Matched Pair Tung-Sol 6SD7 6SD7GT Vacuum Tubes NOS NIB Johann Sebastian This RCA 1C77G tube tested

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

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

5 record cleaner and then played it on Rega Planar Three

Admiral-BRANDED 5V4G rectifier tube was tested on our Paul Hart-calibrated TV7/U

Matched Pair Tung-Sol 6SD7 6SD7GT Vacuum Tubes NOS NIB Johann Sebastian This RCA 1C77G tube testedThis 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