Sylvania 5Y3 5Y3G Vacuum Tube Rectifier Black Plate ST Shoulder Shape 5E514 5E-514 The two on the left

The two on the left have black plates while the one on the right’s plates are gray

I have played it in my Alan Eaton single-ended 45 amplifier with an adapter and it sounds outstanding

These five Ken-Rad-MANUFACTURED 6U7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

It sounds fair to middlin' with many pops and ticks

new in box black plate Sylvania 6BK7A tube tested to spec on our Paul Hart-calibrated TV7/U

Sylvania 5Y3 5Y3G Vacuum Tube Rectifier Black Plate ST Shoulder Shape 5E514 5E-514 The two on the leftThis black plate Sylvania 5Y3G rectifier tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 53 58 where minimum (65%) is 40 40 and 100% is 62 62. It has a nifty, old fashioned Coke bottle; a D getter, outstanding flashing; a wire snubber for increased rigidity and an MR Z5R date code. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE