Matched Pair Tung-Sol 6SD7 6SD7GT Vacuum Tubes NOS NIB Johann Sebastian Tube One measured 75/86 while

Tube One measured 75/86 while Tube Two measured 79/79 where minimum (65%) is 50/50 and 100% is 77/77

45 and 48 where minimum is (65%) is 36 and 100% is 55

new in box Amperex-BRANDED

This RCA 1C77G tube tested to spec on our Paul Hart-calibrated TV7/U

new in box Philco 12BA7 tubes tested to spec on our Paul Hart-calibrated TV7

Matched Pair Tung-Sol 6SD7 6SD7GT Vacuum Tubes NOS NIB Johann Sebastian Tube One measured 75/86 whileThis new old stock, new in box (For Tube One) matched pair of Tung Sol 6SD7GT pentodes was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 23 and 24 where minimum (65%) is 15. 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 sounds terrific. They have great bass and sparkling