Tung-Sol 6SD7 6SD7GT Vacuum Tube NOS NIB A M Records This trio of RCA 6K7

This trio of RCA 6K7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

It measured an almost- perfectly-balanced 76/77 where minimum (65%) is 56/56

new in box RCA 36MC6 / 36MC6A tubes tested to spec on our Paul Hart-calibrated TV7/U

Its diodes measured 57 and 54

I am playing it my Musical Paradise MC-3 single-ended integrated amplifier as I write with Aimee Mann's seminal "Magnolia" album and it sounds terrific

Tung-Sol 6SD7 6SD7GT Vacuum Tube NOS NIB A M Records This trio of RCA 6K7This new old stock, new in box Tung Sol 6SD7GT pentode tested to spec on our Paul Hart calibrated TV7 U. I am playing it my Musical Paradise MC 3 single ended integrated amplifier as I write with Aimee Mann's seminal "Magnolia" album and it sounds terrific. This tube has great bass and sparkling highs and Mann's voice is warm and clear as a bell. It is a bit microphonic, but this was no issue with the amp at full volume and when actuating the amp's