This new old stock-testing RCA 6680 / 12AU7A / ECC82 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair Tung-Sol 6K6 6K6GT Vacuum Tubes Black Glass Philco 1D8 1D8GT and as I test new-in-boxThis 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