Matched Pair Tung-Sol 6SD7 6SD7GT Vacuum Tubes NOS NIB Les Dernieres 53/53 where minimum (65%) is

53/53 where minimum (65%) is 40/40 and 100% is 62/62

This lot of four RCA black plate

It will also be also -- as time becomes available -- on our Paul Hart-calibrated TV7/U for a more-familiar point of reference for most

3/2470 for Tube Two

They have 4-48 188-5 and 4-43 188-20 date/factory codes

Matched Pair Tung-Sol 6SD7 6SD7GT Vacuum Tubes NOS NIB Les Dernieres 53/53 where minimum (65%) isThis new old stock, new in box (for Tube Two) 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 26 for Tube One (Philco BRANDED) and 27 for Tube Two (RCA BRANDED) 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