Matched Pair Tung-Sol 6SD7 6SD7GT Vacuum Tubes NOS-Testing 6H6 Milspec They are dead quiet when

They are dead quiet when the preamp is muted and sound good even with 6

These three US-made 6BY5G tubes were tested on our Paul Hart-calibrated TV7/U for shorts

new in box 6JB5 / 6HE5 tubes tested to spec on our Paul Hart-calibrated TV7/U

This LP is in excellent shape with an occasional pop and tick

new in box US-made 6SH7 tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Tung-Sol 6SD7 6SD7GT Vacuum Tubes NOS-Testing 6H6 Milspec They are dead quiet whenThis new old stock testing matched pair of Tung Sol MANUFACTURED 6SD7GT pentodes was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 21 for Tube One (Emerson BRANDED) and 24 for Tube Two where minimum (65%) is 15 and 100% is 23. I am playing them in my Musical Paradise MC 3 single ended integrated amplifier as I write with Aimee Mann's seminal "Magnolia" album and it