Sylvania 5Y3 5Y3G Vacuum Tube Rectifier Black Plate ST Shoulder Shape 5E514 5E-514 I have played it in

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

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

Tube One (centering pin missing) measured 46/46 while Tube Two measured 50/46 where minimum (65%) is 25/25 and 100% is 39/39

please see Picture Four

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

Sylvania 5Y3 5Y3G Vacuum Tube Rectifier Black Plate ST Shoulder Shape 5E514 5E-514 I have played it inThis 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