Matched Pair Sylvania 6SN7 6SN7GT Vacuum Tubes Black Ladder Plates 6680 new in box RCA 4BZ6

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

IF IT'S NOT LISTED

but were fine at all volume levels in the MP-301

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

Transconductance (TV7/U): 54/51

Matched Pair Sylvania 6SN7 6SN7GT Vacuum Tubes Black Ladder Plates 6680 new in box RCA 4BZ6This 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