Sylvania 5Y3 5Y3G Vacuum Tube Rectifier Black Plate ST Shoulder Shape 6AB7Y JAN-CRC-6AB7Y Fortunately they are inert and

Fortunately they are inert and don't affect the tubes's operation

two are industrial versions

Johnson porcelain

Brands are indicated on the boxes

This is an original recording from 1939 and it sounds 15-20 years ahead of its time

Sylvania 5Y3 5Y3G Vacuum Tube Rectifier Black Plate ST Shoulder Shape 6AB7Y JAN-CRC-6AB7Y Fortunately they are inert andThis 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 60 45 where minimum (65%) is 40 40 and 100% is 62 62. It has a nifty, old fashioned Coke bottle; dimple sheet getter, outstanding flashing and a TOR date code. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE