Matched Pair Sylvania 6SN7 6SN7GT Vacuum Tubes Black Ladder Plates 6680 Transconductance (TV7/U): 54/51

Transconductance (TV7/U): 54/51

new in box RCA 4BZ6 / 4JH6 tubes tested to spec on our Paul Hart-calibrated TV7/U

This pressing has very-light surface noise

5 record cleaner and then played it on my Rega Planar Three with an Ortofon X5-MC cartridge

It’s a good pressing of a 1954 performance from right on the cusp of mono high fi

Matched Pair Sylvania 6SN7 6SN7GT Vacuum Tubes Black Ladder Plates 6680 Transconductance (TV7/U): 54/51This 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