Matched Pair Sylvania 6SN7 6SN7GT Vacuum Tubes Black Ladder Plates 6680 an engraved base and terrific

an engraved base and terrific flashing

Transconductance (TV7/U): 54/51

new in box US-made 6CM6 tubes tested to spec on our Paul Hart-calibrated TV7/U

This GE 13V10 tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Sylvania 6SN7 6SN7GT Vacuum Tubes Black Ladder Plates 6680 an engraved base and terrificThis matched pair of Sylvania 6SN7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 50 60 for Tube One and 57 57 for Tube Two where minimum (65%) is 50 50 and 100% is approximately 77 77. These tubes have black ladder plates which are staggered to the right when viewed head on; coarsely crenelated mica spacers; copper support rods; dimple sheet